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add 6.5.2 release notes #13700

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---
title: TiDB 6.5.2 Release Notes
summary: 了解 TiDB 6.5.2 版本的兼容性变更、改进提升，以及错误修复。
---

# TiDB 6.5.2 Release Notes

发版日期：2023 年 x 月 x 日

TiDB 版本：6.5.2

试用链接：[快速体验](https://docs.pingcap.com/zh/tidb/v6.5/quick-start-with-tidb) | [生产部署](https://docs.pingcap.com/zh/tidb/v6.5/production-deployment-using-tiup) | [下载离线包](https://cn.pingcap.com/product-community/?version=v6.5.2#version-list)

## 兼容性变更

- (dup): release-7.0.0.md > # 行为变更 * TiCDC 修复了 Avro 编码 `FLOAT` 类型数据错误的问题 [#8490](https://github.com/pingcap/tiflow/issues/8490) @[3AceShowHand](https://github.com/3AceShowHand)

在升级 TiCDC 集群到 v6.5.2 或更高的 v6.5.x 版本时，如果使用 Avro 同步的表包含 `FLOAT` 类型数据，请在升级前手动调整 Confluent Schema Registry 的兼容性策略为 `None`，使 changefeed 能够成功更新 schema。否则，在升级之后 changefeed 将无法更新 schema 并进入错误状态。

## 改进提升

+ TiDB

- (dup): release-6.1.6.md > 提升改进> TiDB - Prepared Plan Cache 支持缓存 BatchPointGet 计划 [#42125](https://github.com/pingcap/tidb/issues/42125) @[qw4990](https://github.com/qw4990)
- (dup): release-7.0.0.md > 改进提升> TiDB - Index Join 支持更多的 SQL 格式 [#40505](https://github.com/pingcap/tidb/issues/40505) @[Yisaer](https://github.com/Yisaer)
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- 将 Index Merge Reader 中的一些 Log 等级从 Info 降低为 Debug [#41949](https://github.com/pingcap/tidb/issues/41949) @[yibin87](https://github.com/yibin87)
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- 优化带 limit 的 range partition table 的 distsql concurrency 设置，降低查询延迟 [#41500](https://github.com/pingcap/tidb/pull/41500) @[you06](https://github.com/you06)
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+ TiKV

- note 1
- note 2

+ PD

- note 1
- note 2

+ TiFlash

- 减少了 TiFlash 存储引擎的在读过程中的任务调度的 CPU 消耗 [#6495](https://github.com/pingcap/tiflash/issues/6495) @[JinheLin](https://github.com/JinheLin)
- 显著提升默认参数下用 BR、Lightning 往 TiFlash 导入数据的性能 [#7272](https://github.com/pingcap/tiflash/issues/7272) @[breezewish](https://github.com/breezewish)
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- note 2
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+ Tools

+ Backup & Restore (BR)

- note 1

+ TiCDC

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- 增加 API 2.0 功能 [#8743](https://github.com/pingcap/tiflow/issues/8743) @[sdojjy](https://github.com/sdojjy)
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- (dup): release-7.0.0.md > 改进提升> Tools> TiCDC - 支持在 redo applier 中拆分事务以提升 apply 吞吐，降低灾难场景的 RTO [#8318](https://github.com/pingcap/tiflow/issues/8318) @[CharlesCheung96](https://github.com/CharlesCheung96)
- (dup): release-7.0.0.md > 改进提升> Tools> TiCDC - 支持在 redo log 里 apply DDL 事件 [#8361](https://github.com/pingcap/tiflow/issues/8361) @[CharlesCheung96](https://github.com/CharlesCheung96)

+ TiDB Data Migration (DM)

- note 1

+ TiDB Lightning

- (dup): release-6.6.0.md > 改进提升> Tools> TiDB Lightning - 支持导入带有 BOM header 的 CSV 数据文件 [#40744](https://github.com/pingcap/tidb/issues/40744) @[dsdashun](https://github.com/dsdashun)

