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releases: add 5.4.2 release notes #10275

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add 5.4.2 draft
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Update releases/release-5.4.2.md
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1 change: 1 addition & 0 deletions TOC.md
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Expand Up @@ -868,6 +868,7 @@
- v6.0
- [6.0.0-DMR](/releases/release-6.0.0-dmr.md)
- v5.4
- [5.4.2](/releases/release-5.4.2.md)
- [5.4.1](/releases/release-5.4.1.md)
- [5.4.0](/releases/release-5.4.0.md)
- v5.3
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113 changes: 113 additions & 0 deletions releases/release-5.4.2.md
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---
title: TiDB 5.4.2 Release Notes
---

# TiDB 5.4.2 Release Notes

发版日期:2022 年 7 月 8 日

TiDB 版本:5.4.2

## 兼容性更改
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## 兼容性更改


## 提升改进
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+ TiDB

<!--transaction-->
- 避免向非健康状态的 TiKV 节点发送请求,以提升可用性 [#34906](https://github.com/pingcap/tidb/issues/34906)

+ TiKV

- 当 TLS 证书更新时自动重新加载,以提升可用性 [#12546](https://github.com/tikv/tikv/issues/12546)
- 健康检查可以检测到无法正常工作的 Raftstore,使得 TiKV client 可以及时更新 Region Cache [#12398](https://github.com/tikv/tikv/issues/12398)
- 通过将 leader 转让给 CDC observer 减少延迟抖动 [#12111](https://github.com/tikv/tikv/issues/12111)

+ PD

- 默认关闭编译 swagger server [#4932](https://github.com/tikv/pd/issues/4932)

+ Tools

+ TiDB Lightning

- 优化 Scatter Region 为批量模式,提升 Scatter Region 过程的稳定性 [#33618](https://github.com/pingcap/tidb/issues/33618)

## Bug 修复
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+ TiDB

<!--planner-->
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- 修复在 binary protocol 下 Plan Cache 有时会缓存错误的 TableDual 计划的问题 [#34690](https://github.com/pingcap/tidb/issues/34690) [#34678](https://github.com/pingcap/tidb/issues/34678)
- 修复了执行计划在 EqualAll 的情况下,把 TiFlash 的 `firstrow` 聚合函数的 null flag 设错的问题 [#34584](https://github.com/pingcap/tidb/issues/34584)
- 修复了执行处理器为 TiFlash 生成错误的两阶段 aggregate 计划的问题 [#34682](https://github.com/pingcap/tidb/issues/34682)
- 修复了 `tidb_opt_agg_push_down` 和 `tidb_enforce_mpp` 启用时执行处理器的错误行为 [#34465](https://github.com/pingcap/tidb/issues/34465)
- 修复了 Plan Cache 在被 evict 时使用了错误的 memory usage 指标的问题 [#34613](https://github.com/pingcap/tidb/issues/34613)

<!--transaction-->
- 修复了 `LOAD DATA` 语句中列的列表不生效的问题 [#35198](https://github.com/pingcap/tidb/issues/35198)
- 避免在悲观事务中报出 `Write Conflict` 错误 [#11612](https://github.com/tikv/tikv/issues/11612)
- 修复了在遇到 Region error 和网络问题时 prewrite 请求不幂等的问题 [#34875](https://github.com/pingcap/tidb/issues/34875)
- 修复了回滚 async commit 事务可能导致事务不满足原子性的问题 [#33641](https://github.com/pingcap/tidb/issues/33641)

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<!--sql-infra-->
- 如果发生网络连接问题,TiDB 并不总是能正确释放已断开会话所占有的资源。该修复可以确保 TiDB 回滚打开的事务以及释放其他相关资源。[#34722](https://github.com/pingcap/tidb/issues/34722)
- 修复在查询包含 CTE 的视图时,可能误报 `references invalid table` 的问题 [#33965](https://github.com/pingcap/tidb/issues/33965)

<!--diagnosis-->
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- 修复 TiDB 由于 `fatal error: concurrent map read and map write` 发生崩溃的问题 [#35340](https://github.com/pingcap/tidb/issues/35340)

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+ TiKV

- 修复 `max_sample_size` 为 `0` 时 ANALYZE 可能导致 panic 的问题 [#11192](https://github.com/tikv/tikv/issues/11192)
- 修复 TiKV 在退出时可能误报 panic 的问题 [#12231](https://github.com/tikv/tikv/issues/12231)
- 修复在 Region merge 时 source peer 通过 snapshot 追日志时可能导致 panic 的问题 [#12663](https://github.com/tikv/tikv/issues/12663)
- 修复同时分裂和销毁一个 peer 时可能导致 panic 的问题 [#12825](https://github.com/tikv/tikv/issues/12825)
- 修复了 PD 客户端遇到报错时频繁重连的问题 [#12345](https://github.com/tikv/tikv/issues/12345)
- 修复了 `DATETIME` 类型的数据包含小数部分和 `Z` 后缀导致检查报错的问题 [#12739](https://github.com/tikv/tikv/issues/12739)
- 修复了对空字符串进行类型转换导致 TiKV panic 的问题 [#12673](https://github.com/tikv/tikv/issues/12673)
- 修复了在悲观事务中使用 Async Commit 导致重复提交记录的问题 [#12615](https://github.com/tikv/tikv/issues/12615)
- 修复进行 Follower Read 时,可能会报 `invalid store ID 0` 错误的问题 [#12478](https://github.com/tikv/tikv/issues/12478)
- 修复销毁 peer 和批量分裂 Region 之间的竞争导致的 TiKV panic [#12368](https://github.com/tikv/tikv/issues/12368)
- 修复 tikv-ctl 对 `bad-ssts` 结果字符串进行错误匹配的问题 [#12329](https://github.com/tikv/tikv/issues/12329)
- 修复在 aufs 上启动 TiKV 报错的问题 [#12543](https://github.com/tikv/tikv/issues/12543)

