From 2d7bd8a040ed9e475dc0fef51aa168232093abf9 Mon Sep 17 00:00:00 2001 From: qiancai Date: Wed, 15 Oct 2025 15:13:23 +0800 Subject: [PATCH 01/55] Create release-8.5.4.md --- releases/release-8.5.4.md | 131 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 131 insertions(+) create mode 100644 releases/release-8.5.4.md diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md new file mode 100644 index 0000000000000..30747d8ddd1c8 --- /dev/null +++ b/releases/release-8.5.4.md @@ -0,0 +1,131 @@ +--- +title: TiDB 8.5.4 Release Notes +summary: Learn about the compatibility changes, improvements, and bug fixes in TiDB 8.5.4. +--- + +# TiDB 8.5.4 Release Notes + +Release date: August 14, 2025 + +TiDB version: 8.5.4 + +Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with-tidb) | [Production deployment](https://docs.pingcap.com/tidb/v8.5/production-deployment-using-tiup) + +## Compatibility changes + +- note [#issue](https://github.com/pingcap/${repo-name}/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) +- (dup): release-7.5.7.md > 兼容性变更 - TiKV 废弃以下配置项，并由新的 [`gc.auto-compaction`](https://docs.pingcap.com/zh/tidb/v7.5/tikv-configuration-file/#gcauto-compaction) 配置项替代，用于控制自动 compaction 行为 [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) + +## Improvements + ++ TiDB + + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - (dup): release-9.0.0.md(beta.1) > # SQL 功能 * 支持对分区表的非唯一列创建全局索引 [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) + - (dup): release-9.0.0.md(beta.1) > 改进提升> TiDB - 支持由 `IN` 子查询而来的 Semi Join 使用 `semi_join_rewrite` 的 Hint [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) + ++ TiKV + + - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - (dup): release-7.5.7.md > 改进提升> TiKV - 优化在存在大量 SST 文件的环境中 async snapshot 和 write 的尾延迟 [#18743](https://github.com/tikv/tikv/issues/18743) @[Connor1996](https://github.com/Connor1996) + ++ PD + + - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - (dup): release-7.5.7.md > 改进提升> PD - 减少非必要的错误日志 [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + ++ TiFlash + + - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + ++ Tools + + + Backup & Restore (BR) + + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + + + TiCDC + + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + + + TiDB Data Migration (DM) + + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + + + TiDB Lightning + + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + + + Dumpling + + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + + + TiUP + + - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + +## Bug fixes + ++ TiDB + + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - (dup): release-7.5.7.md > 错误修复> TiDB - 修复估算跨月或跨年的行数时，结果可能过分偏大的问题 [#50080](https://github.com/pingcap/tidb/issues/50080) @[terry1purcell](https://github.com/terry1purcell) + ++ TiKV + + - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + ++ PD + + - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - (dup): release-9.0.0.md(beta.1) > 错误修复> PD - 修复 PD Client 重试策略没有正确初始化的问题 [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) + ++ TiFlash + + - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + ++ Tools + + + Backup & Restore (BR) + + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + + + TiCDC + + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + + + TiDB Data Migration (DM) + + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + + + TiDB Lightning + + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + + + Dumpling + + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + + + TiUP + + - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) \ No newline at end of file From e3f6565f20cdc4bdf445efeb5886468609ff99a6 Mon Sep 17 00:00:00 2001 From: qiancai Date: Wed, 15 Oct 2025 15:23:22 +0800 Subject: [PATCH 02/55] dup: zh -> en --- releases/release-8.5.4.md | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 30747d8ddd1c8..1ef86209cf6d3 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -14,7 +14,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ## Compatibility changes - note [#issue](https://github.com/pingcap/${repo-name}/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) -- (dup): release-7.5.7.md > 兼容性变更 - TiKV 废弃以下配置项，并由新的 [`gc.auto-compaction`](https://docs.pingcap.com/zh/tidb/v7.5/tikv-configuration-file/#gcauto-compaction) 配置项替代，用于控制自动 compaction 行为 [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) +- (dup): release-7.5.7.md > Compatibility changes - TiKV TiKV deprecates the following configuration items and replaces them with the new [`gc.auto-compaction`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file/#gcauto-compaction) configuration group, which controls automatic compaction behavior [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) ## Improvements @@ -22,20 +22,20 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - (dup): release-9.0.0.md(beta.1) > # SQL 功能 * 支持对分区表的非唯一列创建全局索引 [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) - - (dup): release-9.0.0.md(beta.1) > 改进提升> TiDB - 支持由 `IN` 子查询而来的 Semi Join 使用 `semi_join_rewrite` 的 Hint [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) + - (dup): release-9.0.0.md(beta.1) > # SQL * Support creating global indexes on non-unique columns of partitioned tables [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) + - (dup): release-9.0.0.md(beta.1) > Improvements> TiDB - Support applying the `semi_join_rewrite` hint to Semi Joins in `IN` subqueries [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) + TiKV - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - (dup): release-7.5.7.md > 改进提升> TiKV - 优化在存在大量 SST 文件的环境中 async snapshot 和 write 的尾延迟 [#18743](https://github.com/tikv/tikv/issues/18743) @[Connor1996](https://github.com/Connor1996) + - (dup): release-7.5.7.md > Improvements> TiKV - Optimize the tail latency of async snapshot and write operations in environments with a large number of SST files [#18743](https://github.com/tikv/tikv/issues/18743) @[Connor1996](https://github.com/Connor1996) + PD - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - (dup): release-7.5.7.md > 改进提升> PD - 减少非必要的错误日志 [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + - (dup): release-7.5.7.md > Improvements> PD - Reduce unnecessary error logs [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + TiFlash @@ -80,7 +80,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - (dup): release-7.5.7.md > 错误修复> TiDB - 修复估算跨月或跨年的行数时，结果可能过分偏大的问题 [#50080](https://github.com/pingcap/tidb/issues/50080) @[terry1purcell](https://github.com/terry1purcell) + - (dup): release-7.5.7.md > Bug fixes> TiDB - Fix the issue that row count estimates across months or years can be significantly overestimated [#50080](https://github.com/pingcap/tidb/issues/50080) @[terry1purcell](https://github.com/terry1purcell) + TiKV @@ -91,7 +91,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - (dup): release-9.0.0.md(beta.1) > 错误修复> PD - 修复 PD Client 重试策略没有正确初始化的问题 [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) + - (dup): release-9.0.0.md(beta.1) > Bug fixes> PD - Fix the issue that the PD client retry policy is not properly initialized [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) + TiFlash From e3d9d45f06b125435631c2b181ded9c7852aee6c Mon Sep 17 00:00:00 2001 From: qiancai Date: Wed, 15 Oct 2025 15:23:59 +0800 Subject: [PATCH 03/55] Update release-8.5.4.md --- releases/release-8.5.4.md | 82 +++++++++++++++++++-------------------- 1 file changed, 41 insertions(+), 41 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 1ef86209cf6d3..f7f776684a964 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -13,119 +13,119 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ## Compatibility changes -- note [#issue](https://github.com/pingcap/${repo-name}/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) +- note [#issue](https://github.com/pingcap/${repo-name}/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - (dup): release-7.5.7.md > Compatibility changes - TiKV TiKV deprecates the following configuration items and replaces them with the new [`gc.auto-compaction`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file/#gcauto-compaction) configuration group, which controls automatic compaction behavior [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) ## Improvements + TiDB - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - (dup): release-9.0.0.md(beta.1) > # SQL * Support creating global indexes on non-unique columns of partitioned tables [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) - (dup): release-9.0.0.md(beta.1) > Improvements> TiDB - Support applying the `semi_join_rewrite` hint to Semi Joins in `IN` subqueries [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) + TiKV - - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - (dup): release-7.5.7.md > Improvements> TiKV - Optimize the tail latency of async snapshot and write operations in environments with a large number of SST files [#18743](https://github.com/tikv/tikv/issues/18743) @[Connor1996](https://github.com/Connor1996) + PD - - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - (dup): release-7.5.7.md > Improvements> PD - Reduce unnecessary error logs [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + TiFlash - - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + Tools + Backup & Restore (BR) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiCDC - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiDB Data Migration (DM) - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiDB Lightning - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + Dumpling - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiUP - - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) ## Bug fixes + TiDB - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - (dup): release-7.5.7.md > Bug fixes> TiDB - Fix the issue that row count estimates across months or years can be significantly overestimated [#50080](https://github.com/pingcap/tidb/issues/50080) @[terry1purcell](https://github.com/terry1purcell) + TiKV - - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + PD - - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - (dup): release-9.0.0.md(beta.1) > Bug fixes> PD - Fix the issue that the PD client retry policy is not properly initialized [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) + TiFlash - - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + Tools + Backup & Restore (BR) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiCDC - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiDB Data Migration (DM) - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiDB Lightning - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + Dumpling - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiUP - - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id}) \ No newline at end of file + - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) \ No newline at end of file From 37bcef0c8e797b229bbfdcd6be1a8a1cd6142e0a Mon Sep 17 00:00:00 2001 From: qiancai Date: Wed, 15 Oct 2025 15:25:41 +0800 Subject: [PATCH 04/55] Update release-8.5.4.md --- releases/release-8.5.4.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index f7f776684a964..478f489d5544c 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -16,6 +16,9 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - note [#issue](https://github.com/pingcap/${repo-name}/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - (dup): release-7.5.7.md > Compatibility changes - TiKV TiKV deprecates the following configuration items and replaces them with the new [`gc.auto-compaction`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file/#gcauto-compaction) configuration group, which controls automatic compaction behavior [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) + - Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). + - New configuration items: [`gc.auto-compaction.check-interval`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#check-interval-new-in-v757), [`gc.auto-compaction.tombstone-num-threshold`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#tombstone-num-threshold-new-in-v757), [`gc.auto-compaction.tombstone-percent-threshold`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#tombstone-percent-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-threshold`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#redundant-rows-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-percent-threshold`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#redundant-rows-percent-threshold-new-in-v757), and [`gc.auto-compaction.bottommost-level-force`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#bottommost-level-force-new-in-v757). + ## Improvements + TiDB From 5281ea75b375910f0d0532c8fccae85ba5262f4f Mon Sep 17 00:00:00 2001 From: qiancai Date: Wed, 15 Oct 2025 15:28:38 +0800 Subject: [PATCH 05/55] Update release-8.5.4.md --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 478f489d5544c..ba131071ad886 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -5,7 +5,7 @@ summary: Learn about the compatibility changes, improvements, and bug fixes in T # TiDB 8.5.4 Release Notes -Release date: August 14, 2025 +Release date: xx xx, 2025 TiDB version: 8.5.4 From 6ce2fd68a4c43882700c48454bbaee8b8cc95596 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Wed, 15 Oct 2025 15:49:54 +0800 Subject: [PATCH 06/55] Update releases/release-8.5.4.md Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> --- releases/release-8.5.4.md | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index ba131071ad886..97c3f4ed01e72 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -14,10 +14,10 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ## Compatibility changes - note [#issue](https://github.com/pingcap/${repo-name}/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) -- (dup): release-7.5.7.md > Compatibility changes - TiKV TiKV deprecates the following configuration items and replaces them with the new [`gc.auto-compaction`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file/#gcauto-compaction) configuration group, which controls automatic compaction behavior [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) +- (dup): release-7.5.7.md > Compatibility changes - TiKV deprecates the following configuration items and replaces them with the new [`gc.auto-compaction`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file/#gcauto-compaction) configuration group, which controls automatic compaction behavior [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) - - Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). - - New configuration items: [`gc.auto-compaction.check-interval`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#check-interval-new-in-v757), [`gc.auto-compaction.tombstone-num-threshold`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#tombstone-num-threshold-new-in-v757), [`gc.auto-compaction.tombstone-percent-threshold`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#tombstone-percent-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-threshold`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#redundant-rows-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-percent-threshold`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#redundant-rows-percent-threshold-new-in-v757), and [`gc.auto-compaction.bottommost-level-force`](https://docs.pingcap.com/tidb/v7.5/tikv-configuration-file#bottommost-level-force-new-in-v757). + - Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). + - New configuration items: [`gc.auto-compaction.check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#check-interval-new-in-v757), [`gc.auto-compaction.tombstone-num-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-num-threshold-new-in-v757), [`gc.auto-compaction.tombstone-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-percent-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-percent-threshold-new-in-v757), and [`gc.auto-compaction.bottommost-level-force`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#bottommost-level-force-new-in-v757). ## Improvements From 7c914d224307a00544a56fcf11af27b8e2bb4fd1 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Mon, 20 Oct 2025 09:57:34 +0800 Subject: [PATCH 07/55] add bug fixes for br MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Co-authored-by: 山岚 <36239017+YuJuncen@users.noreply.github.com> --- releases/release-8.5.4.md | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 97c3f4ed01e72..767719d14905c 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -49,7 +49,13 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + Backup & Restore (BR) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - Fix the issue where Zstd compression did not take effect in log backup, resulting in uncompressed output. [#18836](https://github.com/tikv/tikv/issues/18836) @[3pointer](https://github.com/3pointer) + - Fixed a bug that may cause flush operation slow in azure blob storage. [#18410](https://github.com/tikv/tikv/issues/18410) @[YuJuncen](https://github.com/YuJuncen) + - Fixed a bug that may cause `log truncate` panic when failed to delete file. [#63358](https://github.com/pingcap/tidb/issues/63358) @[YuJuncen](https://github.com/YuJuncen) + - Fixed a bug that may cause `stats_meta` be zero when checksumming disabled. [#60978](https://github.com/pingcap/tidb/issues/60978) @[Leavrth](https://github.com/Leavrth) + - Reduced chance of BR restore failure from S3-compatible storage when the S3 server limits bandwidth through traffic shaping. [#18846](https://github.com/tikv/tikv/issues/18846) @[kennytm](https://github.com/kennytm) + - Fix the issue that the log backup observer loses observation of a region. [#18243](https://github.com/tikv/tikv/issues/18243) @[Leavrth](https://github.com/Leavrth) + - Fixed a a bug that may cause `restore point` fail when there are some special sized table schemas. [#63663](https://github.com/pingcap/tidb/issues/63663) @[RidRisR](https://github.com/RidRisR) - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiCDC From faf0b0a527e57c80dd95b05385cc58e50a880697 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Mon, 20 Oct 2025 09:59:58 +0800 Subject: [PATCH 08/55] Apply suggestions from code review --- releases/release-8.5.4.md | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 767719d14905c..a01bd79337d7e 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -49,13 +49,6 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + Backup & Restore (BR) - - Fix the issue where Zstd compression did not take effect in log backup, resulting in uncompressed output. [#18836](https://github.com/tikv/tikv/issues/18836) @[3pointer](https://github.com/3pointer) - - Fixed a bug that may cause flush operation slow in azure blob storage. [#18410](https://github.com/tikv/tikv/issues/18410) @[YuJuncen](https://github.com/YuJuncen) - - Fixed a bug that may cause `log truncate` panic when failed to delete file. [#63358](https://github.com/pingcap/tidb/issues/63358) @[YuJuncen](https://github.com/YuJuncen) - - Fixed a bug that may cause `stats_meta` be zero when checksumming disabled. [#60978](https://github.com/pingcap/tidb/issues/60978) @[Leavrth](https://github.com/Leavrth) - - Reduced chance of BR restore failure from S3-compatible storage when the S3 server limits bandwidth through traffic shaping. [#18846](https://github.com/tikv/tikv/issues/18846) @[kennytm](https://github.com/kennytm) - - Fix the issue that the log backup observer loses observation of a region. [#18243](https://github.com/tikv/tikv/issues/18243) @[Leavrth](https://github.com/Leavrth) - - Fixed a a bug that may cause `restore point` fail when there are some special sized table schemas. [#63663](https://github.com/pingcap/tidb/issues/63663) @[RidRisR](https://github.com/RidRisR) - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiCDC @@ -112,6 +105,13 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + Backup & Restore (BR) - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - Fix the issue where Zstd compression did not take effect in log backup, resulting in uncompressed output. [#18836](https://github.com/tikv/tikv/issues/18836) @[3pointer](https://github.com/3pointer) + - Fixed a bug that may cause flush operation slow in azure blob storage. [#18410](https://github.com/tikv/tikv/issues/18410) @[YuJuncen](https://github.com/YuJuncen) + - Fixed a bug that may cause `log truncate` panic when failed to delete file. [#63358](https://github.com/pingcap/tidb/issues/63358) @[YuJuncen](https://github.com/YuJuncen) + - Fixed a bug that may cause `stats_meta` be zero when checksumming disabled. [#60978](https://github.com/pingcap/tidb/issues/60978) @[Leavrth](https://github.com/Leavrth) + - Reduced chance of BR restore failure from S3-compatible storage when the S3 server limits bandwidth through traffic shaping. [#18846](https://github.com/tikv/tikv/issues/18846) @[kennytm](https://github.com/kennytm) + - Fix the issue that the log backup observer loses observation of a region. [#18243](https://github.com/tikv/tikv/issues/18243) @[Leavrth](https://github.com/Leavrth) + - Fixed a a bug that may cause `restore point` fail when there are some special sized table schemas. [#63663](https://github.com/pingcap/tidb/issues/63663) @[RidRisR](https://github.com/RidRisR) - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiCDC From e2cb0042e9782d900348152be048babd0a386360 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E7=AB=A5=E5=89=91?