+ Dumpling

## 错误修复

+ TiDB

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- (dup): release-6.1.6.md > Bug 修复> TiDB - 修复了生成执行计划过程中，因为获取的 InfoSchema 不一致而导致的 TiDB panic 的问题 [#41622](https://github.com/pingcap/tidb/issues/41622) [@tiancaiamao](https://github.com/tiancaiamao)
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- (dup): release-6.1.6.md > Bug 修复> TiDB - 修复了使用 DDL 修改浮点类型时，保持长度不变且减少小数位后，旧数据仍然保持原样的问题 [#41281](https://github.com/pingcap/tidb/issues/41281) [@zimulala](https://github.com/zimulala)
- (dup): release-6.1.6.md > Bug 修复> TiDB - 修复事务内执行 PointUpdate 之后，`SELECT` 结果不正确的问题 [#28011](https://github.com/pingcap/tidb/issues/28011) @[zyguan](https://github.com/zyguan)
- (dup): release-6.1.6.md > Bug 修复> TiDB - 修复在使用 Cursor Fetch 且在 Execute、Fetch、Close 之间运行其它语句后，Fetch 与 Close 命令可能会返回错误结果或造成 TiDB Panic 的问题 [#40094](https://github.com/pingcap/tidb/issues/40094) [@YangKeao](https://github.com/YangKeao)
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- (dup): release-7.0.0.md > 错误修复> TiDB - 修复 `INSERT IGNORE` 和 `REPLACE` 语句对不修改 value 的 key 没有加锁的问题 [#42121](https://github.com/pingcap/tidb/issues/42121) @[zyguan](https://github.com/zyguan)
- (dup): release-7.0.0.md > 错误修复> TiDB - 修复 TiFlash 执行中遇到生成列会报错的问题 [#40663](https://github.com/pingcap/tidb/issues/40663) @[guo-shaoge](https://github.com/guo-shaoge)
- (dup): release-7.0.0.md > 错误修复> TiDB - 修复当同一个 SQL 中出现多个不同的分区表时，TiDB 可能执行得到错误结果的问题 [#42135](https://github.com/pingcap/tidb/issues/42135) @[mjonss](https://github.com/mjonss)
- (dup): release-7.0.0.md > 错误修复> TiDB - 修复在开启 Prepared Plan Cache 的情况下，索引全表扫可能会报错的问题 [#42150](https://github.com/pingcap/tidb/issues/42150) @[fzzf678](https://github.com/fzzf678)
- (dup): release-7.0.0.md > 错误修复> TiDB - 修复在开启 Prepared Plan Cache 时 Index Merge 可能得到错误结果的问题 [#41828](https://github.com/pingcap/tidb/issues/41828) @[qw4990](https://github.com/qw4990)
- 修复全局内存控制可能 Kill 内存使用量小于 `tidb_server_memory_limit_sess_min_size` 的 SQL 的问题 [#42662](https://github.com/pingcap/tidb/issues/41828) @[XuHuaiyu](https://github.com/XuHuaiyu)
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- 修复分区表动态裁剪模式下 Index Join 可能发生 Panic 的问题 [#40596](https://github.com/pingcap/tidb/issues/40596) @[tiancaiamao](https://github.com/tiancaiamao)
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+ TiKV

- 修复 tikv 解析 cgroup path 没有正确处理 ":" 符号的问题 [#14535](https://github.com/tikv/tikv/pull/14535) @[SpadeA-Tang](https://github.com/SpadeA-Tang)
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+ PD

- (dup): release-6.1.4.md > Bug 修复> PD - 修复 PD 可能会非预期地向 Region 添加多个 Learner 的问题 [#5786](https://github.com/tikv/pd/issues/5786) @[HunDunDM](https://github.com/HunDunDM)
- (dup): release-7.0.0.md > 错误修复> PD - 修复了切换 Placement Rule 时可能存在的 leader 分布不均衡的问题 [#6195](https://github.com/tikv/pd/issues/6195) @[bufferflies](https://github.com/bufferflies)

+ TiFlash

- (dup): release-6.1.6.md > Bug 修复> TiFlash - 修复 TiFlash 无法识别生成列的问题 [#6801](https://github.com/pingcap/tiflash/issues/6801) @[guo-shaoge](https://github.com/guo-shaoge)
- (dup): release-7.0.0.md > 错误修复> TiFlash - 修复了 Decimal 除法在某些情况下最后一位未进位的问题 [#7022](https://github.com/pingcap/tiflash/issues/7022) @[LittleFall](https://github.com/LittleFall)
- (dup): release-7.0.0.md > 错误修复> TiFlash - 修复了 Decimal 转换在某些情况下进位错误的问题 [#6994](https://github.com/pingcap/tiflash/issues/6994) @[windtalker](https://github.com/windtalker)
- (dup): release-7.0.0.md > 错误修复> TiFlash - 修复了开启 new collation 后 TopN/Sort 算子结果可能出错的问题 [#6807](https://github.com/pingcap/tiflash/issues/6807) @[xzhangxian1008](https://github.com/xzhangxian1008)
- 修复由于不兼容 CDC 导致 TiFlash 进程失败的问题 [#7212](https://github.com/pingcap/tiflash/issues/7212) @[hongyunyan](https://github.com/hongyunyan)
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+ Tools

