[WIP]: add v8.5.5 release notes #21195

qiancai · 2025-12-16T08:12:29Z

What is changed, added or deleted? (Required)

As in the title, this PR adds the release note doc for v8.5.5.

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This PR is translated from: [WIP]: add v8.5.5 release notes docs#22190
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ti-chi-bot · 2025-12-17T06:13:02Z

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releases/release-8.5.5.md

Co-authored-by: zhaoshangzi <zhaoshangzi@icloud.com> Co-authored-by: Frank945946 <108602632+Frank945946@users.noreply.github.com>

joechenrh

LGTM, for the ADD INDEX part.

ti-chi-bot · 2025-12-23T09:47:11Z

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qiancai · 2025-12-24T06:47:59Z

releases/release-8.5.5.md

+
+    更多信息，请参考[用户文档](链接)。
+
+* 按时间点恢复 (Point-in-time recovery, PITR) 支持从压缩后的日志备份中恢复，以加快恢复速度 [#56522](https://github.com/pingcap/tidb/issues/56522) @[YuJuncen](https://github.com/YuJuncen) **tw@lilin90** <!--2001-->


这条的中文目前是从 v9.0.0 复制过来的之前的描述，麻烦请按照 https://github.com/pingcap/docs/pull/22190/files 里最新的英文进行调整 @lilin90

qiancai · 2025-12-24T06:48:14Z

releases/release-8.5.5.md

+
+    更多信息，请参考[用户文档](https://docs.pingcap.com/zh/tidb/v8.5/tikv-configuration-file#graceful-shutdown-timeout-从-v855-版本开始引入)。
+
+* 提升进行中的日志备份与快照恢复的兼容性 [#58685](https://github.com/pingcap/tidb/issues/58685) @[BornChanger](https://github.com/BornChanger) **tw@lilin90** <!--2000-->


这条的中文目前是从 v9.0.0 复制过来的之前的描述，麻烦请按照 https://github.com/pingcap/docs/pull/22190/files 里最新的英文进行调整 @lilin90

Co-authored-by: zhaoshangzi <zhaoshangzi@icloud.com>

releases/release-8.5.5.md

lcwangchao · 2025-12-25T02:43:24Z

releases/release-8.5.5.md

+
+* 提示索引下推到TiKV提升查询性能 [#62575](https://github.com/pingcap/tidb/issues/62575) @[lcwangchao](https://github.com/lcwangchao) **tw@qiancai** <!--1899-->
+
+    通过hint INDEX_LOOKUP_PUSHDOWN(t1_name, idx1_name [, idx2_name ...]) 提示优化器将指定索引查询下推到TiKV，减少远程调用的次数，经过测试数据对比显示性能可提升约20%左右，最优可提升到40%。本特性一般建议结合表 affinity 属性使用，即表属性 AFFINITY="table" 或者 分区表属性 AFFINITY="partition" 。


实际数据可能根据环境和负载不同有很大区别，这个数据目前是混合负载的结果，不光包含 pushdown

@zhaoshangzi PTAL

通过hint INDEX_LOOKUP_PUSHDOWN(t1_name, idx1_name [, idx2_name ...]) 提示优化器将指定索引查询下推到TiKV，减少远程调用的次数，性能在理论上有提升，但具体提升比例需要结合业务场景实际测试。本特性一般建议结合表 affinity 属性使用，即表属性 AFFINITY="table" 或者分区表属性 AFFINITY="partition" 。

releases/release-8.5.5.md

Co-authored-by: Frank945946 <108602632+Frank945946@users.noreply.github.com> Co-authored-by: JaySon <tshent@qq.com> Co-authored-by: hongyunyan <649330952@qq.com>

releases/release-8.5.5.md

Co-authored-by: Ryan Leung <rleungx@gmail.com>

releases/release-8.5.5.md

ti-chi-bot · 2025-12-31T03:32:50Z

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pull-verify	`4e6ac0a`	link	true	`/test pull-verify`

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gengliqi · 2025-12-31T15:40:06Z

releases/release-8.5.5.md

+    - 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 > 错误修复> TiDB - 修复查询 `information_schema.tables` 可能出现 OOM 问题，优化系统表查询过程中的内存使用监控 [#58985](https://github.com/pingcap/tidb/issues/58985) @[tangenta](https://github.com/tangenta)
+


Suggested change

- 修复手动 kill 正在执行事务的 connection 可能导致 tidb 发生 panic 异常退出的问题 [#63956](https://github.com/pingcap/tidb/issues/63956) @[wshwsh12](https://github.com/wshwsh12)

- 修复缓存表在走 TiFlash 副本读取时可能出现的 goroutine 和内存泄漏问题 [#63329](https://github.com/pingcap/tidb/issues/63329) @[xzhangxian1008](https://github.com/xzhangxian1008)

gengliqi · 2025-12-31T15:40:51Z

releases/release-8.5.5.md

+
+    - 修复在 BR restore 的过程中，TiFlash 可能 panic 的问题 [#10606](https://github.com/pingcap/tiflash/issues/10606) @[CalvinNeo](https://github.com/CalvinNeo)
+    - 修复在 BR restore 的过程中，TiFlash 不能充分利用超过 16 核 CPU 进行数据恢复的问题 [#10605](https://github.com/pingcap/tiflash/issues/10605) @[JaySon-Huang](https://github.com/JaySon-Huang)
+    - note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})