= <1045931706@qq.com> Date: Mon, 20 Oct 2025 15:02:09 +0800 Subject: [PATCH 09/55] pd part MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: 童剑 <1045931706@qq.com> --- releases/release-8.5.4.md | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index a01bd79337d7e..a9342689db625 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -36,9 +36,9 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + PD - - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - (dup): release-7.5.7.md > Improvements> PD - Reduce unnecessary error logs [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + - degrade some unecessary error log [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + - upgrade the golang and dependent version[#9788](https://github.com/tikv/pd/issues/9788) @[JmPotato](https://github.com/JmPotato) + - support to distribute table feature, make scatter easier #[8986](https://github.com/tikv/pd/issues/8986) @[bufferflies](https://github.com/bufferflies) + TiFlash @@ -91,9 +91,13 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + PD - - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - (dup): release-9.0.0.md(beta.1) > Bug fixes> PD - Fix the issue that the PD client retry policy is not properly initialized [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) + - Fix PD Client initial strategy not work well [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) + - Fix the wrong APIS of the `/config` 和 `/members` [#9797](https://github.com/tikv/pd/issues/9797) @[lhy1024](https://github.com/lhy1024) + - Fix the handler way of the tso error #[9188](https://github.com/tikv/pd/issues/9188) @[Tema](https://github.com/Tema) + - Fix the bucket split still work even if the bucket doesn't report #[9726](https://github.com/tikv/pd/issues/9726) @[bufferflies](https://github.com/bufferflies) + - Fix the wrong token allocation of the resource manager #[9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) + - Fix the placement rule revert after pd leader changed #[9602](https://github.com/tikv/pd/issues/9602) @[okJiang](https://github.com/okJiang) + - Fix the ttl configuration not work #[9343](https://github.com/tikv/pd/issues/9343) @[lhy1024](https://github.com/lhy1024) + TiFlash From bb54f01fc17f795eb23dc0f17c9b295c002d8089 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Tue, 21 Oct 2025 16:20:26 +0800 Subject: [PATCH 10/55] add cdc bug fixes Co-authored-by: hongyunyan <649330952@qq.com> --- releases/release-8.5.4.md | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index a9342689db625..7c7d05e930906 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -53,7 +53,13 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiCDC - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - Fix the issue that configuring the column dispatcher with virtual columns might cause a panic. [#12241](https://github.com/pingcap/tiflow/issues/12241) @[wk989898](https://github.com/wk989898) + - Fix the issue that closing ddl puller might cause a panic. [#12244](https://github.com/pingcap/tiflow/issues/12244) @[wk989898](https://github.com/wk989898) + - Support discarding unsupported DDL by setting `ignore-txn-start-ts` in filter. [#12286](https://github.com/pingcap/tiflow/issues/12286) @[asddongmen](https://github.com/asddongmen) + - Fix the issue that using Azure Downstream might cause stuck. [#12277] (https://github.com/pingcap/tiflow/issues/12277) @[zurakutsia](https://github.com/zurakutsia) + - Fix the issue that `drop foreign key` is not replicated to downstream [#12328](https://github.com/pingcap/tiflow/issues/12328) @[3AceShowHand](https://github.com/3AceShowHand) + - Fix the panic issue when subscribe the region and meet rollback and prewrite entry [#19048](https://github.com/tikv/tikv/issues/19048) @[3AceShowHand](https://github.com/3AceShowHand) + - Fix a TiKV assertion panic [#18498](https://github.com/tikv/tikv/issues/18498) @[tharanga](https://github.com/tharanga) - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiDB Data Migration (DM) From 2aa77a7d41fe7afc78effbdab20b34cce262b4fc Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Fri, 24 Oct 2025 10:18:35 +0800 Subject: [PATCH 11/55] adjust notes location --- releases/release-8.5.4.md | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 7c7d05e930906..ea9afaf37f1c5 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -53,14 +53,6 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiCDC - - Fix the issue that configuring the column dispatcher with virtual columns might cause a panic. [#12241](https://github.com/pingcap/tiflow/issues/12241) @[wk989898](https://github.com/wk989898) - - Fix the issue that closing ddl puller might cause a panic. [#12244](https://github.com/pingcap/tiflow/issues/12244) @[wk989898](https://github.com/wk989898) - - Support discarding unsupported DDL by setting `ignore-txn-start-ts` in filter. [#12286](https://github.com/pingcap/tiflow/issues/12286) @[asddongmen](https://github.com/asddongmen) - - Fix the issue that using Azure Downstream might cause stuck. [#12277] (https://github.com/pingcap/tiflow/issues/12277) @[zurakutsia](https://github.com/zurakutsia) - - Fix the issue that `drop foreign key` is not replicated to downstream [#12328](https://github.com/pingcap/tiflow/issues/12328) @[3AceShowHand](https://github.com/3AceShowHand) - - Fix the panic issue when subscribe the region and meet rollback and prewrite entry [#19048](https://github.com/tikv/tikv/issues/19048) @[3AceShowHand](https://github.com/3AceShowHand) - - Fix a TiKV assertion panic [#18498](https://github.com/tikv/tikv/issues/18498) @[tharanga](https://github.com/tharanga) - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiDB Data Migration (DM) @@ -103,6 +95,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Fix the bucket split still work even if the bucket doesn't report #[9726](https://github.com/tikv/pd/issues/9726) @[bufferflies](https://github.com/bufferflies) - Fix the wrong token allocation of the resource manager #[9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) - Fix the placement rule revert after pd leader changed #[9602](https://github.com/tikv/pd/issues/9602) @[okJiang](https://github.com/okJiang) + - 修复 backoff 初始化错误问题 #[9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) - Fix the ttl configuration not work #[9343](https://github.com/tikv/pd/issues/9343) @[lhy1024](https://github.com/lhy1024) + TiFlash @@ -126,8 +119,13 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiCDC - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - Fix the issue that configuring the column dispatcher with virtual columns might cause a panic. [#12241](https://github.com/pingcap/tiflow/issues/12241) @[wk989898](https://github.com/wk989898) + - Fix the issue that closing ddl puller might cause a panic. [#12244](https://github.com/pingcap/tiflow/issues/12244) @[wk989898](https://github.com/wk989898) + - Support discarding unsupported DDL by setting `ignore-txn-start-ts` in filter. [#12286](https://github.com/pingcap/tiflow/issues/12286) @[asddongmen](https://github.com/asddongmen) + - Fix the issue that using Azure Downstream might cause stuck. [#12277] (https://github.com/pingcap/tiflow/issues/12277) @[zurakutsia](https://github.com/zurakutsia) + - Fix the issue that `drop foreign key` is not replicated to downstream [#12328](https://github.com/pingcap/tiflow/issues/12328) @[3AceShowHand](https://github.com/3AceShowHand) + - Fix the panic issue when subscribe the region and meet rollback and prewrite entry [#19048](https://github.com/tikv/tikv/issues/19048) @[3AceShowHand](https://github.com/3AceShowHand) + - Fix a TiKV assertion panic [#18498](https://github.com/tikv/tikv/issues/18498) @[tharanga](https://github.com/tharanga) + TiDB Data Migration (DM) From 8a76d43c548a34422c0d0187ec1085dc04354f78 Mon Sep 17 00:00:00 2001 From: qiancai Date: Mon, 27 Oct 2025 15:09:36 +0800 Subject: [PATCH 12/55] sync from zh --- releases/release-8.5.4.md | 161 ++++++++++++++++++-------------------- 1 file changed, 78 insertions(+), 83 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index ea9afaf37f1c5..b1a06021951d4 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -13,7 +13,6 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ## Compatibility changes -- note [#issue](https://github.com/pingcap/${repo-name}/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - (dup): release-7.5.7.md > Compatibility changes - TiKV deprecates the following configuration items and replaces them with the new [`gc.auto-compaction`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file/#gcauto-compaction) configuration group, which controls automatic compaction behavior [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) - Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). @@ -21,73 +20,88 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ## Improvements -+ TiDB - - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - (dup): release-9.0.0.md(beta.1) > # SQL * Support creating global indexes on non-unique columns of partitioned tables [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) - - (dup): release-9.0.0.md(beta.1) > Improvements> TiDB - Support applying the `semi_join_rewrite` hint to Semi Joins in `IN` subqueries [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) - -+ TiKV - - - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - (dup): release-7.5.7.md > Improvements> TiKV - Optimize the tail latency of async snapshot and write operations in environments with a large number of SST files [#18743](https://github.com/tikv/tikv/issues/18743) @[Connor1996](https://github.com/Connor1996) - -+ PD ++ TiDB + + - (dup): release-9.0.0.md(beta.1) > # SQL 功能 * 支持对分区表的非唯一列创建全局索引 [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) + - (dup): release-9.0.0.md(beta.1) > 改进提升> TiDB - 支持由 `IN` 子查询而来的 Semi Join 使用 `semi_join_rewrite` 的 Hint [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) + - 微调了参数 tidb_opt_ordering_index_selectivity_ratio 生效时的估算策略 [#62817](https://github.com/pingcap/tidb/issues/62817) @[terry1purcell](https://github.com/terry1purcell) + - 新增配置项 tidb_opt_enable_semi_join_rewrite 去控制 exists 子查询是否需要被改写 [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) + - 微调了优化器选择逻辑，在某些情况下新索引更容易被选中 [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) + - 优化了 NDV 较小的列的查询估算逻辑 [#61792](https://github.com/pingcap/tidb/issues/61792) @[terry1purcell](https://github.com/terry1purcell) + - 微调了 limit offset 出现在 Index Join 查询中的估算策略 [#45077](https://github.com/pingcap/tidb/issues/45077) @[qw4990](https://github.com/qw4990) + - 新增 session variable “tidb_opt_enable_no_decorrelate_in_select” 去控制 select list 中的子查询是否需要被解关联 [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) + - 优化了 Merge join 计算 cost 可能存在遗漏 filter 的情况 [#62917](https://github.com/pingcap/tidb/issues/62917) @[qw4990](https://github.com/qw4990) + - 优化了在统计信息收集不及时情况下，越界估算的策略 [#58068](https://github.com/pingcap/tidb/issues/58068) @[terry1purcell](https://github.com/terry1purcell) + - 在执行时间概览中添加 Backoff 时间以便调试 [#61441](https://github.com/pingcap/tidb/issues/61441) @[dbsid](https://github.com/dbsid) + - 在审计日志插件中添加语句 ID 信息 [#63525](https://github.com/pingcap/tidb/issues/63525) @[YangKeao](https://github.com/YangKeao) + - 为审计日志插件添加缓冲日志支持：[#63650](https://github.com/pingcap/tidb/issues/63650) @[bb7133](https://github.com/bb7133) + - instance.plugin_audit_log_flush_interval：刷新缓冲审计日志的时间间隔 + - instance.plugin_audit_log_buffer_size：插件审计日志的缓冲区大小（字节），默认值为 0（不使用缓冲） + ++ TiKV + + - 将部分 BR 模块的可自动恢复的错误的日志级别从ERROR 调整为 WARN [#18493](https://github.com/tikv/tikv/issues/18493) @[YuJuncen](https://github.com/YuJuncen) + - 将 Raft 模块检查 GC 的流程拆分为两个阶段，提升 Region 冗余 MVCC 版本 GC 的效率。[#18695](https://github.com/tikv/tikv/issues/18695) @[v01dstar](https://github.com/v01dstar) + - 基于 GC safe point 和 Rocksdb 的统计信息计算 MVCC 的冗余读，提升 compaction 的效率和准确性。[#18697](https://github.com/tikv/tikv/issues/18697) @[v01dstar](https://github.com/v01dstar) + - 将部分 TiKV 的错误日志从 ERROR 级别调整为 WARN 级别，避免产生过多不必要的告警。[#18745](https://github.com/tikv/tikv/issues/18745) @[exit-code-1](https://github.com/exit-code-1) + - 将 Region MVCC 的 GC 处理逻辑改由 GC worker 线程执行，统一 GC 的处理逻辑。 [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) + - 优化 gRPC 线程池线程数量默认值的计算方式，将原来的固定数据调整为根据总的 CPU 配置动态计算，避免 gRPC 线程数量太小产生的性能瓶颈。 [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) + - (dup): release-7.5.7.md > 改进提升> TiKV - 优化在存在大量 SST 文件的环境中 async snapshot 和 write 的尾延迟 [#18743](https://github.com/tikv/tikv/issues/18743) @[Connor1996](https://github.com/Connor1996) + ++ PD - degrade some unecessary error log [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) - upgrade the golang and dependent version[#9788](https://github.com/tikv/pd/issues/9788) @[JmPotato](https://github.com/JmPotato) - support to distribute table feature, make scatter easier #[8986](https://github.com/tikv/pd/issues/8986) @[bufferflies](https://github.com/bufferflies) -+ TiFlash ++ TiFlash - - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - 跳过不必要读取的数据，优化 TableScan 的读取性能 [#9875](https://github.com/pingcap/tiflash/issues/9875) @[gengliqi](https://github.com/gengliqi) + - 优化 TiFlash 在宽且稀疏的表上 TableScan 的性能 [#10361](https://github.com/pingcap/tiflash/issues/10361) @[JaySon-Huang](https://github.com/JaySon-Huang) + - 优化当集群存在大量表时，添加向量索引时的 TiFlash CPU 开销 [#10357](https://github.com/pingcap/tiflash/issues/10357) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) + - 减少不必要的处理 raft commands 时的日志 [#10467](https://github.com/pingcap/tiflash/issues/10467) @[JaySon-Huang](https://github.com/JaySon-Huang) + Tools - + Backup & Restore (BR) - - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - + TiCDC - - - + TiDB Data Migration (DM) - - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - + TiDB Lightning - - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - + Dumpling - - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + + TiDB Data Migration (DM) - + TiUP - - - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - 修复获取上游 `GTID_MODE` 时大小写不兼容的问题 [#12167](https://github.com/pingcap/tiflow/issues/12167) @[OliverS929](https://github.com/OliverS929) ## Bug fixes -+ TiDB - - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - (dup): release-7.5.7.md > Bug fixes> TiDB - Fix the issue that row count estimates across months or years can be significantly overestimated [#50080](https://github.com/pingcap/tidb/issues/50080) @[terry1purcell](https://github.com/terry1purcell) - -+ TiKV - - - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - -+ PD ++ TiDB + + - 修复当 `tidb_isolation_read_engines` 设置为 "tiflash" 时，`use index` hint 无法生效的问题 [#60869](https://github.com/pingcap/tidb/issues/60869) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) + - 修复了 `max_execution_time` 对 `SELECT FOR UPDATE` 语句不生效的问题. [#62960](https://github.com/pingcap/tidb/issues/62960) @[ekexium](https://github.com/ekexium) + - (dup): release-7.5.7.md > 错误修复> TiDB - 修复估算跨月或跨年的行数时，结果可能过分偏大的问题 [#50080](https://github.com/pingcap/tidb/issues/50080) @[terry1purcell](https://github.com/terry1purcell) + - 修复预处理语句中处理 decimal 与 mysql 不一致的问题 [#62602](https://github.com/pingcap/tidb/issues/62602) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) + - 修复 `truncate` 函数中短路径处理错误的问题 [#57608](https://github.com/pingcap/tidb/issues/57608) @[xzhangxian1008](https://github.com/xzhangxian1008) + - 修复当 `Out Of Quota For Local Temporary Space` 触发时，spill 文件可能未被全部删除的问题 [#63216](https://github.com/pingcap/tidb/issues/63216) @[xzhangxian1008](https://github.com/xzhangxian1008) + - 修复查询`INFORMATION_SCHEMA`表使用正则表达式过滤结果不正确的问题 [#62347](https://github.com/pingcap/tidb/issues/62347) @[River2000i](https://github.com/River2000i) + - 修复从 PD 获取 timestamp 异常时没有返回错误的问题 [#58871](https://github.com/pingcap/tidb/issues/58871) @[joechenrh](https://github.com/joechenrh) + - 修复modify column时，owner TiDB和非ownerTiDB查询数据不一致的问题 [#60264](https://github.com/pingcap/tidb/issues/60264) @[tangenta](https://github.com/tangenta) + - 修复动态调参后 `ADMIN ALTER DDL JOBS`显示参数不正确的问题 [#63201](https://github.com/pingcap/tidb/issues/63201) @[fzzf678](https://github.com/fzzf678) + - 修复通过事务加索引时GC savepoint 不推进的问题 [#62424](https://github.com/pingcap/tidb/issues/62424) @[wjhuang2016](https://github.com/wjhuang2016) + - 修复过大的 SST 文件 ingest 到 L0 中导致流控的问题 [#63466](https://github.com/pingcap/tidb/issues/63466) @[CbcWestwolf](https://github.com/CbcWestwolf) + - 修复当 CPU 和 memory 比例为 1:2 时阻塞 global sort 的问题 [#60951](https://github.com/pingcap/tidb/issues/60951) @[wjhuang2016](https://github.com/wjhuang2016) + - 修复超过 16 个 DXF 任务上限时无法 cancel pending 任务的问题 [#63896](https://github.com/pingcap/tidb/issues/63896) @[D3Hunter](https://github.com/D3Hunter) + - 修复cancel DXF任务后，其他任务无法退出的问题 [#63927](https://github.com/pingcap/tidb/issues/63927) @[D3Hunter](https://github.com/D3Hunter) + - 修复 apply 并发设置后，query 带 index join 导致无法生成 plan 的问题 [#59863](https://github.com/pingcap/tidb/issues/59863) @[hawkingrei](https://github.com/hawkingrei) + - 修复查询使用 ATAN2 函数可能导致的结果错误问题 [#60093](https://github.com/pingcap/tidb/issues/60093) @[guo-shaoge](https://github.com/guo-shaoge) + - 修复了 select 1 from duml 不可使用 instance 级别 plan cache 的问题 [#63075](https://github.com/pingcap/tidb/issues/63075) @[time-and-fate](https://github.com/time-and-fate) + - 修复了 join order 变更顺序后可能导致的无法规划问题 [#61715](https://github.com/pingcap/tidb/issues/61715) @[hawkingrei](https://github.com/hawkingrei) + - 修复了 set_var hint 使用 binding 后有可能无法恢复回原始 variable 设置的问题 [#59822](https://github.com/pingcap/tidb/issues/59822) @[wddevries](https://github.com/wddevries) + - 修复了 ONLY_FULL_GROUP_BY 在取值为负时可能会检查错误的问题 [#62617](https://github.com/pingcap/tidb/issues/62617) @[AilinKid](https://github.com/AilinKid) + - 修复了 ONLY_FULL_GROUP_BY 检查大小写不敏感问题 [#62672](https://github.com/pingcap/tidb/issues/62672) @[AilinKid](https://github.com/AilinKid) + - 修复 DP join order 算法可能产生的错误 plan 问题 [#63353](https://github.com/pingcap/tidb/issues/63353) @[winoros](https://github.com/winoros) + - 修复了 outer join 改写为 inner join 可能产生的错误 [#61327](https://github.com/pingcap/tidb/issues/61327) @[hawkingrei](https://github.com/hawkingrei) + - 修复查询执行可能导致内部 panic 的问题 [#58600](https://github.com/pingcap/tidb/issues/58600) @[Defined2014](https://github.com/Defined2014) + - 修复全局索引在某些 ALTER PARTITION 状态下获取错误数据的问题 [#64084](https://github.com/pingcap/tidb/pull/64084) @[mjonss](https://github.com/mjonss) + - 修复全局索引在某些情况下返回错误结果的问题 [#61083](https://github.com/pingcap/tidb/issues/61083) @[Defined2014](https://github.com/Defined2014) + - 修复 character_set_results 在遇到错误字符时截断而不是替换的问题 [#61085](https://github.com/pingcap/tidb/issues/61085) @[xhebox](https://github.com/xhebox) + - 修复 ADD COLUMN 与 UPDATE 并发执行时的问题 [#60047](https://github.com/pingcap/tidb/issues/60047) @[L-maple](https://github.com/L-maple) + ++ PD - Fix PD Client initial strategy not work well [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) - Fix the wrong APIS of the `/config` 和 `/members` [#9797](https://github.com/tikv/pd/issues/9797) @[lhy1024](https://github.com/lhy1024) @@ -98,16 +112,18 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - 修复 backoff 初始化错误问题 #[9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) - Fix the ttl configuration not work #[9343](https://github.com/tikv/pd/issues/9343) @[lhy1024](https://github.com/lhy1024) -+ TiFlash ++ TiFlash - - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - 修复当查询的列存储大量 `NULL` 值时，可能导致查询失败的问题 [#10340](https://github.com/pingcap/tiflash/issues/10340) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) + - 修复 TiFlash 消耗超过预期的 RU 的问题 [#10380](https://github.com/pingcap/tiflash/issues/10380) @[JinheLin](https://github.com/JinheLin) + - 修复存算分离架构下，在存在慢查询时 TiFlash 容易发生 OOM 的问题 [#10278](https://github.com/pingcap/tiflash/issues/10278) @[JaySon-Huang](https://github.com/JaySon-Huang) + - 修复存算分离架构下，TiFlash 遇到与 S3 网络分区时可能无限重试的问题 [#10424](https://github.com/pingcap/tiflash/issues/10424) @[JaySon-Huang](https://github.com/JaySon-Huang) + - 修复了当参数为 `decimal` 类型时，`floor` 和 `ceil` 函数结果可能不正确的问题 [#10365](https://github.com/pingcap/tidb/issues/10365) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) + Tools - + Backup & Restore (BR) + + Backup & Restore (BR) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - Fix the issue where Zstd compression did not take effect in log backup, resulting in uncompressed output. [#18836](https://github.com/tikv/tikv/issues/18836) @[3pointer](https://github.com/3pointer) - Fixed a bug that may cause flush operation slow in azure blob storage. [#18410](https://github.com/tikv/tikv/issues/18410) @[YuJuncen](https://github.com/YuJuncen) - Fixed a bug that may cause `log truncate` panic when failed to delete file. [#63358](https://github.com/pingcap/tidb/issues/63358) @[YuJuncen](https://github.com/YuJuncen) @@ -115,9 +131,8 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Reduced chance of BR restore failure from S3-compatible storage when the S3 server limits bandwidth through traffic shaping. [#18846](https://github.com/tikv/tikv/issues/18846) @[kennytm](https://github.com/kennytm) - Fix the issue that the log backup observer loses observation of a region. [#18243](https://github.com/tikv/tikv/issues/18243) @[Leavrth](https://github.com/Leavrth) - Fixed a a bug that may cause `restore point` fail when there are some special sized table schemas. [#63663](https://github.com/pingcap/tidb/issues/63663) @[RidRisR](https://github.com/RidRisR) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - + TiCDC + + TiCDC - Fix the issue that configuring the column dispatcher with virtual columns might cause a panic. [#12241](https://github.com/pingcap/tiflow/issues/12241) @[wk989898](https://github.com/wk989898) - Fix