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

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 <[email protected]> Co-authored-by: Frank945946 <[email protected]>

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 <[email protected]>

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

okJiang · 2026-01-05T05:40:29Z

releases/release-8.5.5.md

+* 提升 TiKV 在网络抖动时的调度稳定性 [#9359](https://github.com/tikv/pd/issues/9359) @[okJiang](https://github.com/okJiang) **tw@qiancai** <!--2260-->
+
+    从 v8.5.5 起，TiKV 引入网络慢节点检测与反馈机制。启用该机制后，TiKV 会在节点之间探测网络延时，计算网络慢节点分数，并将该分数上报给 PD。PD 基于该分数判断 TiKV 节点的网络状态并进行相应的调度调整：当检测到某个 TiKV 节点存在网络抖动时，PD 会限制向该节点调度新的 Leader；如果网络抖动持续存在，PD 会主动将该节点上的现有 Leader 驱逐到其他 TiKV 节点，从而降低网络异常对集群的影响。


releases/release-8.5.5.md

hujiatao0 · 2026-01-05T06:14:36Z

releases/release-8.5.5.md

+
+* TiKV 支持优雅关闭 (graceful shutdown) [#17221](https://github.com/tikv/tikv/issues/17221) @[hujiatao0](https://github.com/hujiatao0) **tw@qiancai** <!--2297-->
+
+    在关闭 TiKV 服务器时，TiKV 会在配置的等待期内尽量先将节点上的 leader 副本转移到其他 TiKV 节点，然后再关闭。该等待期默认为 20 秒，可通过 [`server.graceful-shutdown-timeout`](https://docs.pingcap.com/zh/tidb/v8.5/tikv-configuration-file#graceful-shutdown-timeout-从-v855-版本开始引入) 配置项进行调整。若达到该超时时间后仍有 leader 未完成转移，TiKV 将跳过剩余 leader 的转移，直接进入关闭流程。


ti-chi-bot · 2026-01-05T06:15:45Z

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releases/release-8.5.5.md

Co-authored-by: you06 <[email protected]>

ti-chi-bot · 2026-01-05T08:05:00Z

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hfxsd · 2026-01-06T03:10:45Z

releases/release-8.5.5.md

+    - fix the problem that foreign key is not updated after modify column [#issue](https://github.com/pingcap/tidb/issues/59705) @[fzzf678](https://github.com/fzzf678) <!--tw@hfxsd: the following 16 notes-->
+    - fix error decoding `RENAME TABLE` job arg from older version TiDB [#issue](https://github.com/pingcap/tidb/issues/64413) @[joechenrh](https://github.com/joechenrh)
+    - fix missing rebase auto increment not executed if BR restore failed [#issue](https://github.com/pingcap/tidb/issues/64761) @[joechenrh](https://github.com/joechenrh)
+    - fix OOM issue when querying `information_schema` tables [#issue](https://github.com/pingcap/tidb/issues/58985) @[tangenta](https://github.com/tangenta)
+    - fix the problem that TiDB node may stuck during upgrade [#issue](https://github.com/pingcap/tidb/issues/64539) @[joechenrh](https://github.com/joechenrh)
+    - fix unexpected successful admin check when there are no index record [#issue](https://github.com/pingcap/tidb/issues/63698) @[wjhuang2016](https://github.com/wjhuang2016)
+    - fix data-index inconsistency when chaning collation with modify column [#issue](https://github.com/pingcap/tidb/issues/61668) @[tangenta](https://github.com/tangenta)
+    - fix incorrect initialization for foreign key related fields when copying table info [#issue](https://github.com/pingcap/tidb/issues/61668) @[tangenta](https://github.com/tangenta)
+    - fix the problem that embedded analyze may be not triggered for multi schema change [#issue](https://github.com/pingcap/tidb/issues/65040) @[joechenrh](https://github.com/joechenrh)
+    - fix the problem that the DXF task was not cancelled after canceling the add index job [#issue](https://github.com/pingcap/tidb/issues/64129) @[tangenta](https://github.com/tangenta)
+    - fix incorrect check to determing whether to load table info for tables contain foreign key [#issue](https://github.com/pingcap/tidb/issues/60444) @[JQWong7](https://github.com/JQWong7)
+    - fix incorrect auto ID setting after cross-database rename table [#issue](https://github.com/pingcap/tidb/issues/64561) @[joechenrh](https://github.com/joechenrh)
+    - fix incorrect handling meta key for older version of TiDB [#issue](https://github.com/pingcap/tidb/issues/64323) @[wjhuang2016](https://github.com/wjhuang2016)
+    - fix ligtning doesnt' report error for schema files without trailing semicolon [#issue](https://github.com/pingcap/tidb/issues/63414) @[GMHDBJD](https://github.com/GMHDBJD)
+    - fix the dead loop when reading files during IMPORT INTO global sort [#issue](https://github.com/pingcap/tidb/issues/61177) @[CbcWestwolf](https://github.com/CbcWestwolf)
+    - fix the panic when processing generated columns for IMPORT INTO [#issue](https://github.com/pingcap/tidb/issues/64657) @[D3Hunter](https://github.com/D3Hunter)
+    - 修复在一个语句中有多个 `AS OF TIMESTAMP` 表达式时可能误报错的问题 [#issue](https://github.com/pingcap/tidb/issues/65090) @[you06](https://github.com/you06)