+ Backup & Restore (BR)

- (dup): release-6.6.0.md > 错误修复> Tools> Backup & Restore (BR) - 修复当 TiDB 集群不存在 PITR 备份任务时，`resolve lock` 频率过高的问题 [#40759](https://github.com/pingcap/tidb/issues/40759) @[joccau](https://github.com/joccau)
- (dup): release-7.0.0.md > 错误修复> Tools> Backup & Restore (BR) - 修复了在 PITR 恢复过程中等待 split Region 重试的时间不足的问题 [#42001](https://github.com/pingcap/tidb/issues/42001) @[joccau](https://github.com/joccau)

+ TiCDC


- 修复同步到对象存储时 partition 分隔符不生效问题 [#8581](https://github.com/pingcap/tiflow/issues/8581)
- 修复同步到对象存储场景下，发生表调度可能导致数据丢失问题 [#8256](https://github.com/pingcap/tiflow/issues/8256)
- 修复不可重入的 DDL 带来卡住的问题 [#8662](https://github.com/pingcap/tiflow/issues/8662)
- 修复同步到对象存储场景下，TiCDC 做扩缩容导致数据丢失问题 [#8666](https://github.com/pingcap/tiflow/issues/8666)
- 修复利用 cgroup 在部分场景内存限制不生效问题 [#8588](https://github.com/pingcap/tiflow/issues/8588)
- 修复同步到对象存储场景下，TiCDC 做扩缩容导致数据丢失问题 [#8666](https://github.com/pingcap/tiflow/issues/8666)
- 修复Redo log 在 apply 时，特殊场景可能出现数据丢失的问题 [#8591](https://github.com/pingcap/tiflow/issues/8591)
- 采用 gomemlimit 防止 TiCDC 出现 OOM 问题[#8675](https://github.com/pingcap/tiflow/issues/8675)
- 修复同步到 Kafka( canal-json) 场景下，同步 float 类型字段出现精度丢失问题 [#8490](https://github.com/pingcap/tiflow/issues/8490)
- 采用 multi-statement 的方式优化批量做 update 场景下的同步性能 [#8057](https://github.com/pingcap/tiflow/issues/8057)
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- (dup): release-6.1.6.md > Bug 修复> Tools> TiCDC - 修复 `db sorter` 使用内存时未受 `cgroup memory limit` 限制的问题 [#8588](https://github.com/pingcap/tiflow/issues/8588) @[amyangfei](https://github.com/amyangfei)
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- (dup): release-6.1.6.md > Bug 修复> Tools> TiCDC - 修复同步数据时由于 `UPDATE` 和 `INSERT` 语句乱序可能导致 `Duplicate entry` 错误的问题 [#8597](https://github.com/pingcap/tiflow/issues/8597) @[sdojjy](https://github.com/sojjy)
- (dup): release-6.1.6.md > Bug 修复> Tools> TiCDC - 修复由于 PD 和 TiCDC 之间的网络隔离引起 TiCDC 程序异常退出的问题 [#8562](https://github.com/pingcap/tiflow/issues/8562) @[overvenus](https://github.com/overvenus)
- (dup): release-7.0.0.md > 错误修复> Tools> TiCDC - 修复了 Kubernetes 上不能平滑升级 (graceful upgrade) TiCDC 集群的问题 [#8484](https://github.com/pingcap/tiflow/issues/8484) @[overvenus](https://github.com/overvenus)
- (dup): release-7.0.0.md > 错误修复> Tools> TiCDC - 修复了当所有 Kafka server 不可访问时会导致 TiCDC server panic 的问题 [#8523](https://github.com/pingcap/tiflow/issues/8523) @[3AceShowHand](https://github.com/3AceShowHand)
- (dup): release-7.0.0.md > 错误修复> Tools> TiCDC - 修复了重启 changefeed 可能导致数据丢失或者 checkpoint 无法推进的问题 [#8242](https://github.com/pingcap/tiflow/issues/8242) @[overvenus](https://github.com/overvenus)

+ TiDB Data Migration (DM)

- note 1

+ TiDB Lightning

- note 1

+ Dumpling