the issue that closing ddl puller might cause a panic. [#12244](https://github.com/pingcap/tiflow/issues/12244) @[wk989898](https://github.com/wk989898) @@ -125,24 +140,4 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Fix the issue that using Azure Downstream might cause stuck. [#12277] (https://github.com/pingcap/tiflow/issues/12277) @[zurakutsia](https://github.com/zurakutsia) - Fix the issue that `drop foreign key` is not replicated to downstream [#12328](https://github.com/pingcap/tiflow/issues/12328) @[3AceShowHand](https://github.com/3AceShowHand) - Fix the panic issue when subscribe the region and meet rollback and prewrite entry [#19048](https://github.com/tikv/tikv/issues/19048) @[3AceShowHand](https://github.com/3AceShowHand) - - Fix a TiKV assertion panic [#18498](https://github.com/tikv/tikv/issues/18498) @[tharanga](https://github.com/tharanga) - - + TiDB Data Migration (DM) - - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - + TiDB Lightning - - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - + Dumpling - - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - + TiUP - - - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) - - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) \ No newline at end of file + - Fix a TiKV assertion panic [#18498](https://github.com/tikv/tikv/issues/18498) @[tharanga](https://github.com/tharanga) \ No newline at end of file From 48086547dc5b54a243d5f937f832c691f7a7601e Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Tue, 28 Oct 2025 15:29:14 +0800 Subject: [PATCH 13/55] Apply suggestions from code review --- releases/release-8.5.4.md | 40 +++++++++++++++++++-------------------- 1 file changed, 20 insertions(+), 20 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index b1a06021951d4..d76d141f11310 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -65,7 +65,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiDB Data Migration (DM) - - 修复获取上游 `GTID_MODE` 时大小写不兼容的问题 [#12167](https://github.com/pingcap/tiflow/issues/12167) @[OliverS929](https://github.com/OliverS929) + - Support case-insensitive compatibility when retrieving the upstream GTID_MODE [#12167](https://github.com/pingcap/tiflow/issues/12167) @[OliverS929](https://github.com/OliverS929) ## Bug fixes @@ -86,20 +86,20 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - 修复当 CPU 和 memory 比例为 1:2 时阻塞 global sort 的问题 [#60951](https://github.com/pingcap/tidb/issues/60951) @[wjhuang2016](https://github.com/wjhuang2016) - 修复超过 16 个 DXF 任务上限时无法 cancel pending 任务的问题 [#63896](https://github.com/pingcap/tidb/issues/63896) @[D3Hunter](https://github.com/D3Hunter) - 修复cancel DXF任务后，其他任务无法退出的问题 [#63927](https://github.com/pingcap/tidb/issues/63927) @[D3Hunter](https://github.com/D3Hunter) - - 修复 apply 并发设置后，query 带 index join 导致无法生成 plan 的问题 [#59863](https://github.com/pingcap/tidb/issues/59863) @[hawkingrei](https://github.com/hawkingrei) - - 修复查询使用 ATAN2 函数可能导致的结果错误问题 [#60093](https://github.com/pingcap/tidb/issues/60093) @[guo-shaoge](https://github.com/guo-shaoge) - - 修复了 select 1 from duml 不可使用 instance 级别 plan cache 的问题 [#63075](https://github.com/pingcap/tidb/issues/63075) @[time-and-fate](https://github.com/time-and-fate) - - 修复了 join order 变更顺序后可能导致的无法规划问题 [#61715](https://github.com/pingcap/tidb/issues/61715) @[hawkingrei](https://github.com/hawkingrei) - - 修复了 set_var hint 使用 binding 后有可能无法恢复回原始 variable 设置的问题 [#59822](https://github.com/pingcap/tidb/issues/59822) @[wddevries](https://github.com/wddevries) - - 修复了 ONLY_FULL_GROUP_BY 在取值为负时可能会检查错误的问题 [#62617](https://github.com/pingcap/tidb/issues/62617) @[AilinKid](https://github.com/AilinKid) - - 修复了 ONLY_FULL_GROUP_BY 检查大小写不敏感问题 [#62672](https://github.com/pingcap/tidb/issues/62672) @[AilinKid](https://github.com/AilinKid) - - 修复 DP join order 算法可能产生的错误 plan 问题 [#63353](https://github.com/pingcap/tidb/issues/63353) @[winoros](https://github.com/winoros) - - 修复了 outer join 改写为 inner join 可能产生的错误 [#61327](https://github.com/pingcap/tidb/issues/61327) @[hawkingrei](https://github.com/hawkingrei) - - 修复查询执行可能导致内部 panic 的问题 [#58600](https://github.com/pingcap/tidb/issues/58600) @[Defined2014](https://github.com/Defined2014) - - 修复全局索引在某些 ALTER PARTITION 状态下获取错误数据的问题 [#64084](https://github.com/pingcap/tidb/pull/64084) @[mjonss](https://github.com/mjonss) - - 修复全局索引在某些情况下返回错误结果的问题 [#61083](https://github.com/pingcap/tidb/issues/61083) @[Defined2014](https://github.com/Defined2014) - - 修复 character_set_results 在遇到错误字符时截断而不是替换的问题 [#61085](https://github.com/pingcap/tidb/issues/61085) @[xhebox](https://github.com/xhebox) - - 修复 ADD COLUMN 与 UPDATE 并发执行时的问题 [#60047](https://github.com/pingcap/tidb/issues/60047) @[L-maple](https://github.com/L-maple) + - Fix the issue that enabling the `Apply` operator concurrency (`tidb_enable_parallel_apply = on`) causes plan generation failure due to a missing clone implementation [#59863](https://github.com/pingcap/tidb/issues/59863) @[hawkingrei](https://github.com/hawkingrei) + - Fix the issue that using the `ATAN2` function might produce incorrect results [#60093](https://github.com/pingcap/tidb/issues/60093) @[guo-shaoge](https://github.com/guo-shaoge) + - Fix the issue that `select 1 from duml` cannot use the instance-level plan cache [#63075](https://github.com/pingcap/tidb/issues/63075) @[time-and-fate](https://github.com/time-and-fate) + - Fix the issue that changing the join order sequence might cause the planner to fail [#61715](https://github.com/pingcap/tidb/issues/61715) @[hawkingrei](https://github.com/hawkingrei) + - Fix the issue that using `set_var` hint with bindings prevents restoring the original variable settings [#59822](https://github.com/pingcap/tidb/issues/59822) @[wddevries](https://github.com/wddevries) + - Fix the issue that setting `ONLY_FULL_GROUP_BY` to a negative value causes validation failure [#62617](https://github.com/pingcap/tidb/issues/62617) @[AilinKid](https://github.com/AilinKid) + - Fix the issue that the `ONLY_FULL_GROUP_BY` check is case-insensitive [#62672](https://github.com/pingcap/tidb/issues/62672) @[AilinKid](https://github.com/AilinKid) + - Fix the issue that the DP join order algorithm might generate an incorrect plan [#63353](https://github.com/pingcap/tidb/issues/63353) @[winoros](https://github.com/winoros) + - Fix the issue that rewriting an outer join to an inner join might produce incorrect results [#61327](https://github.com/pingcap/tidb/issues/61327) @[hawkingrei](https://github.com/hawkingrei) + - Fix the issue that query execution might trigger an internal panic [#58600](https://github.com/pingcap/tidb/issues/58600) @[Defined2014](https://github.com/Defined2014) + - Fix the issue that the global index might read incorrect data during certain `ALTER PARTITION` states [#64084](https://github.com/pingcap/tidb/pull/64084) @[mjonss](https://github.com/mjonss) + - Fix the issue that the global index might return incorrect results in some cases [#61083](https://github.com/pingcap/tidb/issues/61083) @[Defined2014](https://github.com/Defined2014) + - Fix the issue that `character_set_results` truncates incorrect characters instead of replacing them [#61085](https://github.com/pingcap/tidb/issues/61085) @[xhebox](https://github.com/xhebox) + - Fix the issue that running `ADD COLUMN` and `UPDATE` statements concurrently might cause errors [#60047](https://github.com/pingcap/tidb/issues/60047) @[L-maple](https://github.com/L-maple) + PD @@ -114,11 +114,11 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiFlash - - 修复当查询的列存储大量 `NULL` 值时，可能导致查询失败的问题 [#10340](https://github.com/pingcap/tiflash/issues/10340) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) - - 修复 TiFlash 消耗超过预期的 RU 的问题 [#10380](https://github.com/pingcap/tiflash/issues/10380) @[JinheLin](https://github.com/JinheLin) - - 修复存算分离架构下，在存在慢查询时 TiFlash 容易发生 OOM 的问题 [#10278](https://github.com/pingcap/tiflash/issues/10278) @[JaySon-Huang](https://github.com/JaySon-Huang) - - 修复存算分离架构下，TiFlash 遇到与 S3 网络分区时可能无限重试的问题 [#10424](https://github.com/pingcap/tiflash/issues/10424) @[JaySon-Huang](https://github.com/JaySon-Huang) - - 修复了当参数为 `decimal` 类型时，`floor` 和 `ceil` 函数结果可能不正确的问题 [#10365](https://github.com/pingcap/tidb/issues/10365) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) + - Fix the issue that queries might fail when the queried column contains a large number of NULL values [#10340](https://github.com/pingcap/tiflash/issues/10340) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) + - Fix the issue that TiFlash generates inaccurate statistics for RU consumption [#10380](https://github.com/pingcap/tiflash/issues/10380) @[JinheLin](https://github.com/JinheLin) + - Fix the issue that TiFlash might encounter OOM when slow queries occur under the disaggregated storage and compute architecture [#10278](https://github.com/pingcap/tiflash/issues/10278) @[JaySon-Huang](https://github.com/JaySon-Huang) + - Fix the issue that TiFlash might retry infinitely when it encounters an S3 network partition under the disaggregated storage and compute architecture [#10424](https://github.com/pingcap/tiflash/issues/10424) @[JaySon-Huang](https://github.com/JaySon-Huang) + - Fix the issue that the `FLOOR()` and `CEIL()` functions might return incorrect results when their parameters are of the `DECIMAL` type [#10365](https://github.com/pingcap/tiflash/issues/10365) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) + Tools From b0727db874e5c50bc9dee7ffa8d421d8b4c0fc3a Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Wed, 29 Oct 2025 10:56:48 +0800 Subject: [PATCH 14/55] Update releases/release-8.5.4.md --- releases/release-8.5.4.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index d76d141f11310..cb55ca8214ac7 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -18,6 +18,8 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). - New configuration items: [`gc.auto-compaction.check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#check-interval-new-in-v757), [`gc.auto-compaction.tombstone-num-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-num-threshold-new-in-v757), [`gc.auto-compaction.tombstone-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-percent-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-percent-threshold-new-in-v757), and [`gc.auto-compaction.bottommost-level-force`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#bottommost-level-force-new-in-v757). +- New system variable: [`tidb_stats_update_during_ddl`](/system-variables.md#tidb_stats_update_during_ddl) + ## Improvements + TiDB From 78738201842ed82586de9e8c0ef1282ac643d01a Mon Sep 17 00:00:00 2001 From: Aolin Date: Wed, 29 Oct 2025 11:41:29 +0800 Subject: [PATCH 15/55] update PD and TiCDC --- releases/release-8.5.4.md | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index cb55ca8214ac7..1d007a5cda541 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -52,9 +52,9 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + PD - - degrade some unecessary error log [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) - - upgrade the golang and dependent version[#9788](https://github.com/tikv/pd/issues/9788) @[JmPotato](https://github.com/JmPotato) - - support to distribute table feature, make scatter easier #[8986](https://github.com/tikv/pd/issues/8986) @[bufferflies](https://github.com/bufferflies) + - Reduce unnecessary error logs [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + - Upgrade the Golang version to 1.23.12 and update related dependencies [#9788](https://github.com/tikv/pd/issues/9788) @[JmPotato](https://github.com/JmPotato) + - Support scattering Regions at the table level to achieve balanced distribution across `scatter-role` and `engine` dimensions [#8986](https://github.com/tikv/pd/issues/8986) @[bufferflies](https://github.com/bufferflies) + TiFlash @@ -136,10 +136,10 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiCDC - - Fix the issue that configuring the column dispatcher with virtual columns might cause a panic. [#12241](https://github.com/pingcap/tiflow/issues/12241) @[wk989898](https://github.com/wk989898) - - Fix the issue that closing ddl puller might cause a panic. [#12244](https://github.com/pingcap/tiflow/issues/12244) @[wk989898](https://github.com/wk989898) - - Support discarding unsupported DDL by setting `ignore-txn-start-ts` in filter. [#12286](https://github.com/pingcap/tiflow/issues/12286) @[asddongmen](https://github.com/asddongmen) - - Fix the issue that using Azure Downstream might cause stuck. [#12277] (https://github.com/pingcap/tiflow/issues/12277) @[zurakutsia](https://github.com/zurakutsia) - - Fix the issue that `drop foreign key` is not replicated to downstream [#12328](https://github.com/pingcap/tiflow/issues/12328) @[3AceShowHand](https://github.com/3AceShowHand) - - Fix the panic issue when subscribe the region and meet rollback and prewrite entry [#19048](https://github.com/tikv/tikv/issues/19048) @[3AceShowHand](https://github.com/3AceShowHand) - - Fix a TiKV assertion panic [#18498](https://github.com/tikv/tikv/issues/18498) @[tharanga](https://github.com/tharanga) \ No newline at end of file + - Fix a panic that could occur when configuring a Column-type partition dispatcher that includes virtual columns [#12241](https://github.com/pingcap/tiflow/issues/12241) @[wk989898](https://github.com/wk989898) + - Fix a panic that could occur when closing the DDL puller [#12244](https://github.com/pingcap/tiflow/issues/12244) @[wk989898](https://github.com/wk989898) + - Support filtering unsupported DDL types through the `ignore-txn-start-ts` parameter in the `filter` configuration [#12286](https://github.com/pingcap/tiflow/issues/12286) @[asddongmen](https://github.com/asddongmen) + - Fix the issue that Changefeed tasks might get stuck when using Azure Blob Storage as the downstream [#12277](https://github.com/pingcap/tiflow/issues/12277) @[zurakutsia](https://github.com/zurakutsia) + - Fix the issue that `DROP FOREIGN KEY` DDL is not replicated to the downstream [#12328](https://github.com/pingcap/tiflow/issues/12328) @[3AceShowHand](https://github.com/3AceShowHand) + - Fix the issue that TiCDC might panic when encountering rollback and prewrite entries during Region subscription [#19048](https://github.com/tikv/tikv/issues/19048) @[3AceShowHand](https://github.com/3AceShowHand) + - Fix the issue that assertion errors in TiKV might cause TiCDC to panic [#18498](https://github.com/tikv/tikv/issues/18498) @[tharanga](https://github.com/tharanga) From 39414eda61b1ed11452cabc957394adb27821a4f Mon Sep 17 00:00:00 2001 From: Aolin Date: Wed, 29 Oct 2025 11:43:20 +0800 Subject: [PATCH 16/55] update Compatibility changes and TiDB --- releases/release-8.5.4.md | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 1d007a5cda541..26f3abf10bae3 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -20,25 +20,24 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - New system variable: [`tidb_stats_update_during_ddl`](/system-variables.md#tidb_stats_update_during_ddl) +- Add the `tidb_opt_enable_no_decorrelate_in_select` system variable to control whether to decorrelate subqueries in the `SELECT` list [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) + +- Add the `tidb_opt_enable_semi_join_rewrite` system variable to control whether to rewrite `EXISTS` subqueries [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) + ## Improvements + TiDB - (dup): release-9.0.0.md(beta.1) > # SQL 功能 * 支持对分区表的非唯一列创建全局索引 [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) - (dup): release-9.0.0.md(beta.1) > 改进提升> TiDB - 支持由 `IN` 子查询而来的 Semi Join 使用 `semi_join_rewrite` 的 Hint [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) - - 微调了参数 tidb_opt_ordering_index_selectivity_ratio 生效时的估算策略 [#62817](https://github.com/pingcap/tidb/issues/62817) @[terry1purcell](https://github.com/terry1purcell) - - 新增配置项 tidb_opt_enable_semi_join_rewrite 去控制 exists 子查询是否需要被改写 [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) - - 微调了优化器选择逻辑，在某些情况下新索引更容易被选中 [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) - - 优化了 NDV 较小的列的查询估算逻辑 [#61792](https://github.com/pingcap/tidb/issues/61792) @[terry1purcell](https://github.com/terry1purcell) - - 微调了 limit offset 出现在 Index Join 查询中的估算策略 [#45077](https://github.com/pingcap/tidb/issues/45077) @[qw4990](https://github.com/qw4990) - - 新增 session variable “tidb_opt_enable_no_decorrelate_in_select” 去控制 select list 中的子查询是否需要被解关联 [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) - - 优化了 Merge join 计算 cost 可能存在遗漏 filter 的情况 [#62917](https://github.com/pingcap/tidb/issues/62917) @[qw4990](https://github.com/qw4990) - - 优化了在统计信息收集不及时情况下，越界估算的策略 [#58068](https://github.com/pingcap/tidb/issues/58068) @[terry1purcell](https://github.com/terry1purcell) - - 在执行时间概览中添加 Backoff 时间以便调试 [#61441](https://github.com/pingcap/tidb/issues/61441) @[dbsid](https://github.com/dbsid) - - 在审计日志插件中添加语句 ID 信息 [#63525](https://github.com/pingcap/tidb/issues/63525) @[YangKeao](https://github.com/YangKeao) - - 为审计日志插件添加缓冲日志支持：[#63650](https://github.com/pingcap/tidb/issues/63650) @[bb7133](https://github.com/bb7133) - - instance.plugin_audit_log_flush_interval：刷新缓冲审计日志的时间间隔 - - instance.plugin_audit_log_buffer_size：插件审计日志的缓冲区大小（字节），默认值为 0（不使用缓冲） + - Optimize the estimation strategy when the `tidb_opt_ordering_index_selectivity_ratio` system variable takes effect [#62817](https://github.com/pingcap/tidb/issues/62817) @[terry1purcell](https://github.com/terry1purcell) + - Adjust the optimizer selection logic to make newly created indexes more likely to be chosen in certain scenarios [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) + - Optimize the query estimation logic for columns with a small NDV (number of distinct values) [#61792](https://github.com/pingcap/tidb/issues/61792) @[terry1purcell](https://github.com/terry1purcell) + - Optimize the estimation strategy for Index Join queries that include `LIMIT OFFSET` [#45077](https://github.com/pingcap/tidb/issues/45077) @[qw4990](https://github.com/qw4990) + - Optimize the scenario where Merge Join might miss filter conditions when calculating costs [#62917](https://github.com/pingcap/tidb/issues/62917) @[qw4990](https://github.com/qw4990) + - Optimize the out-of-range estimation strategy when statistics are not collected in time [#58068](https://github.com/pingcap/tidb/issues/58068) @[terry1purcell](https://github.com/terry1purcell) + - Add the backoff time metric to the execution time overview to facilitate debugging [#61441](https://github.com/pingcap/tidb/issues/61441) @[dbsid](https://github.com/dbsid) + - Add statement ID information to the audit log plugin [#63525](https://github.com/pingcap/tidb/issues/63525) @[YangKeao](https://github.com/YangKeao) + TiKV From 3d21156bcc72912e53b961e580c973be81bea76b Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Wed, 29 Oct 2025 15:38:16 +0800 Subject: [PATCH 17/55] Update releases/release-8.5.4.md --- releases/release-8.5.4.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 26f3abf10bae3..3e49f07933f3f 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -45,8 +45,8 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - 将 Raft 模块检查 GC 的流程拆分为两个阶段，提升 Region 冗余 MVCC 版本 GC 的效率。[#18695](https://github.com/tikv/tikv/issues/18695) @[v01dstar](https://github.com/v01dstar) - 基于 GC safe point 和 Rocksdb 的统计信息计算 MVCC 的冗余读，提升 compaction 的效率和准确性。[#18697](https://github.com/tikv/tikv/issues/18697) @[v01dstar](https://github.com/v01dstar) - 将部分 TiKV 的错误日志从 ERROR 级别调整为 WARN 级别，避免产生过多不必要的告警。[#18745](https://github.com/tikv/tikv/issues/18745) @[exit-code-1](https://github.com/exit-code-1) - - 将 Region MVCC 的 GC 处理逻辑改由 GC worker 线程执行，统一 GC 的处理逻辑。 [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) - - 优化 gRPC 线程池线程数量默认值的计算方式，将原来的固定数据调整为根据总的 CPU 配置动态计算，避免 gRPC 线程数量太小产生的性能瓶颈。 [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) + - Change the GC handling logic for Region MVCC to be executed by GC worker threads to make the GC processing workflow consistent [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) + - Optimize the calculation of the default gRPC thread pool size by making it dynamically based on total CPU cores instead of a fixed value, preventing performance bottlenecks caused by insufficient gRPC threads [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) - (dup): release-7.5.7.md > 改进提升> TiKV - 优化在存在大量 SST 文件的环境中 async snapshot 和 write 的尾延迟 [#18743](https://github.com/tikv/tikv/issues/18743) @[Connor1996](https://github.com/Connor1996) + PD From a4bd1d0c85823ca62c3ca25e6988c966aa0d259c Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Wed, 29 Oct 2025 15:38:36 +0800 Subject: [PATCH 18/55] Apply suggestions from code review --- releases/release-8.5.4.md | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 3e49f07933f3f..d6f311cde1626 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -41,10 +41,10 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiKV - - 将部分 BR 模块的可自动恢复的错误的日志级别从ERROR 调整为 WARN [#18493](https://github.com/tikv/tikv/issues/18493) @[YuJuncen](https://github.com/YuJuncen) - - 将 Raft 模块检查 GC 的流程拆分为两个阶段，提升 Region 冗余 MVCC 版本 GC 的效率。[#18695](https://github.com/tikv/tikv/issues/18695) @[v01dstar](https://github.com/v01dstar) - - 基于 GC safe point 和 Rocksdb 的统计信息计算 MVCC 的冗余读，提升 compaction 的效率和准确性。[#18697](https://github.com/tikv/tikv/issues/18697) @[v01dstar](https://github.com/v01dstar) - - 将部分 TiKV 的错误日志从 ERROR 级别调整为 WARN 级别，避免产生过多不必要的告警。