From 162066e2d11b0ae8c2feca9c66f0b05f9a36afd0 Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Wed, 18 Mar 2026 18:04:33 +0800 Subject: [PATCH 01/10] Add temp.md --- temp.md | 1 + 1 file changed, 1 insertion(+) create mode 100644 temp.md diff --git a/temp.md b/temp.md new file mode 100644 index 0000000000000..af27ff4986a7b --- /dev/null +++ b/temp.md @@ -0,0 +1 @@ +This is a test file. \ No newline at end of file From b3318c00089edd758f5b431346eba705e0291faa Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Wed, 18 Mar 2026 18:04:39 +0800 Subject: [PATCH 02/10] Delete temp.md --- temp.md | 1 - 1 file changed, 1 deletion(-) delete mode 100644 temp.md diff --git a/temp.md b/temp.md deleted file mode 100644 index af27ff4986a7b..0000000000000 --- a/temp.md +++ /dev/null @@ -1 +0,0 @@ -This is a test file. \ No newline at end of file From fbd1b14b4c8a2175c76a9f1c6e030381f76270b0 Mon Sep 17 00:00:00 2001 From: "github-actions[bot]" Date: Wed, 18 Mar 2026 10:05:51 +0000 Subject: [PATCH 03/10] Auto-sync: Update English docs from Chinese PR Synced from: https://github.com/pingcap/docs-cn/pull/21445 Target PR: https://github.com/pingcap/docs/pull/22578 AI Provider: gemini Co-authored-by: github-actions[bot] --- releases/release-8.5.6.md | 147 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 147 insertions(+) create mode 100644 releases/release-8.5.6.md diff --git a/releases/release-8.5.6.md b/releases/release-8.5.6.md new file mode 100644 index 0000000000000..920a16aaa26be --- /dev/null +++ b/releases/release-8.5.6.md @@ -0,0 +1,147 @@ +--- +title: TiDB 8.5.6 Release Notes +summary: Understand the compatibility changes, improvements, and bug fixes in the TiDB 8.5.6 release. +--- + +# TiDB 8.5.6 Release Notes + +Release Date: 2026-xx-xx + +TiDB Version: 8.5.6 + +Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with-tidb) | [Production Deployment](https://docs.pingcap.com/zh/tidb/v8.5/production-deployment-using-tiup) | [Download Offline Package](https://pingkai.cn/download#tidb-community) + +## Feature Details + +### Stability + +- The ability to set resource limits for background tasks in Resource Control is now Generally Available (GA) [#56019](https://github.com/pingcap/tidb/issues/56019) @[glorv](https://github.com/glorv) + + TiDB Resource Control can identify and lower the priority of background tasks. In some scenarios, even with idle resources, users may want to keep the consumption of background tasks at a very low level. Starting from v8.4.0, you can use the `UTILIZATION_LIMIT` parameter to set the maximum percentage of resources that background tasks under Resource Control can use, controlling the usage of all background tasks on each node below this percentage. This feature allows you to finely control the resource consumption of background tasks, further enhancing cluster stability. + + In v8.5.6, this feature is Generally Available (GA). + + For more information, please refer to the [User Documentation](/tidb-resource-control-background-tasks.md). + +### Data Migration + +- (dup): release-9.0.0.md > # Data Migration * Migrated sync-diff-inspector from the `pingcap/tidb-tools` repository to the `pingcap/tiflow` repository [#11672](https://github.com/pingcap/tiflow/issues/11672) @[joechenrh](https://github.com/joechenrh) + +## Compatibility Changes + +- note [#issue](https://github.com/pingcap/${repo-name}/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + +## Improvements + ++ TiDB + + - note [#issue](https://github.com/pingcap/tidb/issues/${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/${github-id}) + ++ TiKV + + - note [#issue](https://github.com/tikv/tikv/issues/${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/${github-id}) + - (dup): release-8.5.4.md > Improvements > TiKV - Optimized the calculation of the default value for the gRPC thread pool size. The previous fixed value has been adjusted to a dynamic calculation based on