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releases: add tidb 5.2.2 release notes #7311

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releases: add tidb 5.2.2 release notes #7311

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1 change: 1 addition & 0 deletions TOC.md
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Expand Up @@ -550,6 +550,7 @@
+ 版本发布历史
+ [发布版本汇总](/releases/release-notes.md)
+ v5.2
- [5.2.2](/releases/release-5.2.2.md)
- [5.2.1](/releases/release-5.2.1.md)
- [5.2.0](/releases/release-5.2.0.md)
+ v5.1
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23 changes: 23 additions & 0 deletions releases/release-5.2.2.md
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---
title: TiDB 5.2.2 Release Notes
---

# TiDB 5.2.2 Release Notes

发版日期：2021 年 10 月 27 日

TiDB 版本：5.2.2

## 兼容性更改

## 功能增强

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## 提升改进
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## Bug 修复

+ TiDB
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+ TiFlash
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+ PD
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@rleungx rleungx Oct 21, 2021 •
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- 修复因为超过副本配置数量而错误删除有数据且处于 `pending` 状态的副本的问题 [#4075](https://github.com/tikv/pd/pull/4075)
- 修复 `down peer` 无法及时修复的问题 [#4084](https://github.com/tikv/pd/pull/4084)
- 修复 `scatter range` 调度器无法对空 `region` 进行调度的问题 [#4118](https://github.com/tikv/pd/pull/4118)
- 修复 `key manager` 占用过多 CPU 的问题 [#4153](https://github.com/tikv/pd/pull/4153)
- 修复热点调度器变更配置过程中可能存在的数据竞争问题 [#4170](https://github.com/tikv/pd/pull/4170)
- 修复 `region syncer` 卡住导致 `leader` 选举慢的问题 [#4220](https://github.com/tikv/pd/pull/4220)

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@zier-one zier-one Oct 25, 2021 •
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+ PD
+ PD
# TiCDC
## 提升改进
- 将 Kafka sink 配置项默认值由 `MaxMessageBytes` 64MB 改为 1MB，消息因体积过大而被 Kafka Broker 拒收。[#3104](https://github.com/pingcap/ticdc/pull/3104)
- 降低同步链路中的内存占用 [#3037](https://github.com/pingcap/ticdc/pull/3037) [#2726](https://github.com/pingcap/ticdc/pull/2726) [#2642](https://github.com/pingcap/ticdc/pull/2642)
- 优化监控项和告警规则，提升了同步链路、内存 GC、存量数据扫描过程的可观测性。[#2735](https://github.com/pingcap/ticdc/pull/2735) [#2828](https://github.com/pingcap/ticdc/pull/2828) [#3000](https://github.com/pingcap/ticdc/pull/3000 [#3035](https://github.com/pingcap/ticdc/pull/3035) [#3026](https://github.com/pingcap/ticdc/pull/3026)
- 当同步任务状态正常时，不再显示历史上的错误信息，避免误导用户。[#2979]https://github.com/pingcap/ticdc/pull/2979
## Bug 修复
- 修复当上游 TiDB 实例意外退出时，TiCDC 同步任务推进可能停滞的问题。[#3102](https://github.com/pingcap/ticdc/pull/3102)
- 修复 TiCDC 进程 PANIC `tikv reported duplicated request to the same region, which is not expected`。[#3093](https://github.com/pingcap/ticdc/pull/3093)
- 修复在验证下游 TiDB/MySQL 可用性时导致的无意义的 CPU 消耗。[#3077](https://github.com/pingcap/ticdc/pull/3077)
- 修复 TiCDC 产生的 Kafka 消息体积不受 `max-message-size` 约束的问题。[#3049](https://github.com/pingcap/ticdc/pull/3049)
- 修复当写入 Kafka 消息发生错误时，TiCDC 同步任务推进可能停滞的问题。[#3018](https://github.com/pingcap/ticdc/pull/3018)
- 修复当开启 `force-replicate` 时，可能有些没有有效索引的分区表被非预期的忽略的问题。[#2866](https://github.com/pingcap/ticdc/pull/2866)
- 修复当扫描存量数据耗时过长时，可能由于 TiKV 进行 GC 而导致存量数据扫描失败的问题。[#2854](https://github.com/pingcap/ticdc/pull/2854)
- 修复在将某些类型的列编码为 Open Protocol 格式时，TiCDC 进程可能 PANIC `interface conversion: interface {} is string, not []uint8`。[#2784](https://github.com/pingcap/ticdc/pull/2784)
- 修复在将某些类型的列编码为 Avro 格式时，TiCDC 进程可能 PANIC `interface conversion: interface {} is uint64, not int64`。[#2657](https://github.com/pingcap/ticdc/pull/2657)
# TiDB-Binlog
## Bug 修复
- 修复当大部分表被过滤掉时，在某些特殊的负载下，checkpoint 不更新的问题。[#1075](https://github.com/pingcap/tidb-binlog/pull/1075)

1 change: 1 addition & 0 deletions releases/release-notes.md
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Expand Up @@ -9,6 +9,7 @@ TiDB 历史版本发布声明如下：

## 5.2

- [5.2.2](/releases/release-5.2.2.md)
- [5.2.1](/releases/release-5.2.1.md)
- [5.2.0](/releases/release-5.2.0.md)

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