[#18745](https://github.com/tikv/tikv/issues/18745) @[exit-code-1](https://github.com/exit-code-1) + - Change the log level of certain automatically recoverable errors in the BR module from `ERROR` to `WARN` to reduce unnecessary alerts [#18493](https://github.com/tikv/tikv/issues/18493) @[YuJuncen](https://github.com/YuJuncen) + - Change the log level of certain TiKV error messages from `ERROR` to `WARN` to reduce unnecessary alerts [#18745](https://github.com/tikv/tikv/issues/18745) @[exit-code-1](https://github.com/exit-code-1) + - Split the GC check process in the Raft module into two phases to improve the efficiency of redundant MVCC version GC in Regions [#18695](https://github.com/tikv/tikv/issues/18695) @[v01dstar](https://github.com/v01dstar) + - Calculate redundant MVCC reads based on GC safe points and RocksDB statistics to improve the efficiency and accuracy of compaction [#18697](https://github.com/tikv/tikv/issues/18697) @[v01dstar](https://github.com/v01dstar) - Change the GC handling logic for Region MVCC to be executed by GC worker threads to make the GC processing workflow consistent [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) - Optimize the calculation of the default gRPC thread pool size by making it dynamically based on total CPU cores instead of a fixed value, preventing performance bottlenecks caused by insufficient gRPC threads [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) - (dup): release-7.5.7.md > 改进提升> TiKV - 优化在存在大量 SST 文件的环境中 async snapshot 和 write 的尾延迟 [#18743](https://github.com/tikv/tikv/issues/18743) @[Connor1996](https://github.com/Connor1996) From ce19359ffc982048bfc61c4fc668ba48bc884bfe Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Thu, 30 Oct 2025 10:55:46 +0800 Subject: [PATCH 19/55] Apply suggestions from code review --- releases/release-8.5.4.md | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index d6f311cde1626..329e13df7924a 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -72,21 +72,21 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiDB - - 修复当 `tidb_isolation_read_engines` 设置为 "tiflash" 时，`use index` hint 无法生效的问题 [#60869](https://github.com/pingcap/tidb/issues/60869) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) - - 修复了 `max_execution_time` 对 `SELECT FOR UPDATE` 语句不生效的问题. [#62960](https://github.com/pingcap/tidb/issues/62960) @[ekexium](https://github.com/ekexium) + - Fix the issue that the `use index` hint does not take effect when `tidb_isolation_read_engines` is set to `tiflash` [#60869](https://github.com/pingcap/tidb/issues/60869) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) + - Fix the issue that `max_execution_time` does not take effect for `SELECT FOR UPDATE` statements [#62960](https://github.com/pingcap/tidb/issues/62960) @[ekexium](https://github.com/ekexium) - (dup): release-7.5.7.md > 错误修复> TiDB - 修复估算跨月或跨年的行数时，结果可能过分偏大的问题 [#50080](https://github.com/pingcap/tidb/issues/50080) @[terry1purcell](https://github.com/terry1purcell) - - 修复预处理语句中处理 decimal 与 mysql 不一致的问题 [#62602](https://github.com/pingcap/tidb/issues/62602) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) - - 修复 `truncate` 函数中短路径处理错误的问题 [#57608](https://github.com/pingcap/tidb/issues/57608) @[xzhangxian1008](https://github.com/xzhangxian1008) - - 修复当 `Out Of Quota For Local Temporary Space` 触发时，spill 文件可能未被全部删除的问题 [#63216](https://github.com/pingcap/tidb/issues/63216) @[xzhangxian1008](https://github.com/xzhangxian1008) - - 修复查询`INFORMATION_SCHEMA`表使用正则表达式过滤结果不正确的问题 [#62347](https://github.com/pingcap/tidb/issues/62347) @[River2000i](https://github.com/River2000i) - - 修复从 PD 获取 timestamp 异常时没有返回错误的问题 [#58871](https://github.com/pingcap/tidb/issues/58871) @[joechenrh](https://github.com/joechenrh) - - 修复modify column时，owner TiDB和非ownerTiDB查询数据不一致的问题 [#60264](https://github.com/pingcap/tidb/issues/60264) @[tangenta](https://github.com/tangenta) - - 修复动态调参后 `ADMIN ALTER DDL JOBS`显示参数不正确的问题 [#63201](https://github.com/pingcap/tidb/issues/63201) @[fzzf678](https://github.com/fzzf678) - - 修复通过事务加索引时GC savepoint 不推进的问题 [#62424](https://github.com/pingcap/tidb/issues/62424) @[wjhuang2016](https://github.com/wjhuang2016) - - 修复过大的 SST 文件 ingest 到 L0 中导致流控的问题 [#63466](https://github.com/pingcap/tidb/issues/63466) @[CbcWestwolf](https://github.com/CbcWestwolf) - - 修复当 CPU 和 memory 比例为 1:2 时阻塞 global sort 的问题 [#60951](https://github.com/pingcap/tidb/issues/60951) @[wjhuang2016](https://github.com/wjhuang2016) - - 修复超过 16 个 DXF 任务上限时无法 cancel pending 任务的问题 [#63896](https://github.com/pingcap/tidb/issues/63896) @[D3Hunter](https://github.com/D3Hunter) - - 修复cancel DXF任务后，其他任务无法退出的问题 [#63927](https://github.com/pingcap/tidb/issues/63927) @[D3Hunter](https://github.com/D3Hunter) + - Fix the issue that the handling of `Decimal` types in prepared statements is inconsistent with MySQL [#62602](https://github.com/pingcap/tidb/issues/62602) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) + - Fix the issue that the short path in the `TRUNCATE()` function is incorrectly processed [#57608](https://github.com/pingcap/tidb/issues/57608) @[xzhangxian1008](https://github.com/xzhangxian1008) + - Fix the issue that spilled files are not deleted when `Out Of Quota For Local Temporary Space` is triggered [#63216](https://github.com/pingcap/tidb/issues/63216) @[xzhangxian1008](https://github.com/xzhangxian1008) + - Fix the issue that queries using regular expressions on `INFORMATION_SCHEMA` tables might return incorrect results [#62347](https://github.com/pingcap/tidb/issues/62347) @[River2000i](https://github.com/River2000i) + - Fix the issue that TiDB does not return an error when it fails to get a timestamp from PD [#58871](https://github.com/pingcap/tidb/issues/58871) @[joechenrh](https://github.com/joechenrh) + - Fix the issue that query results differ between the owner TiDB and non-owner TiDB instances during executing `MODIFY COLUMN` statements [#60264](https://github.com/pingcap/tidb/issues/60264) @[tangenta](https://github.com/tangenta) + - Fix the issue that the `ADMIN ALTER DDL JOBS` statement displays incorrect parameters after dynamically changing the parameters [#63201](https://github.com/pingcap/tidb/issues/63201) @[fzzf678](https://github.com/fzzf678) + - Fix the issue that the GC safe point does not advance when adding an index within a transaction [#62424](https://github.com/pingcap/tidb/issues/62424) @[wjhuang2016](https://github.com/wjhuang2016) + - Fix the issue that ingesting large SST files into L0 triggers flow control [#63466](https://github.com/pingcap/tidb/issues/63466) @[CbcWestwolf](https://github.com/CbcWestwolf) + - Fix the issue that global sorting is blocked when the CPU-to-memory ratio is 1:2 [#60951](https://github.com/pingcap/tidb/issues/60951) @[wjhuang2016](https://github.com/wjhuang2016) + - Fix the issue that pending Distributed eXecution Framework (DXF) tasks cannot be canceled when the number of tasks exceeds 16 [#63896](https://github.com/pingcap/tidb/issues/63896) @[D3Hunter](https://github.com/D3Hunter) + - Fix the issue that after the DXF task is canceled, other tasks fail to exit [#63927](https://github.com/pingcap/tidb/issues/63927) @[D3Hunter](https://github.com/D3Hunter) - Fix the issue that enabling the `Apply` operator concurrency (`tidb_enable_parallel_apply = on`) causes plan generation failure due to a missing clone implementation [#59863](https://github.com/pingcap/tidb/issues/59863) @[hawkingrei](https://github.com/hawkingrei) - Fix the issue that using the `ATAN2` function might produce incorrect results [#60093](https://github.com/pingcap/tidb/issues/60093) @[guo-shaoge](https://github.com/guo-shaoge) - Fix the issue that `select 1 from duml` cannot use the instance-level plan cache [#63075](https://github.com/pingcap/tidb/issues/63075) @[time-and-fate](https://github.com/time-and-fate) From 63e70e90c45e983fa339b524622b2e4ef948102a Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Fri, 31 Oct 2025 16:24:42 +0800 Subject: [PATCH 20/55] remove duplicated #9013 --- releases/release-8.5.4.md | 1 - 1 file changed, 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 329e13df7924a..b5fcd78b70162 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -110,7 +110,6 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Fix the bucket split still work even if the bucket doesn't report #[9726](https://github.com/tikv/pd/issues/9726) @[bufferflies](https://github.com/bufferflies) - Fix the wrong token allocation of the resource manager #[9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) - Fix the placement rule revert after pd leader changed #[9602](https://github.com/tikv/pd/issues/9602) @[okJiang](https://github.com/okJiang) - - 修复 backoff 初始化错误问题 #[9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) - Fix the ttl configuration not work #[9343](https://github.com/tikv/pd/issues/9343) @[lhy1024](https://github.com/lhy1024) + TiFlash From 042a159748197799bfcc50f315c8ae7c4a4db96c Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Fri, 31 Oct 2025 16:46:29 +0800 Subject: [PATCH 21/55] Apply suggestions from code review --- releases/release-8.5.4.md | 37 +++++++++++++++++++------------------ 1 file changed, 19 insertions(+), 18 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index b5fcd78b70162..d1413044cd05e 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -57,10 +57,11 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiFlash - - 跳过不必要读取的数据，优化 TableScan 的读取性能 [#9875](https://github.com/pingcap/tiflash/issues/9875) @[gengliqi](https://github.com/gengliqi) - - 优化 TiFlash 在宽且稀疏的表上 TableScan 的性能 [#10361](https://github.com/pingcap/tiflash/issues/10361) @[JaySon-Huang](https://github.com/JaySon-Huang) - - 优化当集群存在大量表时，添加向量索引时的 TiFlash CPU 开销 [#10357](https://github.com/pingcap/tiflash/issues/10357) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) - - 减少不必要的处理 raft commands 时的日志 [#10467](https://github.com/pingcap/tiflash/issues/10467) @[JaySon-Huang](https://github.com/JaySon-Huang) + - Skip unnecessary data reads to improve `TableScan` performance [#9875](https://github.com/pingcap/tiflash/issues/9875) @[gengliqi](https://github.com/gengliqi) + - Optimize `TableScan` performance on wide tables with many columns and sparse data (that is, lots of `NULL` or empty values) in TiFlash [#10361](https://github.com/pingcap/tiflash/issues/10361) @[JaySon-Huang](https://github.com/JaySon-Huang) + - Reduce TiFlash CPU overhead caused by adding vector indexes in clusters with many tables [#10357](https://github.com/pingcap/tiflash/issues/10357) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) + - Minimize unnecessary log output when processing useless Raft commands to reduce log volume [#10467](https://github.com/pingcap/tiflash/issues/10467) @[JaySon-Huang](https://github.com/JaySon-Huang) + - Improve `TableScan` performance on small partitioned tables in TiFlash [#10487](https://github.com/pingcap/tiflash/issues/10487) @[JaySon-Huang](https://github.com/JaySon-Huang) + Tools @@ -104,13 +105,13 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + PD - - Fix PD Client initial strategy not work well [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) - - Fix the wrong APIS of the `/config` 和 `/members` [#9797](https://github.com/tikv/pd/issues/9797) @[lhy1024](https://github.com/lhy1024) - - Fix the handler way of the tso error #[9188](https://github.com/tikv/pd/issues/9188) @[Tema](https://github.com/Tema) - - Fix the bucket split still work even if the bucket doesn't report #[9726](https://github.com/tikv/pd/issues/9726) @[bufferflies](https://github.com/bufferflies) - - Fix the wrong token allocation of the resource manager #[9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) - - Fix the placement rule revert after pd leader changed #[9602](https://github.com/tikv/pd/issues/9602) @[okJiang](https://github.com/okJiang) - - Fix the ttl configuration not work #[9343](https://github.com/tikv/pd/issues/9343) @[lhy1024](https://github.com/lhy1024) + - Fix the issue that the PD Client retry strategy is not initialized correctly [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) + - Fix the issue that the TSO HTTP API `/config` and `/members` return incorrect output [#9797](https://github.com/tikv/pd/issues/9797) @[lhy1024](https://github.com/lhy1024) + - Fix the incorrect error handling logic of TSO Follower Proxy [#9188](https://github.com/tikv/pd/issues/9188) @[Tema](https://github.com/Tema) + - Fix the issue that splitting buckets still works even after the bucket does not report [#9726](https://github.com/tikv/pd/issues/9726) @[bufferflies](https://github.com/bufferflies) + - Fix the issue that the Resource Manager incorrectly allocates tokens, causing queries to be stuck [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) + - Fix the issue that Placement Rules do not take effect after PD leader switches [#9602](https://github.com/tikv/pd/issues/9602) @[okJiang](https://github.com/okJiang) + - Fix the issue that TTL configuration does not take effect [#9343](https://github.com/tikv/pd/issues/9343) @[lhy1024](https://github.com/lhy1024) + TiFlash @@ -124,13 +125,13 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + Backup & Restore (BR) - - Fix the issue where Zstd compression did not take effect in log backup, resulting in uncompressed output. [#18836](https://github.com/tikv/tikv/issues/18836) @[3pointer](https://github.com/3pointer) - - Fixed a bug that may cause flush operation slow in azure blob storage. [#18410](https://github.com/tikv/tikv/issues/18410) @[YuJuncen](https://github.com/YuJuncen) - - Fixed a bug that may cause `log truncate` panic when failed to delete file. [#63358](https://github.com/pingcap/tidb/issues/63358) @[YuJuncen](https://github.com/YuJuncen) - - Fixed a bug that may cause `stats_meta` be zero when checksumming disabled. [#60978](https://github.com/pingcap/tidb/issues/60978) @[Leavrth](https://github.com/Leavrth) - - Reduced chance of BR restore failure from S3-compatible storage when the S3 server limits bandwidth through traffic shaping. [#18846](https://github.com/tikv/tikv/issues/18846) @[kennytm](https://github.com/kennytm) - - Fix the issue that the log backup observer loses observation of a region. [#18243](https://github.com/tikv/tikv/issues/18243) @[Leavrth](https://github.com/Leavrth) - - Fixed a a bug that may cause `restore point` fail when there are some special sized table schemas. [#63663](https://github.com/pingcap/tidb/issues/63663) @[RidRisR](https://github.com/RidRisR) + - Fix the issue that zstd compression in log backup does not take effect, causing the output to remain uncompressed [#18836](https://github.com/tikv/tikv/issues/18836) @[3pointer](https://github.com/3pointer) + - Fix the issue that flushing might slow down when backing up data to Azure Blob Storage [#18410](https://github.com/tikv/tikv/issues/18410) @[YuJuncen](https://github.com/YuJuncen) + - Fix the issue that `log truncate` might occur when file deletion fails [#63358](https://github.com/pingcap/tidb/issues/63358) @[YuJuncen](https://github.com/YuJuncen) + - Fix the issue that setting `--checksum` to `false` during backup might result in an empty `stats_meta` table [#60978](https://github.com/pingcap/tidb/issues/60978) @[Leavrth](https://github.com/Leavrth) + - Reduce the possibility of BR failing to restore data from S3-compatible storage services when the bandwidth limits on these services are enabled [#18846](https://github.com/tikv/tikv/issues/18846) @[kennytm](https://github.com/kennytm) + - Fix the issue that `log backup observer` might lose the observation on a Region, resulting in incomplete backup data [#18243](https://github.com/tikv/tikv/issues/18243) @[Leavrth](https://github.com/Leavrth) + - Fix the issue that causes `restore point` creation to fail when backed-up tables includes certain special schemas [#63663](https://github.com/pingcap/tidb/issues/63663) @[RidRisR](https://github.com/RidRisR) + TiCDC From 9558fe24251f3fc043f85e8114a7e831db7dc851 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Fri, 31 Oct 2025 16:57:25 +0800 Subject: [PATCH 22/55] Update releases/release-8.5.4.md --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index d1413044cd05e..042dd7f2760ac 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -108,7 +108,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Fix the issue that the PD Client retry strategy is not initialized correctly [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) - Fix the issue that the TSO HTTP API `/config` and `/members` return incorrect output [#9797](https://github.com/tikv/pd/issues/9797) @[lhy1024](https://github.com/lhy1024) - Fix the incorrect error handling logic of TSO Follower Proxy [#9188](https://github.com/tikv/pd/issues/9188) @[Tema](https://github.com/Tema) - - Fix the issue that splitting buckets still works even after the bucket does not report [#9726](https://github.com/tikv/pd/issues/9726) @[bufferflies](https://github.com/bufferflies) + - Fix the issue that splitting buckets still works even after bucket reporting is disabled[#9726](https://github.com/tikv/pd/issues/9726) @[bufferflies](https://github.com/bufferflies) - Fix the issue that the Resource Manager incorrectly allocates tokens, causing queries to be stuck [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) - Fix the issue that Placement Rules do not take effect after PD leader switches [#9602](https://github.com/tikv/pd/issues/9602) @[okJiang](https://github.com/okJiang) - Fix the issue that TTL configuration does not take effect [#9343](https://github.com/tikv/pd/issues/9343) @[lhy1024](https://github.com/lhy1024) From 050d720312d0b92b3e5312986d814653e4d14e69 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Fri, 31 Oct 2025 16:57:51 +0800 Subject: [PATCH 23/55] Update releases/release-8.5.4.md --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 042dd7f2760ac..8ed9b0f7fc89d 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -108,7 +108,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Fix the issue that the PD Client retry strategy is not initialized correctly [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) - Fix the issue that the TSO HTTP API `/config` and `/members` return incorrect output [#9797](https://github.com/tikv/pd/issues/9797) @[lhy1024](https://github.com/lhy1024) - Fix the incorrect error handling logic of TSO Follower Proxy [#9188](https://github.com/tikv/pd/issues/9188) @[Tema](https://github.com/Tema) - - Fix the issue that splitting buckets still works even after bucket reporting is disabled[#9726](https://github.com/tikv/pd/issues/9726) @[bufferflies](https://github.com/bufferflies) + - Fix the issue that splitting buckets still works even after bucket reporting is disabled [#9726](https://github.com/tikv/pd/issues/9726) @[bufferflies](https://github.com/bufferflies) - Fix the issue that the Resource Manager incorrectly allocates tokens, causing queries to be stuck [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) - Fix the issue that Placement Rules do not take effect after PD leader switches [#9602](https://github.com/tikv/pd/issues/9602) @[okJiang](https://github.com/okJiang) - Fix the issue that TTL configuration does not take effect [#9343](https://github.com/tikv/pd/issues/9343) @[lhy1024](https://github.com/lhy1024) From 9edc943bda070a889ea3b580981a907aa485ec5c Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Mon, 3 Nov 2025 10:20:28 +0800 Subject: [PATCH 24/55] refine the description of #9343 --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 8ed9b0f7fc89d..18969ff58897f 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -111,7 +111,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Fix the issue that splitting buckets still works even after bucket reporting is disabled [#9726](https://github.com/tikv/pd/issues/9726) @[bufferflies](https://github.com/bufferflies) - Fix the issue that the Resource Manager incorrectly allocates tokens, causing queries to be stuck [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) - Fix the issue that Placement Rules do not take effect after PD leader switches [#9602](https://github.com/tikv/pd/issues/9602) @[okJiang](https://github.com/okJiang) - - Fix the issue that TTL configuration does not take effect [#9343](https://github.com/tikv/pd/issues/9343) @[lhy1024](https://github.com/lhy1024) + - Fix the issue that PD might fail to parse large numeric values in scientific notation, which consequently causes some TTL-related configurations to not take effect [#9343](https://github.com/tikv/pd/issues/9343) @[lhy1024](https://github.com/lhy1024) + TiFlash From 384c99c2b3ba733f5da938a53a32ebf6e01a4652 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Mon, 3 Nov 2025 14:16:20 +0800 Subject: [PATCH 25/55] add tidb_enable_binding_usage --- releases/release-8.5.4.