the total CPU configuration, preventing performance bottlenecks caused by an insufficient number of gRPC threads [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) + - (dup): release-8.5.5.md > Improvements > TiKV - Limited the rate of BR log recovery requests when TiKV memory usage is high, preventing TiKV OOM [#18124](https://github.com/tikv/tikv/issues/18124) @[3pointer](https://github.com/3pointer) + ++ PD + + - note [#issue](https://github.com/tikv/pd/issues/${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/${github-id}) + - (dup): release-8.5.5.md > Improvements > PD - Optimized high-cardinality metrics, reducing PD's memory consumption and pressure on the monitoring system [#9357](https://github.com/tikv/pd/issues/9357) @[rleungx](https://github.com/rleungx) + - (dup): release-7.5.7.md > Improvements > PD - Reduced unnecessary error logs [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + ++ TiFlash + + - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[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}) @[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}) @[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}) @[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/${github-id}) + +## Bug Fixes + ++ TiDB + + - note [#issue](https://github.com/pingcap/tidb/issues/${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/${github-id}) + ++ TiKV + + - note [#issue](https://github.com/tikv/tikv/issues/${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/${github-id}) + - (dup): release-5.1.4.md > Bug Fixes > TiKV - Fixed the risk of data inconsistency in rare cases during prewrite request retries in pessimistic transactions [#11187](https://github.com/tikv/tikv/issues/11187) + ++ PD + + - note [#issue](https://github.com/tikv/pd/issues/${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/${github-id}) + - (dup): release-8.5.4.md > Bug Fixes > PD - Fixed an issue where Resource Manager incorrectly allocated tokens, causing queries to hang [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) + ++ TiFlash + + - note [#issue](https://github.com/pingcap/tiflash/issues/${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/${github-id}) + ++ Tools + + + Backup & Restore (BR) + + - note [#issue](https://github.com/pingcap/tidb/issues/${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/${github-id}) + - (dup): release-8.5.5.md > Bug Fixes > Tools > Backup & Restore (BR) - Fixed an issue where enabling log backup in a cluster with a large number of Regions led to excessive memory consumption [#18719](https://github.com/tikv/tikv/issues/18719) @[YuJuncen](https://github.com/YuJuncen) + + + TiCDC + + - note [#issue](https://github.com/pingcap/tiflow/issues/${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/${github-id}) + + + TiDB Data Migration (DM) + + - note [#issue](https://github.com/pingcap/tiflow/issues/${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/${github-id}) \ No newline at end of file From bcbf29b043ddc95238acd31f0c60492176a4bc79 Mon Sep 17 00:00:00 2001 From: houfaxin Date: Thu, 19 Mar 2026 10:13:50 +0800 Subject: [PATCH 04/10] Update release-8.5.6.md --- releases/release-8.5.6.md | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/releases/release-8.5.6.md b/releases/release-8.5.6.md index 920a16aaa26be..ec6c2c05dc7af 100644 --- a/releases/release-8.5.6.md +++ b/releases/release-8.5.6.md @@ -25,7 +25,7 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with ### Data Migration -- (dup): release-9.0.0.md > # Data Migration * Migrated sync-diff-inspector from the `pingcap/tidb-tools` repository to the `pingcap/tiflow` repository [#11672](https://github.com/pingcap/tiflow/issues/11672) @[joechenrh](https://github.com/joechenrh) +- (dup): release-9.0.0.md > # 数据迁移 * 将 sync-diff-inspector 从 `pingcap/tidb-tools` 迁移至 `pingcap/tiflow` 代码仓库 [#11672](https://github.com/pingcap/tiflow/issues/11672) @[joechenrh](https://github.com/joechenrh) ## Compatibility