Suggested change

- fix the problem that foreign key is not updated after modify column [#issue](https://github.com/pingcap/tidb/issues/59705) @[fzzf678](https://github.com/fzzf678) 

- fix error decoding `RENAME TABLE` job arg from older version TiDB [#issue](https://github.com/pingcap/tidb/issues/64413) @[joechenrh](https://github.com/joechenrh)

- fix missing rebase auto increment not executed if BR restore failed [#issue](https://github.com/pingcap/tidb/issues/64761) @[joechenrh](https://github.com/joechenrh)

- fix OOM issue when querying `information_schema` tables [#issue](https://github.com/pingcap/tidb/issues/58985) @[tangenta](https://github.com/tangenta)

- fix the problem that TiDB node may stuck during upgrade [#issue](https://github.com/pingcap/tidb/issues/64539) @[joechenrh](https://github.com/joechenrh)

- fix unexpected successful admin check when there are no index record [#issue](https://github.com/pingcap/tidb/issues/63698) @[wjhuang2016](https://github.com/wjhuang2016)

- fix data-index inconsistency when chaning collation with modify column [#issue](https://github.com/pingcap/tidb/issues/61668) @[tangenta](https://github.com/tangenta)

- fix incorrect initialization for foreign key related fields when copying table info [#issue](https://github.com/pingcap/tidb/issues/61668) @[tangenta](https://github.com/tangenta)

- fix the problem that embedded analyze may be not triggered for multi schema change [#issue](https://github.com/pingcap/tidb/issues/65040) @[joechenrh](https://github.com/joechenrh)

- fix the problem that the DXF task was not cancelled after canceling the add index job [#issue](https://github.com/pingcap/tidb/issues/64129) @[tangenta](https://github.com/tangenta)

- fix incorrect check to determing whether to load table info for tables contain foreign key [#issue](https://github.com/pingcap/tidb/issues/60444) @[JQWong7](https://github.com/JQWong7)

- fix incorrect auto ID setting after cross-database rename table [#issue](https://github.com/pingcap/tidb/issues/64561) @[joechenrh](https://github.com/joechenrh)

- fix incorrect handling meta key for older version of TiDB [#issue](https://github.com/pingcap/tidb/issues/64323) @[wjhuang2016](https://github.com/wjhuang2016)

- fix ligtning doesnt' report error for schema files without trailing semicolon [#issue](https://github.com/pingcap/tidb/issues/63414) @[GMHDBJD](https://github.com/GMHDBJD)

- fix the dead loop when reading files during IMPORT INTO global sort [#issue](https://github.com/pingcap/tidb/issues/61177) @[CbcWestwolf](https://github.com/CbcWestwolf)

- fix the panic when processing generated columns for IMPORT INTO [#issue](https://github.com/pingcap/tidb/issues/64657) @[D3Hunter](https://github.com/D3Hunter)