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 18969ff58897f..bc4879c5cedee 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -20,6 +20,8 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - New system variable: [`tidb_stats_update_during_ddl`](/system-variables.md#tidb_stats_update_during_ddl) +- Add the [`tidb_enable_binding_usage`](/system-variables.md#tidb_enable_binding_usage-new-in-v854-and-v900) system variable to control whether to collect the usage statistics of SQL plan bindings [#63407](https://github.com/pingcap/tidb/issues/63407) @[hawkingrei](https://github.com/hawkingrei) + - Add the `tidb_opt_enable_no_decorrelate_in_select` system variable to control whether to decorrelate subqueries in the `SELECT` list [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) - Add the `tidb_opt_enable_semi_join_rewrite` system variable to control whether to rewrite `EXISTS` subqueries [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) From e8b671a607546c9eb8e52c522fbb36da8687952b Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Mon, 3 Nov 2025 14:53:03 +0800 Subject: [PATCH 26/55] Apply suggestions from code review --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index bc4879c5cedee..9e89641c2ceff 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -18,7 +18,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). - New configuration items: [`gc.auto-compaction.check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#check-interval-new-in-v757), [`gc.auto-compaction.tombstone-num-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-num-threshold-new-in-v757), [`gc.auto-compaction.tombstone-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-percent-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-percent-threshold-new-in-v757), and [`gc.auto-compaction.bottommost-level-force`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#bottommost-level-force-new-in-v757). -- New system variable: [`tidb_stats_update_during_ddl`](/system-variables.md#tidb_stats_update_during_ddl) +- Add the [`tidb_stats_update_during_ddl`](/system-variables.md#tidb_stats_update_during_ddl) system variable to control whether to enable the embedded Analyze for DDL [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) @[AilinKid](https://github.com/AilinKid) - Add the [`tidb_enable_binding_usage`](/system-variables.md#tidb_enable_binding_usage-new-in-v854-and-v900) system variable to control whether to collect the usage statistics of SQL plan bindings [#63407](https://github.com/pingcap/tidb/issues/63407) @[hawkingrei](https://github.com/hawkingrei) From 24a1ff40f1a69c8651e840bae032c68b3f7a381d Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Mon, 3 Nov 2025 15:03:40 +0800 Subject: [PATCH 27/55] Update releases/release-8.5.4.md --- releases/release-8.5.4.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 9e89641c2ceff..e668acc7928ea 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -18,6 +18,8 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). - New configuration items: [`gc.auto-compaction.check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#check-interval-new-in-v757), [`gc.auto-compaction.tombstone-num-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-num-threshold-new-in-v757), [`gc.auto-compaction.tombstone-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-percent-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-percent-threshold-new-in-v757), and [`gc.auto-compaction.bottommost-level-force`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#bottommost-level-force-new-in-v757). +- Starting from v8.5.4, the [`tidb_replica_read`](/system-variables.md#tidb_replica_read-new-in-v40) system variable only takes effect on read-only SQL statements. This change improves data read safety and reduces overlaps with other features [#62856](https://github.com/pingcap/tidb/issues/62856) @[you06](https://github.com/you06) + - Add the [`tidb_stats_update_during_ddl`](/system-variables.md#tidb_stats_update_during_ddl) system variable to control whether to enable the embedded Analyze for DDL [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) @[AilinKid](https://github.com/AilinKid) - Add the [`tidb_enable_binding_usage`](/system-variables.md#tidb_enable_binding_usage-new-in-v854-and-v900) system variable to control whether to collect the usage statistics of SQL plan bindings [#63407](https://github.com/pingcap/tidb/issues/63407) @[hawkingrei](https://github.com/hawkingrei) From 78a4dade10b6b4d4ff4e6354e1cf16ffd8753135 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Mon, 3 Nov 2025 15:41:23 +0800 Subject: [PATCH 28/55] add graceful_wait_shutdown_timeout --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index e668acc7928ea..0dd3b46d14087 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -27,7 +27,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Add the `tidb_opt_enable_no_decorrelate_in_select` system variable to control whether to decorrelate subqueries in the `SELECT` list [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) - Add the `tidb_opt_enable_semi_join_rewrite` system variable to control whether to rewrite `EXISTS` subqueries [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) - +- Add the TiFlash configuration item [`graceful_wait_shutdown_timeout`](https://docs.pingcap.com/tidb/v8.5/tiflash-configuration#graceful_wait_shutdown_timeout-new-in-v854) to control the maximum wait time when shutting down a TiFlash server [#10266](https://github.com/pingcap/tiflash/issues/10266) @[gengliqi](https://github.com/gengliqi) ## Improvements + TiDB From 938b854a6988752256bd9f9ca77f253ec3d10def Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Mon, 3 Nov 2025 17:27:33 +0800 Subject: [PATCH 29/55] Apply suggestions from code review Co-authored-by: Aolin --- releases/release-8.5.4.md | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 0dd3b46d14087..818cb71e6fe2b 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -15,14 +15,14 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - (dup): release-7.5.7.md > Compatibility changes - TiKV deprecates the following configuration items and replaces them with the new [`gc.auto-compaction`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file/#gcauto-compaction) configuration group, which controls automatic compaction behavior [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) - - Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). - - New configuration items: [`gc.auto-compaction.check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#check-interval-new-in-v757), [`gc.auto-compaction.tombstone-num-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-num-threshold-new-in-v757), [`gc.auto-compaction.tombstone-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-percent-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-percent-threshold-new-in-v757), and [`gc.auto-compaction.bottommost-level-force`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#bottommost-level-force-new-in-v757). +- Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). +- New configuration items: [`gc.auto-compaction.check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#check-interval-new-in-v757), [`gc.auto-compaction.tombstone-num-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-num-threshold-new-in-v757), [`gc.auto-compaction.tombstone-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-percent-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-percent-threshold-new-in-v757), and [`gc.auto-compaction.bottommost-level-force`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#bottommost-level-force-new-in-v757). - Starting from v8.5.4, the [`tidb_replica_read`](/system-variables.md#tidb_replica_read-new-in-v40) system variable only takes effect on read-only SQL statements. This change improves data read safety and reduces overlaps with other features [#62856](https://github.com/pingcap/tidb/issues/62856) @[you06](https://github.com/you06) - Add the [`tidb_stats_update_during_ddl`](/system-variables.md#tidb_stats_update_during_ddl) system variable to control whether to enable the embedded Analyze for DDL [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) @[AilinKid](https://github.com/AilinKid) -- Add the [`tidb_enable_binding_usage`](/system-variables.md#tidb_enable_binding_usage-new-in-v854-and-v900) system variable to control whether to collect the usage statistics of SQL plan bindings [#63407](https://github.com/pingcap/tidb/issues/63407) @[hawkingrei](https://github.com/hawkingrei) +- Add the [`tidb_enable_binding_usage`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_enable_binding_usage-new-in-v854) system variable to control whether to collect the usage statistics of SQL plan bindings [#63407](https://github.com/pingcap/tidb/issues/63407) @[hawkingrei](https://github.com/hawkingrei) - Add the `tidb_opt_enable_no_decorrelate_in_select` system variable to control whether to decorrelate subqueries in the `SELECT` list [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) @@ -110,7 +110,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + PD - Fix the issue that the PD Client retry strategy is not initialized correctly [#9013](https://github.com/tikv/pd/issues/9013) @[rleungx](https://github.com/rleungx) - - Fix the issue that the TSO HTTP API `/config` and `/members` return incorrect output [#9797](https://github.com/tikv/pd/issues/9797) @[lhy1024](https://github.com/lhy1024) + - Fix the issue that the TSO HTTP API `/config` and `/members` return incorrect results [#9797](https://github.com/tikv/pd/issues/9797) @[lhy1024](https://github.com/lhy1024) - Fix the incorrect error handling logic of TSO Follower Proxy [#9188](https://github.com/tikv/pd/issues/9188) @[Tema](https://github.com/Tema) - Fix the issue that splitting buckets still works even after bucket reporting is disabled [#9726](https://github.com/tikv/pd/issues/9726) @[bufferflies](https://github.com/bufferflies) - Fix the issue that the Resource Manager incorrectly allocates tokens, causing queries to be stuck [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) @@ -135,7 +135,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Fix the issue that setting `--checksum` to `false` during backup might result in an empty `stats_meta` table [#60978](https://github.com/pingcap/tidb/issues/60978) @[Leavrth](https://github.com/Leavrth) - Reduce the possibility of BR failing to restore data from S3-compatible storage services when the bandwidth limits on these services are enabled [#18846](https://github.com/tikv/tikv/issues/18846) @[kennytm](https://github.com/kennytm) - Fix the issue that `log backup observer` might lose the observation on a Region, resulting in incomplete backup data [#18243](https://github.com/tikv/tikv/issues/18243) @[Leavrth](https://github.com/Leavrth) - - Fix the issue that causes `restore point` creation to fail when backed-up tables includes certain special schemas [#63663](https://github.com/pingcap/tidb/issues/63663) @[RidRisR](https://github.com/RidRisR) + - Fix the issue that causes `restore point` creation to fail when backed-up tables include certain special schemas [#63663](https://github.com/pingcap/tidb/issues/63663) @[RidRisR](https://github.com/RidRisR) + TiCDC From c47dcd26bccb4905aaf54a15a23a94f2262f8e22 Mon Sep 17 00:00:00 2001 From: Aolin Date: Mon, 3 Nov 2025 17:36:48 +0800 Subject: [PATCH 30/55] Apply suggestions from code review Co-authored-by: Grace Cai --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 818cb71e6fe2b..d7b6451e06c03 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -32,7 +32,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiDB - - (dup): release-9.0.0.md(beta.1) > # SQL 功能 * 支持对分区表的非唯一列创建全局索引 [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) + - (dup): release-9.0.0.md(beta.1) > # SQL 功能 - 支持对分区表的非唯一列创建[全局索引](/partitioned-table.md#全局索引)，以提升全局索引的易用性 [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) - (dup): release-9.0.0.md(beta.1) > 改进提升> TiDB - 支持由 `IN` 子查询而来的 Semi Join 使用 `semi_join_rewrite` 的 Hint [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) - Optimize the estimation strategy when the `tidb_opt_ordering_index_selectivity_ratio` system variable takes effect [#62817](https://github.com/pingcap/tidb/issues/62817) @[terry1purcell](https://github.com/terry1purcell) - Adjust the optimizer selection logic to make newly created indexes more likely to be chosen in certain scenarios [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) From 90331b11cb6d5ad5f38ac3bebe0d097cbba5c9ac Mon Sep 17 00:00:00 2001 From: Aolin Date: Mon, 3 Nov 2025 17:40:33 +0800 Subject: [PATCH 31/55] move 62917 from improvements to bug fixes --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index d7b6451e06c03..6deb1d924eac1 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -38,7 +38,6 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Adjust the optimizer selection logic to make newly created indexes more likely to be chosen in certain scenarios [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) - Optimize the query estimation logic for columns with a small NDV (number of distinct values) [#61792](https://github.com/pingcap/tidb/issues/61792) @[terry1purcell](https://github.com/terry1purcell) - Optimize the estimation strategy for Index Join queries that include `LIMIT OFFSET` [#45077](https://github.com/pingcap/tidb/issues/45077) @[qw4990](https://github.com/qw4990) - - Optimize the scenario where Merge Join might miss filter conditions when calculating costs [#62917](https://github.com/pingcap/tidb/issues/62917) @[qw4990](https://github.com/qw4990) - Optimize the out-of-range estimation strategy when statistics are not collected in time [#58068](https://github.com/pingcap/tidb/issues/58068) @[terry1purcell](https://github.com/terry1purcell) - Add the backoff time metric to the execution time overview to facilitate debugging [#61441](https://github.com/pingcap/tidb/issues/61441) @[dbsid](https://github.com/dbsid) - Add statement ID information to the audit log plugin [#63525](https://github.com/pingcap/tidb/issues/63525) @[YangKeao](https://github.com/YangKeao) @@ -106,6 +105,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Fix the issue that the global index might return incorrect results in some cases [#61083](https://github.com/pingcap/tidb/issues/61083) @[Defined2014](https://github.com/Defined2014) - Fix the issue that `character_set_results` truncates incorrect characters instead of replacing them [#61085](https://github.com/pingcap/tidb/issues/61085) @[xhebox](https://github.com/xhebox) - Fix the issue that running `ADD COLUMN` and `UPDATE` statements concurrently might cause errors [#60047](https://github.com/pingcap/tidb/issues/60047) @[L-maple](https://github.com/L-maple) + - Fix the issue that Merge Join might miss filter conditions when calculating costs [#62917](https://github.com/pingcap/tidb/issues/62917) @[qw4990](https://github.com/qw4990) + PD From 6c03c20e5cdf402d104d14849e20562a60859b72 Mon Sep 17 00:00:00 2001 From: Aolin Date: Mon, 3 Nov 2025 17:44:06 +0800 Subject: [PATCH 32/55] update links --- releases/release-8.5.4.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 6deb1d924eac1..ab56d12423a45 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -24,9 +24,9 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Add the [`tidb_enable_binding_usage`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_enable_binding_usage-new-in-v854) system variable to control whether to collect the usage statistics of SQL plan bindings [#63407](https://github.com/pingcap/tidb/issues/63407) @[hawkingrei](https://github.com/hawkingrei) -- Add the `tidb_opt_enable_no_decorrelate_in_select` system variable to control whether to decorrelate subqueries in the `SELECT` list [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) +- Add the [`tidb_opt_enable_no_decorrelate_in_select`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_no_decorrelate_in_select-new-in-v854) system variable to control whether to decorrelate subqueries in the `SELECT` list [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) -- Add the `tidb_opt_enable_semi_join_rewrite` system variable to control whether to rewrite `EXISTS` subqueries [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) +- Add the [`tidb_opt_enable_semi_join_rewrite`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_semi_join_rewrite-new-in-v854) system variable to control whether to rewrite `EXISTS` subqueries [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) - Add the TiFlash configuration item [`graceful_wait_shutdown_timeout`](https://docs.pingcap.com/tidb/v8.5/tiflash-configuration#graceful_wait_shutdown_timeout-new-in-v854) to control the maximum wait time when shutting down a TiFlash server [#10266](https://github.com/pingcap/tiflash/issues/10266) @[gengliqi](https://github.com/gengliqi) ## Improvements From 9dad458ac3cc5f29a062af5707a2b7a351f9ba12 Mon Sep 17 00:00:00 2001 From: Aolin Date: Mon, 3 Nov 2025 18:16:53 +0800 Subject: [PATCH 33/55] Apply suggestions from code review --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index ab56d12423a45..bc95666aa27df 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -55,7 +55,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + PD - Reduce unnecessary error logs [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) - - Upgrade the Golang version to 1.23.12 and update related dependencies [#9788](https://github.com/tikv/pd/issues/9788) @[JmPotato](https://github.com/JmPotato) + - Upgrade the Golang version from 1.23.0 to 1.23.12 and update related dependencies [#9788](https://github.com/tikv/pd/issues/9788) @[JmPotato](https://github.com/JmPotato) - Support scattering Regions at the table level to achieve balanced distribution across `scatter-role` and `engine` dimensions [#8986](https://github.com/tikv/pd/issues/8986) @[bufferflies](https://github.com/bufferflies) + TiFlash From 25a23127163981bdd764e88ad62de07a8c1ed8ef Mon Sep 17 00:00:00 2001 From: Aolin Date: Mon, 3 Nov 2025 18:21:36 +0800 Subject: [PATCH 34/55] Apply suggestions from code review --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index bc95666aa27df..57249dddbd10f 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -39,7 +39,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Optimize the query estimation logic for columns with a small NDV (number of distinct values) [#61792](https://github.com/pingcap/tidb/issues/61792) @[terry1purcell](https://github.com/terry1purcell) - Optimize the estimation strategy for Index Join queries that include `LIMIT OFFSET` [#45077](https://github.com/pingcap/tidb/issues/45077) @[qw4990](https://github.com/qw4990) - Optimize the out-of-range estimation strategy when statistics are not collected in time [#58068](https://github.com/pingcap/tidb/issues/58068) @[terry1purcell](https://github.com/terry1purcell) - - Add the backoff time metric to the execution time overview to facilitate debugging [#61441](https://github.com/pingcap/tidb/issues/61441) @[dbsid](https://github.com/dbsid) + - Add the `backoff` metric to the **Performance Overview** > **SQL Execute Time Overview** panel in Grafana to facilitate debugging [#61441](https://github.com/pingcap/tidb/issues/61441) @[dbsid](https://github.com/dbsid) - Add statement ID information to the audit log plugin [#63525](https://github.com/pingcap/tidb/issues/63525) @[YangKeao](https://github.com/YangKeao) + TiKV From 73178ee2495d7caa1b7340bceb57433b46807cef Mon Sep 17 00:00:00 2001 From: qiancai Date: Tue, 4 Nov 2025 13:57:36 +0800 Subject: [PATCH 35/55] reorder items in compatibility changes --- releases/release-8.5.4.md | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 57249dddbd10f..4e60ee367e3a5 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -13,21 +13,26 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ## Compatibility changes -- (dup): release-7.5.7.md > Compatibility changes - TiKV deprecates the following configuration items and replaces them with the new [`gc.auto-compaction`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file/#gcauto-compaction) configuration group, which controls automatic compaction behavior [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) +### System variables -- Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). -- New configuration items: [`gc.auto-compaction.check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#check-interval-new-in-v757), [`gc.auto-compaction.tombstone-num-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-num-threshold-new-in-v757), [`gc.auto-compaction.tombstone-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-percent-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-threshold-new-in-v757), [`gc.auto-compaction.redundant-rows-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-percent-threshold-new-in-v757), and [`gc.auto-compaction.bottommost-level-force`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#bottommost-level-force-new-in-v757). +- Starting from v8.5.4, the [`tidb_replica_read`](/system-variables.md#tidb_replica_read-new-in-v40) system variable only takes effect on read-only SQL statements. This change improves data read safety and reduces overlaps with other features. [#62856](https://github.com/pingcap/tidb/issues/62856) @[you06](https://github.com/you06) -- Starting from v8.5.4, the [`tidb_replica_read`](/system-variables.md#tidb_replica_read-new-in-v40) system variable only takes effect on read-only SQL statements. This change improves data read safety and reduces overlaps with other features [#62856](https://github.com/pingcap/tidb/issues/62856) @[you06](https://github.com/you06) +- Add the following system variables: -- Add the [`tidb_stats_update_during_ddl`](/system-variables.md#tidb_stats_update_during_ddl) system variable to control whether to enable the embedded Analyze for DDL [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) @[AilinKid](https://github.com/AilinKid) + - [`tidb_enable_binding_usage`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_enable_binding_usage-new-in-v854): controls whether to collect the usage statistics of SQL plan bindings. The default value is `OFF`. [#63407](https://github.com/pingcap/tidb/issues/63407) @[hawkingrei](https://github.com/hawkingrei) + - [`tidb_opt_enable_no_decorrelate_in_select`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_no_decorrelate_in_select-new-in-v854): controls whether to decorrelate subqueries in the `SELECT` list.The