Suggested change

- note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})

- 修复 GROUP_CONCAT 触发落盘时可能导致 TiFlash 异常退出的问题 [#10553](https://github.com/pingcap/tiflash/issues/10553) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan)

- note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})

gengliqi · 2025-12-31T15:47:10Z

releases/release-8.5.5.md

+    - 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 > 改进提升> TiDB - 优化分布式执行框架 (Distributed eXecution Framework, DXF) 内部 SQL 语句的 CPU 使用率 [#59344](https://github.com/pingcap/tidb/issues/59344) @[D3Hunter](https://github.com/D3Hunter)
+


Suggested change

- 优化 IndexHashJoin 的执行方式，在部分 JOIN 场景下采用增量处理以避免一次性加载大量数据，显著降低内存占用并提升执行性能 [#63303](https://github.com/pingcap/tidb/issues/63303) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan)

Add temp.md

813850f

qiancai added do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. needs-cherry-pick-release-8.5 Should cherry pick this PR to release-8.5 branch. translation/from-docs This PR is translated from a PR in pingcap/docs. labels Dec 16, 2025

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Create release-8.5.5.md

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qiancai self-assigned this Dec 16, 2025

add feature description for #56522 and #58685

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add pingcap#17221

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Add three features

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Co-authored-by: zhaoshangzi <zhaoshangzi@icloud.com> Co-authored-by: Frank945946 <108602632+Frank945946@users.noreply.github.com>

joechenrh approved these changes Dec 23, 2025

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add more features according to English PR

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qiancai commented Dec 24, 2025

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add improvements and bug fixes

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qiancai and others added 2 commits December 25, 2025 09:55

add two new features

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Co-authored-by: zhaoshangzi <zhaoshangzi@icloud.com>

adjust the feature order and add two features

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add the issue information for a feature

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Add br config "--checkpoint-storage"

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update optimizer hint NO_INDEX_LOOKUP_PUSHDOWN

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Co-authored-by: Frank945946 <108602632+Frank945946@users.noreply.github.com> Co-authored-by: JaySon <tshent@qq.com> Co-authored-by: hongyunyan <649330952@qq.com>

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add the feature description for storage engine identifiers

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move ticdc pingcap#12253 from bug fixes to improvements

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add PD improvements and bug fixes

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Compatibility changes: add tidb_index_lookup_pushdown_policy

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		更多信息，请参考[用户文档](链接)。

		* 按时间点恢复 (Point-in-time recovery, PITR) 支持从压缩后的日志备份中恢复，以加快恢复速度 [#56522](https://github.com/pingcap/tidb/issues/56522) @[YuJuncen](https://github.com/YuJuncen) tw@lilin90 <!--2001-->


		更多信息，请参考[用户文档](https://docs.pingcap.com/zh/tidb/v8.5/tikv-configuration-file#graceful-shutdown-timeout-从-v855-版本开始引入)。

		* 提升进行中的日志备份与快照恢复的兼容性 [#58685](https://github.com/pingcap/tidb/issues/58685) @[BornChanger](https://github.com/BornChanger) tw@lilin90 <!--2000-->


		* 提示索引下推到TiKV提升查询性能 [#62575](https://github.com/pingcap/tidb/issues/62575) @[lcwangchao](https://github.com/lcwangchao) tw@qiancai <!--1899-->

		通过hint INDEX_LOOKUP_PUSHDOWN(t1_name, idx1_name [, idx2_name ...]) 提示优化器将指定索引查询下推到TiKV，减少远程调用的次数，经过测试数据对比显示性能可提升约20%左右，最优可提升到40%。本特性一般建议结合表 affinity 属性使用，即表属性 AFFINITY="table" 或者分区表属性 AFFINITY="partition" 。


	- 修复手动 kill 正在执行事务的 connection 可能导致 tidb 发生 panic 异常退出的问题 [#63956](https://github.com/pingcap/tidb/issues/63956) @[wshwsh12](https://github.com/wshwsh12)
	- 修复缓存表在走 TiFlash 副本读取时可能出现的 goroutine 和内存泄漏问题 [#63329](https://github.com/pingcap/tidb/issues/63329) @[xzhangxian1008](https://github.com/xzhangxian1008)

	- note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
	- 修复 GROUP_CONCAT 触发落盘时可能导致 TiFlash 异常退出的问题 [#10553](https://github.com/pingcap/tiflash/issues/10553) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan)
	- note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})


	- 优化 IndexHashJoin 的执行方式，在部分 JOIN 场景下采用增量处理以避免一次性加载大量数据，显著降低内存占用并提升执行性能 [#63303](https://github.com/pingcap/tidb/issues/63303) @[ChangRui-Ryan](https://github.com/ChangRui-Ryan)

[WIP]: add v8.5.5 release notes #21195

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[WIP]: add v8.5.5 release notes #21195

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qiancai commented Dec 16, 2025

What is changed, added or deleted? (Required)

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What is the related PR or file link(s)?

Do your changes match any of the following descriptions?

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