- 修复在一个语句中有多个 `AS OF TIMESTAMP` 表达式时可能误报错的问题 [#issue](https://github.com/pingcap/tidb/issues/65090) @[you06](https://github.com/you06)

- 修复执行 `ALTER TABLE child CHANGE COLUMN` 修改列后，外键 (Foreign Key) 没有更新的问题 [#59705](https://github.com/pingcap/tidb/issues/59705) @[fzzf678](https://github.com/fzzf678) 

- 修复解码旧版本 TiDB 的 `RENAME TABLE` 任务 arg 时出现错误的问题 [#64413](https://github.com/pingcap/tidb/issues/64413) @[joechenrh](https://github.com/joechenrh)

- fix missing rebase auto increment not executed if BR restore failed [#64761](https://github.com/pingcap/tidb/issues/64761) @[joechenrh](https://github.com/joechenrh)

- 修复查询 `information_schema` 表出现 OOM 的问题 [#58985](https://github.com/pingcap/tidb/issues/58985) @[tangenta](https://github.com/tangenta)

- 修复在升级时 TiDB 节点可能会卡住的问题 [#64539](https://github.com/pingcap/tidb/issues/64539) @[joechenrh](https://github.com/joechenrh)

- 修复当没有索引数据时，admin check 没有报错的问题 [#issue](https://github.com/pingcap/tidb/issues/63698) @[wjhuang2016](https://github.com/wjhuang2016)

- 修复执行 `MODIFY COLUMN` 修改排序规则时，数据索引不一致的问题 [#61668](https://github.com/pingcap/tidb/issues/61668) @[tangenta](https://github.com/tangenta)

- fix incorrect initialization for foreign key related fields when copying table info [#61668](https://github.com/pingcap/tidb/issues/61668) @[tangenta](https://github.com/tangenta)

- fix the problem that embedded analyze may be not triggered for multi schema change [#issue](https://github.com/pingcap/tidb/issues/65040) @[joechenrh](https://github.com/joechenrh)

- fix the problem that the DXF task was not cancelled after canceling the add index job [#issue](https://github.com/pingcap/tidb/issues/64129) @[tangenta](https://github.com/tangenta)

- fix incorrect check to determing whether to load table info for tables contain foreign key [#issue](https://github.com/pingcap/tidb/issues/60444) @[JQWong7](https://github.com/JQWong7)

- fix incorrect auto ID setting after cross-database rename table [#issue](https://github.com/pingcap/tidb/issues/64561) @[joechenrh](https://github.com/joechenrh)

- fix incorrect handling meta key for older version of TiDB [#issue](https://github.com/pingcap/tidb/issues/64323) @[wjhuang2016](https://github.com/wjhuang2016)

- fix ligtning doesnt' report error for schema files without trailing semicolon [#issue](https://github.com/pingcap/tidb/issues/63414) @[GMHDBJD](https://github.com/GMHDBJD)

- fix the dead loop when reading files during IMPORT INTO global sort [#issue](https://github.com/pingcap/tidb/issues/61177) @[CbcWestwolf](https://github.com/CbcWestwolf)

- fix the panic when processing generated columns for IMPORT INTO [#issue](https://github.com/pingcap/tidb/issues/64657) @[D3Hunter](https://github.com/D3Hunter)

- 修复在一个语句中有多个 `AS OF TIMESTAMP` 表达式时可能误报错的问题 [#issue](https://github.com/pingcap/tidb/issues/65090) @[you06](https://github.com/you06)