default value is `OFF`. [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) + - [`tidb_opt_enable_semi_join_rewrite`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_semi_join_rewrite-new-in-v854): controls whether to rewrite `EXISTS` subqueries.The default value is `OFF`. [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) + - [`tidb_stats_update_during_ddl`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_stats_update_during_ddl-new-in-v854): controls whether to enable the embedded Analyze for DDL. The default value is `OFF`. [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) @[AilinKid](https://github.com/AilinKid) -- Add the [`tidb_enable_binding_usage`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_enable_binding_usage-new-in-v854) system variable to control whether to collect the usage statistics of SQL plan bindings [#63407](https://github.com/pingcap/tidb/issues/63407) @[hawkingrei](https://github.com/hawkingrei) +### Configuration parameters -- Add the [`tidb_opt_enable_no_decorrelate_in_select`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_no_decorrelate_in_select-new-in-v854) system variable to control whether to decorrelate subqueries in the `SELECT` list [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) +- (dup): release-7.5.7.md > Compatibility changes - Deprecate the following TiKV configuration items and replace them with the new [`gc.auto-compaction`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file/#gcauto-compaction) configuration group, which controls automatic compaction behavior. [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) + + - Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). + - New configuration items: [`gc.auto-compaction.check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#check-interval-new-in-v757-and-v854), [`gc.auto-compaction.tombstone-num-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-num-threshold-new-in-v757-and-v854), [`gc.auto-compaction.tombstone-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-percent-threshold-new-in-v757-and-v854), [`gc.auto-compaction.redundant-rows-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-threshold-new-in-v757-and-v854), [`gc.auto-compaction.redundant-rows-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-percent-threshold-new-in-v757-and-v854), and [`gc.auto-compaction.bottommost-level-force`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#bottommost-level-force-new-in-v757-and-v854). + +- Add a TiFlash configuration item [`graceful_wait_shutdown_timeout`](https://docs.pingcap.com/tidb/v8.5/tiflash-configuration#graceful_wait_shutdown_timeout-new-in-v854), which controls the maximum wait time when shutting down a TiFlash server. The default value is `600` seconds. During this period, TiFlash continues running unfinished MPP tasks but does not accept new ones. If all running MPP tasks finish before this timeout, TiFlash shuts down immediately; otherwise, it is forcibly shut down after the wait time expires. [#10266](https://github.com/pingcap/tiflash/issues/10266) @[gengliqi](https://github.com/gengliqi) -- Add the [`tidb_opt_enable_semi_join_rewrite`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_semi_join_rewrite-new-in-v854) system variable to control whether to rewrite `EXISTS` subqueries [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) -- Add the TiFlash configuration item [`graceful_wait_shutdown_timeout`](https://docs.pingcap.com/tidb/v8.5/tiflash-configuration#graceful_wait_shutdown_timeout-new-in-v854) to control the maximum wait time when shutting down a TiFlash server [#10266](https://github.com/pingcap/tiflash/issues/10266) @[gengliqi](https://github.com/gengliqi) ## Improvements + TiDB From 0e47870f1c472af0bc3f34cca98560f1215caa90 Mon Sep 17 00:00:00 2001 From: qiancai Date: Tue, 4 Nov 2025 14:09:12 +0800 Subject: [PATCH 36/55] update BR bug fix descriptions according to zh changes --- releases/release-8.5.4.md | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 4e60ee367e3a5..87e67c9337fe0 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -135,11 +135,11 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + Backup & Restore (BR) - Fix the issue that zstd compression in log backup does not take effect, causing the output to remain uncompressed [#18836](https://github.com/tikv/tikv/issues/18836) @[3pointer](https://github.com/3pointer) - - Fix the issue that flushing might slow down when backing up data to Azure Blob Storage [#18410](https://github.com/tikv/tikv/issues/18410) @[YuJuncen](https://github.com/YuJuncen) + - Fix the issue that the flush operation occasionally becomes slow when backing up data to Azure Blob Storage [#18410](https://github.com/tikv/tikv/issues/18410) @[YuJuncen](https://github.com/YuJuncen) - Fix the issue that `log truncate` might occur when file deletion fails [#63358](https://github.com/pingcap/tidb/issues/63358) @[YuJuncen](https://github.com/YuJuncen) - - Fix the issue that setting `--checksum` to `false` during backup might result in an empty `stats_meta` table [#60978](https://github.com/pingcap/tidb/issues/60978) @[Leavrth](https://github.com/Leavrth) + - Fix the issue that setting `--checksum` to `false` during backup might cause the `count` column in the `mysql.stats_meta` table to become `0` after restore [#60978](https://github.com/pingcap/tidb/issues/60978) @[Leavrth](https://github.com/Leavrth) - Reduce the possibility of BR failing to restore data from S3-compatible storage services when the bandwidth limits on these services are enabled [#18846](https://github.com/tikv/tikv/issues/18846) @[kennytm](https://github.com/kennytm) - - Fix the issue that `log backup observer` might lose the observation on a Region, resulting in incomplete backup data [#18243](https://github.com/tikv/tikv/issues/18243) @[Leavrth](https://github.com/Leavrth) + - Fix the issue that `log backup observer` might lose the observation on a Region, causing the log backup progress to fail to advance [#18243](https://github.com/tikv/tikv/issues/18243) @[Leavrth](https://github.com/Leavrth) - Fix the issue that causes `restore point` creation to fail when backed-up tables include certain special schemas [#63663](https://github.com/pingcap/tidb/issues/63663) @[RidRisR](https://github.com/RidRisR) + TiCDC From 01367cb69113e74ad6f78386071e2227879255a6 Mon Sep 17 00:00:00 2001 From: qiancai Date: Tue, 4 Nov 2025 14:19:16 +0800 Subject: [PATCH 37/55] Update release-8.5.4.md --- releases/release-8.5.4.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 87e67c9337fe0..2b0579f6f9c8c 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -20,8 +20,8 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Add the following system variables: - [`tidb_enable_binding_usage`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_enable_binding_usage-new-in-v854): controls whether to collect the usage statistics of SQL plan bindings. The default value is `OFF`. [#63407](https://github.com/pingcap/tidb/issues/63407) @[hawkingrei](https://github.com/hawkingrei) - - [`tidb_opt_enable_no_decorrelate_in_select`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_no_decorrelate_in_select-new-in-v854): controls whether to decorrelate subqueries in the `SELECT` list.The default value is `OFF`. [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) - - [`tidb_opt_enable_semi_join_rewrite`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_semi_join_rewrite-new-in-v854): controls whether to rewrite `EXISTS` subqueries.The default value is `OFF`. [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) + - [`tidb_opt_enable_no_decorrelate_in_select`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_no_decorrelate_in_select-new-in-v854): controls whether to decorrelate subqueries in the `SELECT` list. The default value is `OFF`. [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) + - [`tidb_opt_enable_semi_join_rewrite`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_semi_join_rewrite-new-in-v854): controls whether to rewrite `EXISTS` subqueries. The default value is `OFF`. [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) - [`tidb_stats_update_during_ddl`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_stats_update_during_ddl-new-in-v854): controls whether to enable the embedded Analyze for DDL. The default value is `OFF`. [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) @[AilinKid](https://github.com/AilinKid) ### Configuration parameters From 70f326a2709aacb73c9699f8ccc04bc82899da19 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Tue, 4 Nov 2025 15:21:06 +0800 Subject: [PATCH 38/55] add #61826 --- releases/release-8.5.4.md | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 2b0579f6f9c8c..eac1395d28222 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -15,7 +15,9 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ### System variables -- Starting from v8.5.4, the [`tidb_replica_read`](/system-variables.md#tidb_replica_read-new-in-v40) system variable only takes effect on read-only SQL statements. This change improves data read safety and reduces overlaps with other features. [#62856](https://github.com/pingcap/tidb/issues/62856) @[you06](https://github.com/you06) +- Change the default value of the [`tidb_mpp_store_fail_ttl`](/system-variables.md#tidb_mpp_store_fail_ttl) system variable from `60s` to `0s`. This means TiDB no longer needs to wait before sending queries to newly started TiFlash nodes, as delays are no longer necessary to prevent query failures. [#61826](https://github.com/pingcap/tidb/issues/61826) @[gengliqi](https://github.com/gengliqi) + +- Starting from v8.5.4, the [`tidb_replica_read`](/system-variables.md#tidb_replica_read-new-in-v40) system variable only takes effect on read-only SQL statements. This change improves data read safety and reduces overlaps with other features. [#62856](https://github.com/pingcap/tidb/issues/62856) @[you06](https://github.com/you06) - Add the following system variables: @@ -33,6 +35,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Add a TiFlash configuration item [`graceful_wait_shutdown_timeout`](https://docs.pingcap.com/tidb/v8.5/tiflash-configuration#graceful_wait_shutdown_timeout-new-in-v854), which controls the maximum wait time when shutting down a TiFlash server. The default value is `600` seconds. During this period, TiFlash continues running unfinished MPP tasks but does not accept new ones. If all running MPP tasks finish before this timeout, TiFlash shuts down immediately; otherwise, it is forcibly shut down after the wait time expires. [#10266](https://github.com/pingcap/tiflash/issues/10266) @[gengliqi](https://github.com/gengliqi) + ## Improvements + TiDB From 91709c0973bc44f1dec671dcead9ac5a0cb8638c Mon Sep 17 00:00:00 2001 From: Aolin Date: Tue, 4 Nov 2025 15:55:01 +0800 Subject: [PATCH 39/55] Apply suggestions from code review Co-authored-by: Grace Cai --- releases/release-8.5.4.md | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index eac1395d28222..37c31698767f2 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -44,7 +44,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - (dup): release-9.0.0.md(beta.1) > 改进提升> TiDB - 支持由 `IN` 子查询而来的 Semi Join 使用 `semi_join_rewrite` 的 Hint [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) - Optimize the estimation strategy when the `tidb_opt_ordering_index_selectivity_ratio` system variable takes effect [#62817](https://github.com/pingcap/tidb/issues/62817) @[terry1purcell](https://github.com/terry1purcell) - Adjust the optimizer selection logic to make newly created indexes more likely to be chosen in certain scenarios [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) - - Optimize the query estimation logic for columns with a small NDV (number of distinct values) [#61792](https://github.com/pingcap/tidb/issues/61792) @[terry1purcell](https://github.com/terry1purcell) + - Optimize the query estimation logic for columns with a small number of distinct values (NDV) [#61792](https://github.com/pingcap/tidb/issues/61792) @[terry1purcell](https://github.com/terry1purcell) - Optimize the estimation strategy for Index Join queries that include `LIMIT OFFSET` [#45077](https://github.com/pingcap/tidb/issues/45077) @[qw4990](https://github.com/qw4990) - Optimize the out-of-range estimation strategy when statistics are not collected in time [#58068](https://github.com/pingcap/tidb/issues/58068) @[terry1purcell](https://github.com/terry1purcell) - Add the `backoff` metric to the **Performance Overview** > **SQL Execute Time Overview** panel in Grafana to facilitate debugging [#61441](https://github.com/pingcap/tidb/issues/61441) @[dbsid](https://github.com/dbsid) @@ -147,10 +147,10 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiCDC - - Fix a panic that could occur when configuring a Column-type partition dispatcher that includes virtual columns [#12241](https://github.com/pingcap/tiflow/issues/12241) @[wk989898](https://github.com/wk989898) + - Fix a panic that could occur when configuring a column-type partition dispatcher that includes virtual columns [#12241](https://github.com/pingcap/tiflow/issues/12241) @[wk989898](https://github.com/wk989898) - Fix a panic that could occur when closing the DDL puller [#12244](https://github.com/pingcap/tiflow/issues/12244) @[wk989898](https://github.com/wk989898) - Support filtering unsupported DDL types through the `ignore-txn-start-ts` parameter in the `filter` configuration [#12286](https://github.com/pingcap/tiflow/issues/12286) @[asddongmen](https://github.com/asddongmen) - - Fix the issue that Changefeed tasks might get stuck when using Azure Blob Storage as the downstream [#12277](https://github.com/pingcap/tiflow/issues/12277) @[zurakutsia](https://github.com/zurakutsia) + - Fix the issue that changefeed tasks might get stuck when using Azure Blob Storage as the downstream [#12277](https://github.com/pingcap/tiflow/issues/12277) @[zurakutsia](https://github.com/zurakutsia) - Fix the issue that `DROP FOREIGN KEY` DDL is not replicated to the downstream [#12328](https://github.com/pingcap/tiflow/issues/12328) @[3AceShowHand](https://github.com/3AceShowHand) - Fix the issue that TiCDC might panic when encountering rollback and prewrite entries during Region subscription [#19048](https://github.com/tikv/tikv/issues/19048) @[3AceShowHand](https://github.com/3AceShowHand) - Fix the issue that assertion errors in TiKV might cause TiCDC to panic [#18498](https://github.com/tikv/tikv/issues/18498) @[tharanga](https://github.com/tharanga) From 832ec7dece13a4227e84196739ff8edb2f5305b3 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Tue, 4 Nov 2025 16:56:14 +0800 Subject: [PATCH 40/55] add the issue for `DISTRIBUTE TABLE` --- releases/release-8.5.4.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 37c31698767f2..6256be7df0a5b 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -39,8 +39,8 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ## Improvements + TiDB - - - (dup): release-9.0.0.md(beta.1) > # SQL 功能 - 支持对分区表的非唯一列创建[全局索引](/partitioned-table.md#全局索引)，以提升全局索引的易用性 [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) + - Support redistributing data of a specific table (experimental). Now you can use the [`SHOW TABLE DISTRIBUTION`](/sql-statements/sql-statement-show-distribution-jobs.md) statement to check how the data of a specific table is distributed across all TiKV nodes. If the data distribution is unbalanced, you can use the [`DISTRIBUTE TABLE`](/sql-statements/sql-statement-distribute-table.md) statement to redistribute the table's data to improve load balancing. [#63260](https://github.com/pingcap/tidb/issues/63260) @[bufferflies](https://github.com/bufferflies) + - (dup): release-9.0.0.md(beta.1) > # SQL - Support creating [global indexes](/partitioned-table.md#global-indexes) on non-unique columns of partitioned tables, enhancing the usability of global indexes [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) - (dup): release-9.0.0.md(beta.1) > 改进提升> TiDB - 支持由 `IN` 子查询而来的 Semi Join 使用 `semi_join_rewrite` 的 Hint [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) - Optimize the estimation strategy when the `tidb_opt_ordering_index_selectivity_ratio` system variable takes effect [#62817](https://github.com/pingcap/tidb/issues/62817) @[terry1purcell](https://github.com/terry1purcell) - Adjust the optimizer selection logic to make newly created indexes more likely to be chosen in certain scenarios [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) From 29321768fcfb51dd4d1ddb2a053d10f4d795002e Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Tue, 4 Nov 2025 17:00:14 +0800 Subject: [PATCH 41/55] zh dup -> en dup --- releases/release-8.5.4.md | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 6256be7df0a5b..5f9f307ffc0e5 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -39,9 +39,10 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ## Improvements + TiDB + - Support redistributing data of a specific table (experimental). Now you can use the [`SHOW TABLE DISTRIBUTION`](/sql-statements/sql-statement-show-distribution-jobs.md) statement to check how the data of a specific table is distributed across all TiKV nodes. If the data distribution is unbalanced, you can use the [`DISTRIBUTE TABLE`](/sql-statements/sql-statement-distribute-table.md) statement to redistribute the table's data to improve load balancing. [#63260](https://github.com/pingcap/tidb/issues/63260) @[bufferflies](https://github.com/bufferflies) - (dup): release-9.0.0.md(beta.1) > # SQL - Support creating [global indexes](/partitioned-table.md#global-indexes) on non-unique columns of partitioned tables, enhancing the usability of global indexes [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) - - (dup): release-9.0.0.md(beta.1) > 改进提升> TiDB - 支持由 `IN` 子查询而来的 Semi Join 使用 `semi_join_rewrite` 的 Hint [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) + - (dup): release-9.0.0.md(beta.1) > Improvements> TiDB - Support applying the `semi_join_rewrite` hint to Semi Joins in `IN` subqueries [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) - Optimize the estimation strategy when the `tidb_opt_ordering_index_selectivity_ratio` system variable takes effect [#62817](https://github.com/pingcap/tidb/issues/62817) @[terry1purcell](https://github.com/terry1purcell) - Adjust the optimizer selection logic to make newly created indexes more likely to be chosen in certain scenarios [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) - Optimize the query estimation logic for columns with a small number of distinct values (NDV) [#61792](https://github.com/pingcap/tidb/issues/61792) @[terry1purcell](https://github.com/terry1purcell) @@ -58,7 +59,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Calculate redundant MVCC reads based on GC safe points and RocksDB statistics to improve the efficiency and accuracy of compaction [#18697](https://github.com/tikv/tikv/issues/18697) @[v01dstar](https://github.com/v01dstar) - Change the GC handling logic for Region MVCC to be executed by GC worker threads to make the GC processing workflow consistent [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) - Optimize the calculation of the default gRPC thread pool size by making it dynamically based on total CPU cores instead of a fixed value, preventing performance bottlenecks caused by insufficient gRPC threads [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) - - (dup): release-7.5.7.md > 改进提升> TiKV - 优化在存在大量 SST 文件的环境中 async snapshot 和 write 的尾延迟 [#18743](https://github.com/tikv/tikv/issues/18743) @[Connor1996](https://github.com/Connor1996) + - (dup): release-7.5.7.md > Improvements> TiKV - Optimize the tail latency of async snapshot and write operations in environments with a large number of SST files [#18743](https://github.com/tikv/tikv/issues/18743) @[Connor1996](https://github.com/Connor1996) + PD @@ -86,7 +87,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Fix the issue that the `use index` hint does not take effect when `tidb_isolation_read_engines` is set to `tiflash` [#60869](https://github.com/pingcap/tidb/issues/60869) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) - Fix the issue that `max_execution_time` does not take effect for `SELECT FOR UPDATE` statements [#62960](https://github.com/pingcap/tidb/issues/62960) @[ekexium](https://github.com/ekexium) - - (dup): release-7.5.7.md > 错误修复> TiDB - 修复估算跨月或跨年的行数时，结果可能过分偏大的问题 [#50080](https://github.com/pingcap/tidb/issues/50080) @[terry1purcell](https://github.com/terry1purcell) + - (dup): release-7.5.7.md > Bug fixes> TiDB - Fix the issue that row count estimates across months or years can be significantly overestimated [#50080](https://github.com/pingcap/tidb/issues/50080) @[terry1purcell](https://github.com/terry1purcell) - Fix the issue that the handling of `Decimal` types in prepared statements is inconsistent with MySQL [#62602](https://github.com/pingcap/tidb/issues/62602) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) - Fix the issue that the short path in the `TRUNCATE()` function is incorrectly processed [#57608](https://github.com/pingcap/tidb/issues/57608) @[xzhangxian1008](https://github.com/xzhangxian1008) - Fix the issue that spilled files are not deleted when `Out Of Quota For Local Temporary Space` is triggered [#63216](https://github.com/pingcap/tidb/issues/63216) @[xzhangxian1008](https://github.com/xzhangxian1008) From 9b761d2c291dbb0f0c9bc61a67e7752912b70021 Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Wed, 5 Nov 2025 12:33:34 +0800 