Changes @@ -42,15 +42,15 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with - note [#issue](https://github.com/tikv/tikv/issues/${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/${github-id}) - - (dup): release-8.5.4.md > Improvements > TiKV - Optimized the calculation of the default value for the gRPC thread pool size. The previous fixed value has been adjusted to a dynamic calculation based on the total CPU configuration, preventing performance bottlenecks caused by an insufficient number of gRPC threads [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) - - (dup): release-8.5.5.md > Improvements > TiKV - Limited the rate of BR log recovery requests when TiKV memory usage is high, preventing TiKV OOM [#18124](https://github.com/tikv/tikv/issues/18124) @[3pointer](https://github.com/3pointer) + - (dup): release-8.5.4.md > 改进提升> TiKV - 优化 gRPC 线程池线程数量默认值的计算方式，将原固定值调整为根据总的 CPU 配置动态计算，避免因 gRPC 线程数量过小导致的性能瓶颈 [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) + - (dup): release-8.5.5.md > 改进提升> TiKV - 在 TiKV 内存占用高时，对 BR 的日志恢复请求进行限流，防止 TiKV OOM [#18124](https://github.com/tikv/tikv/issues/18124) @[3pointer](https://github.com/3pointer) + PD - note [#issue](https://github.com/tikv/pd/issues/${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/${github-id}) - - (dup): release-8.5.5.md > Improvements > PD - Optimized high-cardinality metrics, reducing PD's memory consumption and pressure on the monitoring system [#9357](https://github.com/tikv/pd/issues/9357) @[rleungx](https://github.com/rleungx) - - (dup): release-7.5.7.md > Improvements > PD - Reduced unnecessary error logs [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + - (dup): release-8.5.5.md > 改进提升> PD - 优化了高基数指标，降低 PD 的内存占用和监控系统压力 [#9357](https://github.com/tikv/pd/issues/9357) @[rleungx](https://github.com/rleungx) + - (dup): release-7.5.7.md > 改进提升> PD - 减少非必要的错误日志 [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + TiFlash @@ -100,13 +100,13 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with - note [#issue](https://github.com/tikv/tikv/issues/${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/${github-id}) - - (dup): release-5.1.4.md > Bug Fixes > TiKV - Fixed the risk of data inconsistency in rare cases during prewrite request retries in pessimistic transactions [#11187](https://github.com/tikv/tikv/issues/11187) + - (dup): release-5.1.4.md > Bug 修复> TiKV - 修复悲观事务中 prewrite 请求重试在极少数情况下影响数据一致性的风险 [#11187](https://github.com/tikv/tikv/issues/11187) + PD - note [#issue](https://github.com/tikv/pd/issues/${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/${github-id}) - - (dup): release-8.5.4.md > Bug Fixes > PD - Fixed an issue where Resource Manager incorrectly allocated tokens, causing queries to hang [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) + - (dup): release-8.5.4.md > 错误修复> PD - 修复 Resource Manager 错误分配 token 导致查询卡住的问题 [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) + TiFlash @@ -119,7 +119,7 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with - note [#issue](https://github.com/pingcap/tidb/issues/${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/${github-id}) - - (dup): release-8.5.5.md > Bug Fixes > Tools > Backup & Restore (BR) - Fixed an issue where enabling log backup in a cluster with a large number of Regions led to excessive memory consumption [#18719](https://github.com/tikv/tikv/issues/18719) @[YuJuncen](https://github.com/YuJuncen) + - (dup): release-8.5.5.md > 错误修复> Tools> Backup & Restore (BR) - 修复集群中存在大量 Region 时，开启日志备份导致内存占用过高的问题 [#18719](https://github.com/tikv/tikv/issues/18719) @[YuJuncen](https://github.com/YuJuncen) + TiCDC From 6d7792388e4d49e0fb2f57040bede07b39a97204 Mon Sep 17 00:00:00 2001 From: houfaxin Date: Thu, 19 Mar 2026 10:29:02 +0800 Subject: [PATCH 05/10] Update release-8.5.6.md --- releases/release-8.5.6.md | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/releases/release-8.5.6.md b/releases/release-8.5.6.md index ec6c2c05dc7af..387ce8278fbd6 100644 --- a/releases/release-8.5.6.md +++ b/releases/release-8.5.6.md @@ -25,7 +25,7 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with ### Data Migration -- (dup): release-9.0.0.md > # 数据迁移 * 将 sync-diff-inspector 从 `pingcap/tidb-tools` 迁移至 `pingcap/tiflow` 代码仓库 [#11672](https://github.com/pingcap/tiflow/issues/11672) @[joechenrh](https://github.com/joechenrh) +- (dup): release-9.0.0.md > # Data migration * Migrate sync-diff-inspector from `pingcap/tidb-tools` to `pingcap/tiflow` repository [#11672](https://github.com/pingcap/tiflow/issues/11672) @[joechenrh](https://github.com/joechenrh) ## Compatibility Changes @@ -42,15 +42,15 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with - note [#issue](https://github.com/tikv/tikv/issues/${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/${github-id}) - - (dup): release-8.5.4.md > 改进提升> TiKV - 优化 gRPC 线程池线程数量默认值的计算方式，将原固定值调整为根据总的 CPU 配置动态计算，避免因 gRPC 线程数量过小导致的性能瓶颈 [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) - - (dup): release-8.5.5.md > 改进提升> TiKV - 在 TiKV 内存占用高时，对 BR 的日志恢复请求进行限流，防止 TiKV OOM [#18124](https://github.com/tikv/tikv/issues/18124) @[3pointer](https://github.com/3pointer) + - (dup): release-8.5.4.md > Improvements> TiKV - Optimize the calculation method of the default gRPC thread pool size by making it dynamically calculated based on total CPU quota instead of a fixed value, avoiding performance bottlenecks caused by insufficient gRPC threads [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) + - (dup): release-8.5.5.md > Improvements> TiKV - Throttle BR log restore requests when TiKV memory usage is high to prevent TiKV OOM [#18124](https://github.com/tikv/tikv/issues/18124) @[3pointer](https://github.com/3pointer) + PD - note [#issue](https://github.com/tikv/pd/issues/${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/${github-id}) - - (dup): release-8.5.5.md > 改进提升> PD - 优化了高基数指标，降低 PD 的内存占用和监控系统压力 [#9357](https://github.com/tikv/pd/issues/9357) @[rleungx](https://github.com/rleungx) - - (dup): release-7.5.7.md > 改进提升> PD - 减少非必要的错误日志 [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + - (dup): release-8.5.5.md > Improvements> PD - Optimize metrics with high cardinality to reduce PD memory usage and relieve pressure on the monitoring system [#9357](https://github.com/tikv/pd/issues/9357) @[rleungx](https://github.com/rleungx) + - (dup): release-7.5.7.md > Improvements> PD - Reduce unnecessary error logs [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + TiFlash @@ -100,13 +100,13 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with - note [#issue](https://github.com/tikv/tikv/issues/${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/${github-id}) - - (dup): release-5.1.4.md > Bug 修复> TiKV - 修复悲观事务中 prewrite 请求重试在极少数情况下影响数据一致性的风险 [#11187](https://github.com/tikv/tikv/issues/11187) + - (dup): release-5.1.4.md > Bug fixes> TiKV - Fix the rare data inconsistency issue when retrying a prewrite request in pessimistic transactions [#11187](https://github.com/tikv/tikv/issues/11187) + PD - note [#issue](https://github.com/tikv/pd/issues/${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/${github-id}) - - (dup): release-8.5.4.md > 错误修复> PD - 修复 Resource Manager 错误分配 token 导致查询卡住的问题 [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) + - (dup): release-8.5.4.md > Bug fixes> PD - Fix the issue that the Resource Manager incorrectly allocates tokens, causing queries to be stuck [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) + TiFlash @@ -119,7 +119,7 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with - note [#issue](https://github.com/pingcap/tidb/issues/${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/${github-id}) - - (dup): release-8.5.5.md > 错误修复> Tools> Backup & Restore (BR) - 修复集群中存在大量 Region 时，开启日志备份导致内存占用过高的问题 [#18719](https://github.com/tikv/tikv/issues/18719) @[YuJuncen](https://github.com/YuJuncen) + - (dup): release-8.5.5.md > Bug fixes> Tools> Backup & Restore (BR) - Fix the issue that enabling log backup causes excessive memory usage when the cluster contains many Regions [#18719](https://github.com/tikv/tikv/issues/18719) @[YuJuncen](https://github.com/YuJuncen) + TiCDC From b042351d3cf771d3e8c8374553c0a4ef6f585673 Mon Sep 17 00:00:00 2001 From: houfaxin Date: Thu, 19 Mar 2026 10:56:34 +0800 Subject: [PATCH 06/10] Update release-8.5.6.md --- releases/release-8.5.6.md | 5 ----- 1 file changed, 5 deletions(-) diff --git a/releases/release-8.5.6.md b/releases/release-8.5.6.md index 387ce8278fbd6..154cda5ad65f9 100644 --- a/releases/release-8.5.6.md +++ b/releases/release-8.5.6.md @@ -42,14 +42,11 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with - note [#issue](https://github.com/tikv/tikv/issues/${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/${github-id}) - - (dup): release-8.5.4.md > Improvements> TiKV - Optimize the calculation method of the default gRPC thread pool size by making it dynamically calculated based on total CPU quota instead of a fixed value, avoiding performance bottlenecks caused by insufficient gRPC threads [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) - - (dup): release-8.5.5.md > Improvements> TiKV - Throttle BR log restore requests when TiKV memory usage is high to prevent TiKV OOM [#18124](https://github.com/tikv/tikv/issues/18124) @[3pointer](https://github.com/3pointer) + PD - note [#issue](https://github.com/tikv/pd/issues/${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/${github-id}) - - (dup): release-8.5.5.md > Improvements> PD - Optimize metrics with high cardinality to reduce PD memory usage and relieve pressure on the monitoring system [#9357](https://github.com/tikv/pd/issues/9357) @[rleungx](https://github.com/rleungx) - (dup): release-7.5.7.md > Improvements> PD - Reduce unnecessary error logs [#9370](https://github.com/tikv/pd/issues/9370) @[bufferflies](https://github.com/bufferflies) + TiFlash @@ -106,7 +103,6 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with - note [#issue](https://github.com/tikv/pd/issues/${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/${github-id}) - - (dup): release-8.5.4.md > Bug fixes> PD - Fix the issue that the Resource Manager incorrectly allocates tokens, causing queries to be stuck [#9455](https://github.com/tikv/pd/issues/9455) @[JmPotato](https://github.com/JmPotato) + TiFlash @@ -119,7 +115,6 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with - note [#issue](https://github.com/pingcap/tidb/issues/${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-8.5.5.md > Bug fixes> Tools> Backup & Restore (BR) - Fix the issue that enabling log backup causes excessive memory usage when the cluster contains many Regions [#18719](https://github.com/tikv/tikv/issues/18719) @[YuJuncen](https://github.com/YuJuncen) + TiCDC From 4a973fc8cd581354614f9304acd78414caa26226 Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Thu, 19 Mar 2026 11:31:59 +0800 Subject: [PATCH 07/10] Update releases/release-8.5.6.md --- releases/release-8.5.6.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.6.md b/releases/release-8.5.6.md index 154cda5ad65f9..70aa62dd0ba6c 100644 --- a/releases/release-8.5.6.md +++ b/releases/release-8.5.6.md @@ -15,7 +15,7 @@ Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with ### Stability -- The ability to set resource limits for background tasks in Resource Control is now Generally Available (GA) [#56019](https://github.com/pingcap/tidb/issues/56019) @[glorv](https://github.com/glorv) +- The ability to set resource limits for background tasks in Resource Control is now Generally Available (GA) [#56019](https://github.com/pingcap/tidb/issues/56019) @[glorv](https://github.com/glorv) **tw@hfxsd** TiDB Resource Control can identify