releases/release-8.5.5.md

qiancai · 2026-01-07T08:03:56Z

releases/release-8.5.5.md

+| -------- | -------- | -------- | -------- |
+| PD | [`schedule.max-affinity-merge-region-size`](https://docs.pingcap.com/zh/tidb/v8.5/pd-configuration-file#max-affinity-merge-region-size-从-v855-版本开始引入) | 新增 | 控制属于同一[亲和性](https://docs.pingcap.com/zh/tidb/v8.5/table-affinity)分组中相邻的小 Region 自动合并的阈值，默认值为 `256`，单位为 MiB。 |
+| PD  | [`schedule.affinity-schedule-limit`](https://docs.pingcap.com/zh/tidb/v8.5/pd-configuration-file#affinity-schedule-limit-从-v855-版本开始引入) | 新增 | 控制同时进行的[亲和性](https://docs.pingcap.com/zh/tidb/v8.5/table-affinity)调度任务数量，默认值为 `0`，表示亲和性调度默认关闭。 |
+| TiKV | [`performance.enable-async-batch-get`](https://docs.pingcap.com/zh/tidb/v8.5/tikv-configuration-file#enable-async-batch-get-从-v855-版本开始引入)  | 新增 | 控制 TiDB 是否使用异步方式执行 Batch Get 算子，默认值为 `true`。 |


Suggested change

| TiKV | [`performance.enable-async-batch-get`](https://docs.pingcap.com/zh/tidb/v8.5/tikv-configuration-file#enable-async-batch-get-从-v855-版本开始引入) | 新增 | 控制 TiDB 是否使用异步方式执行 Batch Get 算子，默认值为 `true`。 |

| TiDB | [`performance.enable-async-batch-get`](https://docs.pingcap.com/zh/tidb/v8.5/tidb-configuration-file#enable-async-batch-get-从-v855-版本开始引入) | 新增 | 控制 TiDB 是否使用异步方式执行 Batch Get 算子，默认值为 `true`。 |

releases/release-8.5.5.md

ti-chi-bot · 2026-01-07T08:57:44Z

@qiancai: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	`94554ed`	link	true	`/test pull-verify`

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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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add more features according to English PR

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add improvements and bug fixes

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add two new features

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adjust the feature order and add two features

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add the issue information for a feature

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minor wording updates

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Update releases/release-8.5.5.md

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copy release note for some modules from the English PR

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add a bug fix for TiDB

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Add three BR config items and two behavior changes

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update PD, TiKV, BR

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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" 。

		* 提升 TiKV 在网络抖动时的调度稳定性 [#9359](https://github.com/tikv/pd/issues/9359) @[okJiang](https://github.com/okJiang) tw@qiancai <!--2260-->

		从 v8.5.5 起，TiKV 引入网络慢节点检测与反馈机制。启用该机制后，TiKV 会在节点之间探测网络延时，计算网络慢节点分数，并将该分数上报给 PD。PD 基于该分数判断 TiKV 节点的网络状态并进行相应的调度调整：当检测到某个 TiKV 节点存在网络抖动时，PD 会限制向该节点调度新的 Leader；如果网络抖动持续存在，PD 会主动将该节点上的现有 Leader 驱逐到其他 TiKV 节点，从而降低网络异常对集群的影响。


		* TiKV 支持优雅关闭 (graceful shutdown) [#17221](https://github.com/tikv/tikv/issues/17221) @[hujiatao0](https://github.com/hujiatao0) tw@qiancai <!--2297-->

		在关闭 TiKV 服务器时，TiKV 会在配置的等待期内尽量先将节点上的 leader 副本转移到其他 TiKV 节点，然后再关闭。该等待期默认为 20 秒，可通过 [`server.graceful-shutdown-timeout`](https://docs.pingcap.com/zh/tidb/v8.5/tikv-configuration-file#graceful-shutdown-timeout-从-v855-版本开始引入) 配置项进行调整。若达到该超时时间后仍有 leader 未完成转移，TiKV 将跳过剩余 leader 的转移，直接进入关闭流程。

	\| TiKV \| [`performance.enable-async-batch-get`](https://docs.pingcap.com/zh/tidb/v8.5/tikv-configuration-file#enable-async-batch-get-从-v855-版本开始引入) \| 新增 \| 控制 TiDB 是否使用异步方式执行 Batch Get 算子，默认值为 `true`。 \|
	\| TiDB \| [`performance.enable-async-batch-get`](https://docs.pingcap.com/zh/tidb/v8.5/tidb-configuration-file#enable-async-batch-get-从-v855-版本开始引入) \| 新增 \| 控制 TiDB 是否使用异步方式执行 Batch Get 算子，默认值为 `true`。 \|

[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

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