Subject: [PATCH 42/55] Apply suggestions from code review Co-authored-by: Lilian Lee --- releases/release-8.5.4.md | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 5f9f307ffc0e5..0f7894a88601a 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -54,11 +54,11 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiKV - Change the log level of certain automatically recoverable errors in the BR module from `ERROR` to `WARN` to reduce unnecessary alerts [#18493](https://github.com/tikv/tikv/issues/18493) @[YuJuncen](https://github.com/YuJuncen) - - Change the log level of certain TiKV error messages from `ERROR` to `WARN` to reduce unnecessary alerts [#18745](https://github.com/tikv/tikv/issues/18745) @[exit-code-1](https://github.com/exit-code-1) - - Split the GC check process in the Raft module into two phases to improve the efficiency of redundant MVCC version GC in Regions [#18695](https://github.com/tikv/tikv/issues/18695) @[v01dstar](https://github.com/v01dstar) - - Calculate redundant MVCC reads based on GC safe points and RocksDB statistics to improve the efficiency and accuracy of compaction [#18697](https://github.com/tikv/tikv/issues/18697) @[v01dstar](https://github.com/v01dstar) - - Change the GC handling logic for Region MVCC to be executed by GC worker threads to make the GC processing workflow consistent [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) - - Optimize the calculation of the default gRPC thread pool size by making it dynamically based on total CPU cores instead of a fixed value, preventing performance bottlenecks caused by insufficient gRPC threads [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) + - Change the log level of certain TiKV errors from `ERROR` to `WARN` to reduce unnecessary alerts [#18745](https://github.com/tikv/tikv/issues/18745) @[exit-code-1](https://github.com/exit-code-1) + - Split the GC check process in the Raft module into two phases to improve the efficiency of garbage collection for redundant MVCC versions in Regions [#18695](https://github.com/tikv/tikv/issues/18695) @[v01dstar](https://github.com/v01dstar) + - Calculate MVCC redundancy based on GC safe points and RocksDB statistics to improve the efficiency and accuracy of compaction [#18697](https://github.com/tikv/tikv/issues/18697) @[v01dstar](https://github.com/v01dstar) + - Change the GC handling logic for Region MVCC to be executed by GC worker threads, unifying the overall GC processing logic [#18727](https://github.com/tikv/tikv/issues/18727) @[v01dstar](https://github.com/v01dstar) + - Optimize the calculation method of the default gRPC thread pool size by making it dynamically calculated based on total CPU quota instead of a fixed value, avoiding performance bottlenecks caused by insufficient gRPC threads [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) - (dup): release-7.5.7.md > Improvements> TiKV - Optimize the tail latency of async snapshot and write operations in environments with a large number of SST files [#18743](https://github.com/tikv/tikv/issues/18743) @[Connor1996](https://github.com/Connor1996) + PD @@ -79,7 +79,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiDB Data Migration (DM) - - Support case-insensitive compatibility when retrieving the upstream GTID_MODE [#12167](https://github.com/pingcap/tiflow/issues/12167) @[OliverS929](https://github.com/OliverS929) + - Support case-insensitive matching when retrieving the upstream `GTID_MODE` [#12167](https://github.com/pingcap/tiflow/issues/12167) @[OliverS929](https://github.com/OliverS929) ## Bug fixes @@ -128,10 +128,10 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiFlash - - Fix the issue that queries might fail when the queried column contains a large number of NULL values [#10340](https://github.com/pingcap/tiflash/issues/10340) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) + - Fix the issue that queries might fail when queried columns contain a large number of `NULL` values [#10340](https://github.com/pingcap/tiflash/issues/10340) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) - Fix the issue that TiFlash generates inaccurate statistics for RU consumption [#10380](https://github.com/pingcap/tiflash/issues/10380) @[JinheLin](https://github.com/JinheLin) - - Fix the issue that TiFlash might encounter OOM when slow queries occur under the disaggregated storage and compute architecture [#10278](https://github.com/pingcap/tiflash/issues/10278) @[JaySon-Huang](https://github.com/JaySon-Huang) - - Fix the issue that TiFlash might retry infinitely when it encounters an S3 network partition under the disaggregated storage and compute architecture [#10424](https://github.com/pingcap/tiflash/issues/10424) @[JaySon-Huang](https://github.com/JaySon-Huang) + - Fix the issue that TiFlash might encounter OOM when slow queries exist under the disaggregated storage and compute architecture [#10278](https://github.com/pingcap/tiflash/issues/10278) @[JaySon-Huang](https://github.com/JaySon-Huang) + - Fix the issue that TiFlash might retry indefinitely when a network partition occurrs between TiFlash and S3 under the disaggregated storage and compute architecture [#10424](https://github.com/pingcap/tiflash/issues/10424) @[JaySon-Huang](https://github.com/JaySon-Huang) - Fix the issue that the `FLOOR()` and `CEIL()` functions might return incorrect results when their parameters are of the `DECIMAL` type [#10365](https://github.com/pingcap/tiflash/issues/10365) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) + Tools From 15e8fa4e48ded58203373c6d9326eec65c1b4e26 Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Wed, 5 Nov 2025 12:36:52 +0800 Subject: [PATCH 43/55] Apply suggestions from code review Co-authored-by: Lilian Lee --- releases/release-8.5.4.md | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 0f7894a88601a..7a54229bc44e8 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -90,31 +90,31 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - (dup): release-7.5.7.md > Bug fixes> TiDB - Fix the issue that row count estimates across months or years can be significantly overestimated [#50080](https://github.com/pingcap/tidb/issues/50080) @[terry1purcell](https://github.com/terry1purcell) - Fix the issue that the handling of `Decimal` types in prepared statements is inconsistent with MySQL [#62602](https://github.com/pingcap/tidb/issues/62602) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) - Fix the issue that the short path in the `TRUNCATE()` function is incorrectly processed [#57608](https://github.com/pingcap/tidb/issues/57608) @[xzhangxian1008](https://github.com/xzhangxian1008) - - Fix the issue that spilled files are not deleted when `Out Of Quota For Local Temporary Space` is triggered [#63216](https://github.com/pingcap/tidb/issues/63216) @[xzhangxian1008](https://github.com/xzhangxian1008) - - Fix the issue that queries using regular expressions on `INFORMATION_SCHEMA` tables might return incorrect results [#62347](https://github.com/pingcap/tidb/issues/62347) @[River2000i](https://github.com/River2000i) + - Fix the issue that spilled files might not be fully deleted when the `Out Of Quota For Local Temporary Space` error is triggered [#63216](https://github.com/pingcap/tidb/issues/63216) @[xzhangxian1008](https://github.com/xzhangxian1008) + - Fix the issue that queries using regular expressions against `INFORMATION_SCHEMA` tables might return incorrect results [#62347](https://github.com/pingcap/tidb/issues/62347) @[River2000i](https://github.com/River2000i) - Fix the issue that TiDB does not return an error when it fails to get a timestamp from PD [#58871](https://github.com/pingcap/tidb/issues/58871) @[joechenrh](https://github.com/joechenrh) - Fix the issue that query results differ between the owner TiDB and non-owner TiDB instances during executing `MODIFY COLUMN` statements [#60264](https://github.com/pingcap/tidb/issues/60264) @[tangenta](https://github.com/tangenta) - - Fix the issue that the `ADMIN ALTER DDL JOBS` statement displays incorrect parameters after dynamically changing the parameters [#63201](https://github.com/pingcap/tidb/issues/63201) @[fzzf678](https://github.com/fzzf678) + - Fix the issue that `ADMIN ALTER DDL JOBS` statements display incorrect parameter values after dynamically modifying parameters [#63201](https://github.com/pingcap/tidb/issues/63201) @[fzzf678](https://github.com/fzzf678) - Fix the issue that the GC safe point does not advance when adding an index within a transaction [#62424](https://github.com/pingcap/tidb/issues/62424) @[wjhuang2016](https://github.com/wjhuang2016) - - Fix the issue that ingesting large SST files into L0 triggers flow control [#63466](https://github.com/pingcap/tidb/issues/63466) @[CbcWestwolf](https://github.com/CbcWestwolf) + - Fix the issue that ingesting excessively large SST files into L0 triggers flow control [#63466](https://github.com/pingcap/tidb/issues/63466) @[CbcWestwolf](https://github.com/CbcWestwolf) - Fix the issue that global sorting is blocked when the CPU-to-memory ratio is 1:2 [#60951](https://github.com/pingcap/tidb/issues/60951) @[wjhuang2016](https://github.com/wjhuang2016) - Fix the issue that pending Distributed eXecution Framework (DXF) tasks cannot be canceled when the number of tasks exceeds 16 [#63896](https://github.com/pingcap/tidb/issues/63896) @[D3Hunter](https://github.com/D3Hunter) - Fix the issue that after the DXF task is canceled, other tasks fail to exit [#63927](https://github.com/pingcap/tidb/issues/63927) @[D3Hunter](https://github.com/D3Hunter) - Fix the issue that enabling the `Apply` operator concurrency (`tidb_enable_parallel_apply = on`) causes plan generation failure due to a missing clone implementation [#59863](https://github.com/pingcap/tidb/issues/59863) @[hawkingrei](https://github.com/hawkingrei) - Fix the issue that using the `ATAN2` function might produce incorrect results [#60093](https://github.com/pingcap/tidb/issues/60093) @[guo-shaoge](https://github.com/guo-shaoge) - Fix the issue that `select 1 from duml` cannot use the instance-level plan cache [#63075](https://github.com/pingcap/tidb/issues/63075) @[time-and-fate](https://github.com/time-and-fate) - - Fix the issue that changing the join order sequence might cause the planner to fail [#61715](https://github.com/pingcap/tidb/issues/61715) @[hawkingrei](https://github.com/hawkingrei) - - Fix the issue that using `set_var` hint with bindings prevents restoring the original variable settings [#59822](https://github.com/pingcap/tidb/issues/59822) @[wddevries](https://github.com/wddevries) + - Fix the issue that changing the join order might cause the planner to fail [#61715](https://github.com/pingcap/tidb/issues/61715) @[hawkingrei](https://github.com/hawkingrei) + - Fix the issue that using the `set_var` hint with bindings prevents variables from being restored to their original settings [#59822](https://github.com/pingcap/tidb/issues/59822) @[wddevries](https://github.com/wddevries) - Fix the issue that setting `ONLY_FULL_GROUP_BY` to a negative value causes validation failure [#62617](https://github.com/pingcap/tidb/issues/62617) @[AilinKid](https://github.com/AilinKid) - Fix the issue that the `ONLY_FULL_GROUP_BY` check is case-insensitive [#62672](https://github.com/pingcap/tidb/issues/62672) @[AilinKid](https://github.com/AilinKid) - Fix the issue that the DP join order algorithm might generate an incorrect plan [#63353](https://github.com/pingcap/tidb/issues/63353) @[winoros](https://github.com/winoros) - Fix the issue that rewriting an outer join to an inner join might produce incorrect results [#61327](https://github.com/pingcap/tidb/issues/61327) @[hawkingrei](https://github.com/hawkingrei) - - Fix the issue that query execution might trigger an internal panic [#58600](https://github.com/pingcap/tidb/issues/58600) @[Defined2014](https://github.com/Defined2014) - - Fix the issue that the global index might read incorrect data during certain `ALTER PARTITION` states [#64084](https://github.com/pingcap/tidb/pull/64084) @[mjonss](https://github.com/mjonss) + - Fix the issue that executing certain queries might cause an internal panic [#58600](https://github.com/pingcap/tidb/issues/58600) @[Defined2014](https://github.com/Defined2014) + - Fix the issue that the global index might read incorrect data during certain `ALTER PARTITION` operations [#64084](https://github.com/pingcap/tidb/pull/64084) @[mjonss](https://github.com/mjonss) - Fix the issue that the global index might return incorrect results in some cases [#61083](https://github.com/pingcap/tidb/issues/61083) @[Defined2014](https://github.com/Defined2014) - Fix the issue that `character_set_results` truncates incorrect characters instead of replacing them [#61085](https://github.com/pingcap/tidb/issues/61085) @[xhebox](https://github.com/xhebox) - Fix the issue that running `ADD COLUMN` and `UPDATE` statements concurrently might cause errors [#60047](https://github.com/pingcap/tidb/issues/60047) @[L-maple](https://github.com/L-maple) - - Fix the issue that Merge Join might miss filter conditions when calculating costs [#62917](https://github.com/pingcap/tidb/issues/62917) @[qw4990](https://github.com/qw4990) + - Fix the issue that Merge Join might omit filter conditions when calculating costs [#62917](https://github.com/pingcap/tidb/issues/62917) @[qw4990](https://github.com/qw4990) + PD From 92594141f4eaab3938bdd91fcec5d5774ac407f9 Mon Sep 17 00:00:00 2001 From: lilin90 Date: Wed, 5 Nov 2025 13:49:41 +0800 Subject: [PATCH 44/55] Update format --- releases/release-8.5.4.md | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 7a54229bc44e8..781658553838c 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -35,7 +35,6 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Add a TiFlash configuration item [`graceful_wait_shutdown_timeout`](https://docs.pingcap.com/tidb/v8.5/tiflash-configuration#graceful_wait_shutdown_timeout-new-in-v854), which controls the maximum wait time when shutting down a TiFlash server. The default value is `600` seconds. During this period, TiFlash continues running unfinished MPP tasks but does not accept new ones. If all running MPP tasks finish before this timeout, TiFlash shuts down immediately; otherwise, it is forcibly shut down after the wait time expires. [#10266](https://github.com/pingcap/tiflash/issues/10266) @[gengliqi](https://github.com/gengliqi) - ## Improvements + TiDB @@ -100,7 +99,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Fix the issue that global sorting is blocked when the CPU-to-memory ratio is 1:2 [#60951](https://github.com/pingcap/tidb/issues/60951) @[wjhuang2016](https://github.com/wjhuang2016) - Fix the issue that pending Distributed eXecution Framework (DXF) tasks cannot be canceled when the number of tasks exceeds 16 [#63896](https://github.com/pingcap/tidb/issues/63896) @[D3Hunter](https://github.com/D3Hunter) - Fix the issue that after the DXF task is canceled, other tasks fail to exit [#63927](https://github.com/pingcap/tidb/issues/63927) @[D3Hunter](https://github.com/D3Hunter) - - Fix the issue that enabling the `Apply` operator concurrency (`tidb_enable_parallel_apply = on`) causes plan generation failure due to a missing clone implementation [#59863](https://github.com/pingcap/tidb/issues/59863) @[hawkingrei](https://github.com/hawkingrei) + - Fix the issue that enabling the `Apply` operator concurrency (`tidb_enable_parallel_apply = on`) causes plan generation failure due to a missing clone implementation [#59863](https://github.com/pingcap/tidb/issues/59863) @[hawkingrei](https://github.com/hawkingrei) - Fix the issue that using the `ATAN2` function might produce incorrect results [#60093](https://github.com/pingcap/tidb/issues/60093) @[guo-shaoge](https://github.com/guo-shaoge) - Fix the issue that `select 1 from duml` cannot use the instance-level plan cache [#63075](https://github.com/pingcap/tidb/issues/63075) @[time-and-fate](https://github.com/time-and-fate) - Fix the issue that changing the join order might cause the planner to fail [#61715](https://github.com/pingcap/tidb/issues/61715) @[hawkingrei](https://github.com/hawkingrei) @@ -132,7 +131,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Fix the issue that TiFlash generates inaccurate statistics for RU consumption [#10380](https://github.com/pingcap/tiflash/issues/10380) @[JinheLin](https://github.com/JinheLin) - Fix the issue that TiFlash might encounter OOM when slow queries exist under the disaggregated storage and compute architecture [#10278](https://github.com/pingcap/tiflash/issues/10278) @[JaySon-Huang](https://github.com/JaySon-Huang) - Fix the issue that TiFlash might retry indefinitely when a network partition occurrs between TiFlash and S3 under the disaggregated storage and compute architecture [#10424](https://github.com/pingcap/tiflash/issues/10424) @[JaySon-Huang](https://github.com/JaySon-Huang) - - Fix the issue that the `FLOOR()` and `CEIL()` functions might return incorrect results when their parameters are of the `DECIMAL` type [#10365](https://github.com/pingcap/tiflash/issues/10365) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) + - Fix the issue that the `FLOOR()` and `CEIL()` functions might return incorrect results when their parameters are of the `DECIMAL` type [#10365](https://github.com/pingcap/tiflash/issues/10365) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) + Tools From 79f3291558bfddaef5e297323b711b190a6d8672 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Thu, 6 Nov 2025 11:02:39 +0800 Subject: [PATCH 45/55] add TiCDC new architecture --- releases/release-8.5.4.md | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 781658553838c..3f3ca05505924 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -79,7 +79,15 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiDB Data Migration (DM) - Support case-insensitive matching when retrieving the upstream `GTID_MODE` [#12167](https://github.com/pingcap/tiflow/issues/12167) @[OliverS929](https://github.com/OliverS929) + + TiCDC + Introduce a [new TiCDC architecture option](/ticdc/ticdc-architecture.md) [#442](https://github.com/pingcap/ticdc/issues/442) @[CharlesCheung96](https://github.com/CharlesCheung96) + + This new architecture redesigns TiCDC core components and optimizes its data processing workflows, while maintaining compatibility with the configuration, usage, and APIs of the [classic TiCDC architecture](/ticdc/ticdc-classic-architecture), except for some [initial limitations](/ticdc/ticdc-architecture.md#limitations). When configured to use this new architecture, TiCDC achieves near-linear scalability and can replicate millions of tables with lower resource consumption. It also reduces changefeed latency and delivers more stable performance in scenarios with high write workloads, frequent DDL operations, and cluster scaling. + + To opt-in to use the new architecture, set the TiCDC configuration item [`newarch`](/ticdc/ticdc-server-config.md#newarch-new-in-v854-release1) to `true`. + + For more information, see [documentation](/ticdc/ticdc-architecture.md). ## Bug fixes + TiDB From d740165b94159d24ffd9c272d30cab55321e8e9d Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Thu, 6 Nov 2025 11:05:17 +0800 Subject: [PATCH 46/55] Update releases/release-8.5.4.md --- releases/release-8.5.4.md | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 3f3ca05505924..4ff99e99f0f1c 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -81,13 +81,15 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Support case-insensitive matching when retrieving the upstream `GTID_MODE` [#12167](https://github.com/pingcap/tiflow/issues/12167) @[OliverS929](https://github.com/OliverS929) + TiCDC - Introduce a [new TiCDC architecture option](/ticdc/ticdc-architecture.md) [#442](https://github.com/pingcap/ticdc/issues/442) @[CharlesCheung96](https://github.com/CharlesCheung96) + - Introduce a [new TiCDC architecture option](/ticdc/ticdc-architecture.md) [#442](https://github.com/pingcap/ticdc/issues/442) @[CharlesCheung96](https://github.com/CharlesCheung96) - This new architecture redesigns TiCDC core components and optimizes its data processing workflows, while maintaining compatibility with the configuration, usage, and APIs of the [classic TiCDC architecture](/ticdc/ticdc-classic-architecture), except for some [initial limitations](/ticdc/ticdc-architecture.md#limitations). When configured to use this new architecture, TiCDC achieves near-linear scalability and can replicate millions of tables with lower resource consumption. It also reduces changefeed latency and delivers more stable performance in scenarios with high write workloads, frequent DDL operations, and cluster scaling. + This new architecture redesigns TiCDC core components and optimizes its data processing workflows, while maintaining compatibility with the configuration, usage, and APIs of the [classic TiCDC architecture](/ticdc/ticdc-classic-architecture), except for some [initial limitations](/ticdc/ticdc-architecture.md#limitations). + + When configured to use this new architecture, TiCDC achieves near-linear scalability and can replicate millions of tables with lower resource consumption. It also reduces changefeed latency and delivers more stable performance in scenarios with high write workloads, frequent DDL operations, and cluster scaling. - To opt-in to use the new architecture, set the TiCDC configuration item [`newarch`](/ticdc/ticdc-server-config.md#newarch-new-in-v854-release1) to `true`. + To opt-in to use the new architecture, set the TiCDC