and lower the priority of background tasks. In some scenarios, even with idle resources, users may want to keep the consumption of background tasks at a very low level. Starting from v8.4.0, you can use the `UTILIZATION_LIMIT` parameter to set the maximum percentage of resources that background tasks under Resource Control can use, controlling the usage of all background tasks on each node below this percentage. This feature allows you to finely control the resource consumption of background tasks, further enhancing cluster stability. From 068e5ebe1f6b870fb25d207de3564f5a88730744 Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Thu, 19 Mar 2026 15:07:35 +0800 Subject: [PATCH 08/10] Update releases/release-8.5.6.md --- releases/release-8.5.6.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/releases/release-8.5.6.md b/releases/release-8.5.6.md index 70aa62dd0ba6c..add527a6a0f66 100644 --- a/releases/release-8.5.6.md +++ b/releases/release-8.5.6.md @@ -9,7 +9,7 @@ Release Date: 2026-xx-xx TiDB Version: 8.5.6 -Try it out: [Quick Start](https://docs.pingcap.com/zh/tidb/v8.5/quick-start-with-tidb) | [Production Deployment](https://docs.pingcap.com/zh/tidb/v8.5/production-deployment-using-tiup) | [Download Offline Package](https://pingkai.cn/download#tidb-community) +Try it out: [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) | [Download Offline Package](https://pingkai.cn/download#tidb-community) ## Feature Details From 02224aafa0ee534963c0761203f1e090c99d4b81 Mon Sep 17 00:00:00 2001 From: dongmen <20351731+asddongmen@users.noreply.github.com> Date: Wed, 25 Mar 2026 16:42:33 +0800 Subject: [PATCH 09/10] Update release notes for TiCDC fixes and enhancements --- releases/release-8.5.6.md | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/releases/release-8.5.6.md b/releases/release-8.5.6.md index add527a6a0f66..a728680aaeab5 100644 --- a/releases/release-8.5.6.md +++ b/releases/release-8.5.6.md @@ -118,8 +118,10 @@ Try it out: [Quick Start](https://docs.pingcap.com/tidb/v8.5/quick-start-with-ti + 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/${github-id}) + - Fixed an issue where changefeed might repeatedly create invalid dispatchers when the server restarts. [#4452](https://github.com/pingcap/ticdc/issues/4452) @[wlwilliamx](https://github.com/wlwilliamx) + - Fixed an issue where table renaming operations could not be performed normally when the upstream TiDB version was <= v8.1.x. [#4392](https://github.com/pingcap/ticdc/issues/4392) @[lidezhu](https://github.com/lidezhu) + - Fixed a bug during data scanning to avoid potential abnormal crashes of TiKV when CDC is enabled. [#19404](https://github.com/tikv/tikv/issues/19404) @[wk989898](https://github.com/wk989898) + - Supported Azure Managed Identity authentication for azblob sinks and fixed a potential stuck issue during cloud storage uploads. [#3093](https://github.com/pingcap/ticdc/issues/3093) @[wlwilliamx](https://github.com/wlwilliamx) + TiDB Data Migration (DM) @@ -139,4 +141,4 @@ Try it out: [Quick Start](https://docs.pingcap.com/tidb/v8.5/quick-start-with-ti + TiUP - note [#issue](https://github.com/pingcap/tiup/issues/${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/${github-id}) \ No newline at end of file + - note [#issue](https://github.com/pingcap/tiup/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) From cd9a122a8fdacf213c381163250ee8775d2e0db7 Mon Sep 17 00:00:00 2001 From: xixirangrang Date: Wed, 25 Mar 2026 18:48:25 +0800 Subject: [PATCH 10/10] Apply suggestions from code review Co-authored-by: HuaiyuXu Co-authored-by: Bisheng Huang --- releases/release-8.5.6.md | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/releases/release-8.5.6.md b/releases/release-8.5.6.md index a728680aaeab5..d55b3c9d4f4f5 100644 --- a/releases/release-8.5.6.md +++ b/releases/release-8.5.6.md @@ -35,13 +35,16 @@ Try it out: [Quick Start](https://docs.pingcap.com/tidb/v8.5/quick-start-with-ti + TiDB - - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + - Enhanced slow query log control by supporting [`tidb_slow_log_rules`](/system-variables.md#tidb_slow_log_rules-new-in-v900) for targeted slow query log output based on combinations of multiple metrics, [`tidb_slow_log_max_per_sec`](/system-variables.md#tidb_slow_log_max_per_sec-new-in-v900) for limiting the number of slow query log entries per second, and the [`WRITE_SLOW_LOG`](/identify-slow-queries.md#related-hint) hint for forcing specified SQL statements to be recorded in the slow query log [#64010](https://github.com/pingcap/tidb/issues/64010) @[zimulala](https://github.com/zimulala) + - Enhanced [Top SQL](/dashboard/top-sql.md) for resource analysis by supporting Top `5`, `20`, or `100` queries, hotspot analysis sorted by CPU, network traffic, or logical I/O, and aggregated analysis by `Query`, `Table`, `DB`, or `Region` on TiKV instances [#62916](https://github.com/pingcap/tidb/issues/62916) @[yibin87](https://github.com/yibin87) - note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[Contributor GitHub ID](https://github.com/${github-id}) + TiKV - - note [#issue](https://github.com/tikv/tikv/issues/${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/${github-id}) + - Add MVCC-read-aware load-based compaction to prioritize regions with heavy MVCC read overhead. [#19133](https://github.com/tikv/tikv/issues/19133) @[mittalrishabh](https://github.com/mittalrishabh) + - Optimize stale-range cleanup during scaling by deleting stale keys directly instead of ingesting SST files, reducing latency impact. [#18042](https://github.com/tikv/tikv/issues/18042) @[LykxSassinator](https://github.com/LykxSassinator) + - Make default gRPC raft connection and concurrency settings scale with CPU quota to improve resource utilization. [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator) + - Add Top SQL support for collecting network traffic and logical I/O information to help diagnose SQL performance issues. [#18815](https://github.com/tikv/tikv/issues/18815) @[yibin87](https://github.com/yibin87) + PD @@ -95,8 +98,12 @@ Try it out: [Quick Start](https://docs.pingcap.com/tidb/v8.5/quick-start-with-ti + TiKV - - note [#issue](https://github.com/tikv/tikv/issues/${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}) + - Fix the issue that global indexes on non-unique columns of partitioned tables might become inconsistent and return incorrect results in some cases. [#19262](https://github.com/tikv/tikv/issues/19262) @[mjonss](https://github.com/mjonss) + - Fix the issue that stalled coprocessor snapshot retrieval could occupy unified read pool workers until request deadlines expired, delaying other read requests. [#18491](https://github.com/tikv/tikv/issues/18491) @[AndreMouche](https://github.com/AndreMouche) + - Fix the issue that follower replica reads could remain blocked on disk-full TiKV nodes by rejecting read-index requests on disk-full followers. [#19201](https://github.com/tikv/tikv/issues/19201) @[glorv](https://github.com/glorv) + - Fix the issue that resolved-ts task backlogs could cause OOM when the resolved-ts worker is busy. [#18359](https://github.com/tikv/tikv/issues/18359) @[overvenus](https://github.com/overvenus) + - Fix long-tail follower-read latency during leader transfer by retrying read-index requests sooner and adding a dedicated retry interval setting. [#18417](https://github.com/tikv/tikv/issues/18417) @[gengliqi](https://github.com/gengliqi) + - Fix ingest latency spikes in large clusters by increasing the default `rocksdb.max-manifest-file-size` from 128 MiB to 256 MiB. [#18996](https://github.com/tikv/tikv/issues/18996) @[glorv](https://github.com/glorv) - (dup): release-5.1.4.md > Bug fixes> TiKV - Fix the rare data inconsistency issue when retrying a prewrite request in pessimistic transactions [#11187](https://github.com/tikv/tikv/issues/11187) + PD