+ PD
- 修复 `not leader` 的 status code 有误的问题 [#4797](https://github.com/tikv/pd/issues/4797)
- 修复由于 Hot Region 没有 leader 导致 PD Panic 的问题 [#5005](https://github.com/tikv/pd/issues/5005)
- 修复 PD leader 转移后调度不能立即启动的问题 [#4769](https://github.com/tikv/pd/issues/4769)
- 修复在某些特殊情况下 TSO fallback 的问题 [#4884](https://github.com/tikv/pd/issues/4884)

+ PingCAP/TiFlash
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<!--storage-->
- 修复在 clustered index 表删除列导致 TiFlash 崩溃的问题 [#5154](https://github.com/pingcap/tiflash/issues/5154)
- 修复大量 INSERT 和 DELETE 操作后可能导致 TiFlash 数据不一致的问题 [#4956](https://github.com/pingcap/tiflash/issues/4956</span>)
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<!--compute-->
- 修复极端情况下 decimal 比较结果可能有误的问题 [#4512](https://github.com/pingcap/tiflash/issues/4512)

+ Tools

+ Backup & Restore (BR)

- 修复了 RawKV 模式下 BR 报 `ErrRestoreTableIDMismatch` 错误的问题 [#35279](https://github.com/pingcap/tidb/issues/35279)
- 修复了出现保存文件错误时 BR 没有重试的问题 [#34865](https://github.com/pingcap/tidb/issues/34865)
- 修复了 BR 运行时 panic 的问题 [#34956](https://github.com/pingcap/tidb/issues/34956)
- 修复 BR 无法处理 S3 内部错误的问题 [#34350](https://github.com/pingcap/tidb/issues/34350)
- 修复了当恢复操作遇到一些无法恢复的错误时,BR 被卡住的问题 [#33200](https://github.com/pingcap/tidb/issues/33200)

+ TiCDC

- 修复了增量扫描特殊场景下的数据丢失问题 [#5468](https://github.com/pingcap/tiflow/issues/5468)
- 修复 redo log manager 提前 flush log 的问题 [#5486](https://github.com/pingcap/tiflow/issues/5486)
- 修复当一部分表没有被 redo writer 管理时 resolved ts 提前推进的问题 [#5486](https://github.com/pingcap/tiflow/issues/5486)
- 添加 UUID 作为 redo log file 的后缀以解决文件名冲突引起的数据丢失问题 [#5486](https://github.com/pingcap/tiflow/issues/5486)
- 修复了 Region Leader 丢失时重试超过次数上限后同步中断的问题 [#5230](https://github.com/pingcap/tiflow/issues/5230)
- 修复 MySQL Sink 可能会保存错误的 checkpointTs 的问题 [#5107](https://github.com/pingcap/tiflow/issues/5107)
- 修复了 HTTP server 中潜在的 goroutine 泄露问题 [#5303](https://github.com/pingcap/tiflow/issues/5303)
- 修复了元信息所在 Region 发生变化时可能导致延迟上升的问题 [#4756](https://github.com/pingcap/tiflow/issues/4756) [#4762](https://github.com/pingcap/tiflow/issues/4762)

+ TiDB Data Migration (DM)

- 修复了任务自动恢复后 DM 会占用更大的磁盘空间的问题 [#5344](https://github.com/pingcap/tiflow/issues/5344)
- 修复在未设置 `case-sensitive: true` 时无法同步大写表的问题 [#5255](https://github.com/pingcap/tiflow/issues/5255)
1 change: 1 addition & 0 deletions releases/release-notes.md
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Expand Up @@ -17,6 +17,7 @@ TiDB 历史版本发布声明如下:

## 5.4

- [5.4.2](/releases/release-5.4.2.md)
- [5.4.1](/releases/release-5.4.1.md)
- [5.4.0](/releases/release-5.4.0.md)

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1 change: 1 addition & 0 deletions releases/release-timeline.md
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Expand Up @@ -9,6 +9,7 @@ summary: 了解 TiDB 的版本发布时间线。

| 版本 | 发布日期 |
| :--- | :--- |
| [5.4.2](/releases/release-5.4.2.md) | 2022-07-08 |
| [5.3.2](/releases/release-5.3.2.md) | 2022-06-29 |
| [6.1.0](/releases/release-6.1.0.md) | 2022-06-13 |
| [5.4.1](/releases/release-5.4.1.md) | 2022-05-13 |
Expand Down