configuration item [`newarch`](/ticdc/ticdc-server-config.md#newarch-new-in-v854-release1) to `true`. - For more information, see [documentation](/ticdc/ticdc-architecture.md). + For more information, see [documentation](/ticdc/ticdc-architecture.md). ## Bug fixes + TiDB From bbd0406170a0aec4fd7a78377a97ae07e85fdacc Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Thu, 6 Nov 2025 11:09:59 +0800 Subject: [PATCH 47/55] add a blank line --- releases/release-8.5.4.md | 1 + 1 file changed, 1 insertion(+) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 4ff99e99f0f1c..5f6d2dd385152 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -79,6 +79,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiDB Data Migration (DM) - Support case-insensitive matching when retrieving the upstream `GTID_MODE` [#12167](https://github.com/pingcap/tiflow/issues/12167) @[OliverS929](https://github.com/OliverS929) + + TiCDC - Introduce a [new TiCDC architecture option](/ticdc/ticdc-architecture.md) [#442](https://github.com/pingcap/ticdc/issues/442) @[CharlesCheung96](https://github.com/CharlesCheung96) From 1c7c6114cc5ca4d5f23c260b1084e433bf5d5fac Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Thu, 6 Nov 2025 13:46:53 +0800 Subject: [PATCH 48/55] Update releases/release-8.5.4.md --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 5f6d2dd385152..c7587e1a73e5a 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -139,7 +139,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiFlash - Fix the issue that queries might fail when queried columns contain a large number of `NULL` values [#10340](https://github.com/pingcap/tiflash/issues/10340) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) - - Fix the issue that TiFlash generates inaccurate statistics for RU consumption [#10380](https://github.com/pingcap/tiflash/issues/10380) @[JinheLin](https://github.com/JinheLin) + - Fix the issue that TiFlash generates inflated statistics for RU consumption [#10380](https://github.com/pingcap/tiflash/issues/10380) @[JinheLin](https://github.com/JinheLin) - Fix the issue that TiFlash might encounter OOM when slow queries exist under the disaggregated storage and compute architecture [#10278](https://github.com/pingcap/tiflash/issues/10278) @[JaySon-Huang](https://github.com/JaySon-Huang) - Fix the issue that TiFlash might retry indefinitely when a network partition occurrs between TiFlash and S3 under the disaggregated storage and compute architecture [#10424](https://github.com/pingcap/tiflash/issues/10424) @[JaySon-Huang](https://github.com/JaySon-Huang) - Fix the issue that the `FLOOR()` and `CEIL()` functions might return incorrect results when their parameters are of the `DECIMAL` type [#10365](https://github.com/pingcap/tiflash/issues/10365) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan) From f76079b8407c972bd07f50d2446a4bfbe6dadcc0 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Thu, 6 Nov 2025 14:11:50 +0800 Subject: [PATCH 49/55] remove tidb_enable_binding_usage --- releases/release-8.5.4.md | 1 - 1 file changed, 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index c7587e1a73e5a..7bb23dbe73f23 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -21,7 +21,6 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Add the following system variables: - - [`tidb_enable_binding_usage`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_enable_binding_usage-new-in-v854): controls whether to collect the usage statistics of SQL plan bindings. The default value is `OFF`. [#63407](https://github.com/pingcap/tidb/issues/63407) @[hawkingrei](https://github.com/hawkingrei) - [`tidb_opt_enable_no_decorrelate_in_select`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_no_decorrelate_in_select-new-in-v854): controls whether to decorrelate subqueries in the `SELECT` list. The default value is `OFF`. [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell) - [`tidb_opt_enable_semi_join_rewrite`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_opt_enable_semi_join_rewrite-new-in-v854): controls whether to rewrite `EXISTS` subqueries. The default value is `OFF`. [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell) - [`tidb_stats_update_during_ddl`](https://docs.pingcap.com/tidb/v8.5/system-variables#tidb_stats_update_during_ddl-new-in-v854): controls whether to enable the embedded Analyze for DDL. The default value is `OFF`. [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) @[AilinKid](https://github.com/AilinKid) From 1683ee542d9cda5f2347bac46ebb5c9547ec790e Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Thu, 6 Nov 2025 17:11:23 +0800 Subject: [PATCH 50/55] Update releases/release-8.5.4.md --- releases/release-8.5.4.md | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 7bb23dbe73f23..79d65c03633f1 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -81,11 +81,11 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- + TiCDC - - Introduce a [new TiCDC architecture option](/ticdc/ticdc-architecture.md) [#442](https://github.com/pingcap/ticdc/issues/442) @[CharlesCheung96](https://github.com/CharlesCheung96) + - Introduce a [new TiCDC architecture option](/ticdc/ticdc-architecture.md) for improved performance, scalability, and stability [#442](https://github.com/pingcap/ticdc/issues/442) @[CharlesCheung96](https://github.com/CharlesCheung96) - This new architecture redesigns TiCDC core components and optimizes its data processing workflows, while maintaining compatibility with the configuration, usage, and APIs of the [classic TiCDC architecture](/ticdc/ticdc-classic-architecture), except for some [initial limitations](/ticdc/ticdc-architecture.md#limitations). + This new architecture redesigns TiCDC core components and optimizes its data processing workflows, while maintaining compatibility with the configuration, usage, and APIs of the [classic TiCDC architecture](/ticdc/ticdc-classic-architecture). - When configured to use this new architecture, TiCDC achieves near-linear scalability and can replicate millions of tables with lower resource consumption. It also reduces changefeed latency and delivers more stable performance in scenarios with high write workloads, frequent DDL operations, and cluster scaling. + When configured to use this new architecture, TiCDC achieves near-linear scalability and can replicate millions of tables with lower resource consumption. It also reduces changefeed latency and delivers more stable performance in scenarios with high write workloads, frequent DDL operations, and cluster scaling. Note that the new architecture currently has some [initial limitations](/ticdc/ticdc-architecture.md#limitations). To opt-in to use the new architecture, set the TiCDC configuration item [`newarch`](/ticdc/ticdc-server-config.md#newarch-new-in-v854-release1) to `true`. From fd7ea3027dccee56cd582e197c4694d028301e42 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Tue, 11 Nov 2025 17:48:08 +0800 Subject: [PATCH 51/55] add `ANALYZE` embedded in DDL statements --- releases/release-8.5.4.md | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 79d65c03633f1..ba1a7a90d4ddf 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -34,11 +34,16 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Add a TiFlash configuration item [`graceful_wait_shutdown_timeout`](https://docs.pingcap.com/tidb/v8.5/tiflash-configuration#graceful_wait_shutdown_timeout-new-in-v854), which controls the maximum wait time when shutting down a TiFlash server. The default value is `600` seconds. During this period, TiFlash continues running unfinished MPP tasks but does not accept new ones. If all running MPP tasks finish before this timeout, TiFlash shuts down immediately; otherwise, it is forcibly shut down after the wait time expires. [#10266](https://github.com/pingcap/tiflash/issues/10266) @[gengliqi](https://github.com/gengliqi) +### MySQL compatibility + +Starting from v8.5.4, TiDB aligns its behavior with MySQL when inserting data into a `DECIMAL` column: if the number of decimal places exceeds the column's defined scale, TiDB automatically truncates the extra digits and inserts the truncated data successfully, regardless of how many extra decimal places there are. In earlier TiDB versions, if the number of decimal places in the inserted `DECIMAL` value exceeded 72, the insertion fails and returns an error. For more information, see [Connect to TiDB using JDBC](/develop/dev-guide-sample-application-java-jdbc.md#mysql-compatibility). + ## Improvements + TiDB - Support redistributing data of a specific table (experimental). Now you can use the [`SHOW TABLE DISTRIBUTION`](/sql-statements/sql-statement-show-distribution-jobs.md) statement to check how the data of a specific table is distributed across all TiKV nodes. If the data distribution is unbalanced, you can use the [`DISTRIBUTE TABLE`](/sql-statements/sql-statement-distribute-table.md) statement to redistribute the table's data to improve load balancing. [#63260](https://github.com/pingcap/tidb/issues/63260) @[bufferflies](https://github.com/bufferflies) + - Support [`ANALYZE` embedded in DDL statements](/ddl_embedded_analyze.md), which prevents inaccurate optimizer estimates and potential plan changes caused by temporarily unavailable statistics after index creation or reorganization [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) @[AilinKid](https://github.com/AilinKid) - (dup): release-9.0.0.md(beta.1) > # SQL - Support creating [global indexes](/partitioned-table.md#global-indexes) on non-unique columns of partitioned tables, enhancing the usability of global indexes [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) - (dup): release-9.0.0.md(beta.1) > Improvements> TiDB - Support applying the `semi_join_rewrite` hint to Semi Joins in `IN` subqueries [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) - Optimize the estimation strategy when the `tidb_opt_ordering_index_selectivity_ratio` system variable takes effect [#62817](https://github.com/pingcap/tidb/issues/62817) @[terry1purcell](https://github.com/terry1purcell) From e3d3cc1f8bd9fb00fbc42709cb8f2a8190d40ef3 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Wed, 12 Nov 2025 10:35:10 +0800 Subject: [PATCH 52/55] fix the format issue of variable links --- releases/release-8.5.4.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index ba1a7a90d4ddf..c7c47ccf96233 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -15,9 +15,9 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ### System variables -- Change the default value of the [`tidb_mpp_store_fail_ttl`](/system-variables.md#tidb_mpp_store_fail_ttl) system variable from `60s` to `0s`. This means TiDB no longer needs to wait before sending queries to newly started TiFlash nodes, as delays are no longer necessary to prevent query failures. [#61826](https://github.com/pingcap/tidb/issues/61826) @[gengliqi](https://github.com/gengliqi) +- Change the default value of the [`tidb_mpp_store_fail_ttl`](https://docs.pingcap.com/tidb/v8.5/system-variables/#tidb_mpp_store_fail_ttl) system variable from `60s` to `0s`. This means TiDB no longer needs to wait before sending queries to newly started TiFlash nodes, as delays are no longer necessary to prevent query failures. [#61826](https://github.com/pingcap/tidb/issues/61826) @[gengliqi](https://github.com/gengliqi) -- Starting from v8.5.4, the [`tidb_replica_read`](/system-variables.md#tidb_replica_read-new-in-v40) system variable only takes effect on read-only SQL statements. This change improves data read safety and reduces overlaps with other features. [#62856](https://github.com/pingcap/tidb/issues/62856) @[you06](https://github.com/you06) +- Starting from v8.5.4, the [`tidb_replica_read`](https://docs.pingcap.com/tidb/v8.5/system-variables/#tidb_replica_read-new-in-v40) system variable only takes effect on read-only SQL statements. This change improves data read safety and reduces overlaps with other features. [#62856](https://github.com/pingcap/tidb/issues/62856) @[you06](https://github.com/you06) - Add the following system variables: From 59e17baea8abacdbffc05688e07bf2812a549c41 Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Wed, 12 Nov 2025 10:35:58 +0800 Subject: [PATCH 53/55] Update releases/release-8.5.4.md --- releases/release-8.5.4.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index c7c47ccf96233..bf1675d9f40d7 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -15,7 +15,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ### System variables -- Change the default value of the [`tidb_mpp_store_fail_ttl`](https://docs.pingcap.com/tidb/v8.5/system-variables/#tidb_mpp_store_fail_ttl) system variable from `60s` to `0s`. This means TiDB no longer needs to wait before sending queries to newly started TiFlash nodes, as delays are no longer necessary to prevent query failures. [#61826](https://github.com/pingcap/tidb/issues/61826) @[gengliqi](https://github.com/gengliqi) +- Change the default value of the [`tidb_mpp_store_fail_ttl`](https://docs.pingcap.com/tidb/v8.5/system-variables/#tidb_mpp_store_fail_ttl) system variable from `60s` to `0s`. This means TiDB no longer needs to wait before sending queries to newly started TiFlash nodes, as delays are no longer necessary to prevent query failures. [#61826](https://github.com/pingcap/tidb/issues/61826) @[gengliqi](https://github.com/gengliqi) - Starting from v8.5.4, the [`tidb_replica_read`](https://docs.pingcap.com/tidb/v8.5/system-variables/#tidb_replica_read-new-in-v40) system variable only takes effect on read-only SQL statements. This change improves data read safety and reduces overlaps with other features. [#62856](https://github.com/pingcap/tidb/issues/62856) @[you06](https://github.com/you06) From fbd9973bbf3d2142e9974201c55e080e9669494d Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Wed, 12 Nov 2025 11:03:00 +0800 Subject: [PATCH 54/55] Apply suggestions from code review --- releases/release-8.5.4.md | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index bf1675d9f40d7..84b6eafb4b2db 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -15,9 +15,9 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- ### System variables -- Change the default value of the [`tidb_mpp_store_fail_ttl`](https://docs.pingcap.com/tidb/v8.5/system-variables/#tidb_mpp_store_fail_ttl) system variable from `60s` to `0s`. This means TiDB no longer needs to wait before sending queries to newly started TiFlash nodes, as delays are no longer necessary to prevent query failures. [#61826](https://github.com/pingcap/tidb/issues/61826) @[gengliqi](https://github.com/gengliqi) +- Change the default value of the [`tidb_mpp_store_fail_ttl`](https://docs.pingcap.com/tidb/v8.5/system-variables/#tidb_mpp_store_fail_ttl) system variable from `60s` to `0s`. This means TiDB no longer needs to wait before sending queries to newly started TiFlash nodes, as delays are no longer necessary to prevent query failures. [#61826](https://github.com/pingcap/tidb/issues/61826) @[gengliqi](https://github.com/gengliqi) -- Starting from v8.5.4, the [`tidb_replica_read`](https://docs.pingcap.com/tidb/v8.5/system-variables/#tidb_replica_read-new-in-v40) system variable only takes effect on read-only SQL statements. This change improves data read safety and reduces overlaps with other features. [#62856](https://github.com/pingcap/tidb/issues/62856) @[you06](https://github.com/you06) +- Starting from v8.5.4, the [`tidb_replica_read`](https://docs.pingcap.com/tidb/v8.5/system-variables/#tidb_replica_read-new-in-v40) system variable only takes effect on read-only SQL statements. This change improves data read safety and reduces overlaps with other features. [#62856](https://github.com/pingcap/tidb/issues/62856) @[you06](https://github.com/you06) - Add the following system variables: @@ -32,7 +32,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with- - Deprecated configuration items: [`region-compact-check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-interval), [`region-compact-check-step`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-check-step), [`region-compact-min-tombstones`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-tombstones), [`region-compact-tombstones-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-tombstones-percent), [`region-compact-min-redundant-rows`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-min-redundant-rows-new-in-v710), and [`region-compact-redundant-rows-percent`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#region-compact-redundant-rows-percent-new-in-v710). - New configuration items: [`gc.auto-compaction.check-interval`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#check-interval-new-in-v757-and-v854), [`gc.auto-compaction.tombstone-num-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-num-threshold-new-in-v757-and-v854), [`gc.auto-compaction.tombstone-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#tombstone-percent-threshold-new-in-v757-and-v854), [`gc.auto-compaction.redundant-rows-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-threshold-new-in-v757-and-v854), [`gc.auto-compaction.redundant-rows-percent-threshold`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#redundant-rows-percent-threshold-new-in-v757-and-v854), and [`gc.auto-compaction.bottommost-level-force`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#bottommost-level-force-new-in-v757-and-v854). -- Add a TiFlash configuration item [`graceful_wait_shutdown_timeout`](https://docs.pingcap.com/tidb/v8.5/tiflash-configuration#graceful_wait_shutdown_timeout-new-in-v854), which controls the maximum wait time when shutting down a TiFlash server. The default value is `600` seconds. During this period, TiFlash continues running unfinished MPP tasks but does not accept new ones. If all running MPP tasks finish before this timeout, TiFlash shuts down immediately; otherwise, it is forcibly shut down after the wait time expires. [#10266](https://github.com/pingcap/tiflash/issues/10266) @[gengliqi](https://github.com/gengliqi) +- Add a TiFlash configuration item [`graceful_wait_shutdown_timeout`](https://docs.pingcap.com/tidb/v8.5/tiflash-configuration#graceful_wait_shutdown_timeout-new-in-v854), which controls the maximum wait time when shutting down a TiFlash server. The default value is `600` seconds. During this period, TiFlash continues running unfinished MPP tasks but does not accept new ones. If all running MPP tasks finish before this timeout, TiFlash shuts down immediately; otherwise, it is forcibly shut down after the wait time expires. [#10266](https://github.com/pingcap/tiflash/issues/10266) @[gengliqi](https://github.com/gengliqi) ### MySQL compatibility @@ -44,7 +44,7 @@ Starting from v8.5.4, TiDB aligns its behavior with MySQL when inserting data in - Support redistributing data of a specific table (experimental). Now you can use the [`SHOW TABLE DISTRIBUTION`](/sql-statements/sql-statement-show-distribution-jobs.md) statement to check how the data of a specific table is distributed across all TiKV nodes. If the data distribution is unbalanced, you can use the [`DISTRIBUTE TABLE`](/sql-statements/sql-statement-distribute-table.md) statement to redistribute the table's data to improve load balancing. [#63260](https://github.com/pingcap/tidb/issues/63260) @[bufferflies](https://github.com/bufferflies) - Support [`ANALYZE` embedded in DDL statements](/ddl_embedded_analyze.md), which prevents inaccurate optimizer estimates and potential plan changes caused by temporarily unavailable statistics after index creation or reorganization [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) @[AilinKid](https://github.com/AilinKid) - - (dup): release-9.0.0.md(beta.1) > # SQL - Support creating [global indexes](/partitioned-table.md#global-indexes) on non-unique columns of partitioned tables, enhancing the usability of global indexes [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) + - (dup): release-9.0.0.md(beta.1) > # SQL - Support creating [global indexes](/partitioned-table.md#global-indexes) on non-unique columns of partitioned tables, enhancing the usability of global indexes [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss) - (dup): release-9.0.0.md(beta.1) > Improvements> TiDB - Support applying the `semi_join_rewrite` hint to Semi Joins in `IN` subqueries [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990) - Optimize the estimation strategy when the `tidb_opt_ordering_index_selectivity_ratio` system variable takes effect [#62817](https://github.com/pingcap/tidb/issues/62817) @[terry1purcell](https://github.com/terry1purcell) - Adjust the optimizer selection logic to make newly created indexes more likely to be chosen in certain scenarios [#57948](https://github.com/pingcap/tidb/issues/57948) @[terry1purcell](https://github.com/terry1purcell) From 70c8e7078d2cb55d3d9f183d9426befab360c0dc Mon Sep 17 00:00:00 2001 From: Grace Cai Date: Wed, 12 Nov 2025 11:04:44 +0800 Subject: [PATCH 55/55] add an empty line --- releases/release-8.5.4.md | 1 + 1 file changed, 1 insertion(+) diff --git a/releases/release-8.5.4.md b/releases/release-8.5.4.md index 84b6eafb4b2db..516023c8baf2b 100644 --- a/releases/release-8.5.4.md +++ b/releases/release-8.5.4.md @@ -95,6 +95,7 @@ Starting from v8.5.4, TiDB aligns its behavior with MySQL when inserting data in To opt-in to use the new architecture, set the TiCDC configuration item [`newarch`](/ticdc/ticdc-server-config.md#newarch-new-in-v854-release1) to `true`. For more information, see [documentation](/ticdc/ticdc-architecture.md). + ## Bug fixes + TiDB