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v6.5.6: add release notes #15525

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merged 52 commits into from
Dec 7, 2023
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v6.5.6: add release notes #15525

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169 changes: 169 additions & 0 deletions releases/release-6.5.6.md
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---
title: TiDB 6.5.6 Release Notes
summary: 了解 TiDB 6.5.6 版本的兼容性变更、改进提升，以及错误修复。
---

# TiDB 6.5.6 Release Notes

发版日期：2023 年 x 月 x 日

TiDB 版本：6.5.6

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=v6.5.6#version-list)

## 兼容性变更

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## 改进提升

+ TiDB

- 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})
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+ TiKV

- note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- (dup): release-7.4.0.md > 改进提升> TiKV - 改进 Resolver 的内存使用，防止 OOM [#15458](https://github.com/tikv/tikv/issues/15458) @[overvenus](https://github.com/overvenus)
- (dup): release-7.1.2.md > 改进提升> TiKV - 优化数据整理检查机制，当触发 Region Split 时，如果没有可以分裂的 key，触发一次数据整理，以消除过多的 MVCC 版本 [#15282](https://github.com/tikv/tikv/issues/15282) @[SpadeA-Tang](https://github.com/SpadeA-Tang)
- (dup): release-7.4.0.md > 改进提升> TiKV - 消除 Router 对象中的 LRUCache，降低内存占用，防止 OOM [#15430](https://github.com/tikv/tikv/issues/15430) @[Connor1996](https://github.com/Connor1996)
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+ PD

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

+ TiFlash

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

+ Tools

+ Backup & Restore (BR)

- 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})
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+ TiCDC
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- note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- (dup): release-7.4.0.md > 改进提升> Tools> TiCDC - 优化同步 `ADD INDEX` DDL 的执行逻辑，从而不阻塞后续的 DML 语句 [#9644](https://github.com/pingcap/tiflow/issues/9644) @[sdojjy](https://github.com/sdojjy)

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+ TiDB Data Migration (DM)

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

+ TiDB Lightning

- 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})

+ Dumpling

- 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})

+ TiUP

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

+ TiDB Binlog

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

## 错误修复

+ TiDB

- 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-7.4.0.md > 错误修复> TiDB - 修复 `AUTO_ID_CACHE=1` 时可能导致 `Duplicate entry` 的问题 [#46444](https://github.com/pingcap/tidb/issues/46444) @[tiancaiamao](https://github.com/tiancaiamao)
- (dup): release-7.4.0.md > 错误修复> TiDB - 修复当 JOIN 两个子查询时执行 `TIDB_INLJ` Hint 不生效的问题 [#46160](https://github.com/pingcap/tidb/issues/46160) @[qw4990](https://github.com/qw4990)
- (dup): release-7.1.2.md > 错误修复> TiDB - 修复 TiDB 重启后 DDL 操作可能卡住的问题 [#46751](https://github.com/pingcap/tidb/issues/46751) @[wjhuang2016](https://github.com/wjhuang2016)
- (dup): release-7.1.2.md > 错误修复> TiDB - 修复由于 MDL 处理不正确可能导致 DDL 永久阻塞的问题 [#46920](https://github.com/pingcap/tidb/issues/46920) @[wjhuang2016](https://github.com/wjhuang2016)
- (dup): release-7.4.0.md > 错误修复> TiDB - 修复 `MERGE_JOIN` 的结果错误的问题 [#46580](https://github.com/pingcap/tidb/issues/46580) @[qw4990](https://github.com/qw4990)
- (dup): release-7.1.2.md > 错误修复> TiDB - 修复 Sort 算子在落盘过程中可能导致 TiDB 崩溃的问题 [#47538](https://github.com/pingcap/tidb/issues/47538) @[windtalker](https://github.com/windtalker)
- (dup): release-7.4.0.md > 错误修复> TiDB - 修复 `cast(col)=range` 条件在 CAST 无精度损失的情况下会导致 FullScan 的问题 [#45199](https://github.com/pingcap/tidb/issues/45199) @[AilinKid](https://github.com/AilinKid)
- (dup): release-7.1.2.md > 错误修复> TiDB - 修复 `RENAME TABLE` 操作导致表中出现重复列的问题 [#47064](https://github.com/pingcap/tidb/issues/47064) @[jiyfhust](https://github.com/jiyfhust)
- (dup): release-7.1.2.md > 错误修复> TiDB - 修复 `client-go` 中 `batch-client` panic 的问题 [#47691](https://github.com/pingcap/tidb/issues/47691) @[crazycs520](https://github.com/crazycs520)
- (dup): release-7.1.2.md > 错误修复> TiDB - 禁止非整型聚簇索引进行 split table 操作 [#47350](https://github.com/pingcap/tidb/issues/47350) @[tangenta](https://github.com/tangenta)
- (dup): release-7.1.0.md > 错误修复> TiDB - 修复时间转换时 Prepared Plan Cache 与 Non-Prepared Plan Cache 的行为不兼容性的问题 [#42439](https://github.com/pingcap/tidb/issues/42439) @[qw4990](https://github.com/qw4990)
- (dup): release-6.6.0.md > 错误修复> TiDB - 修复了部分情况下空表无法使用 ingest 模式添加索引的问题 [#39641](https://github.com/pingcap/tidb/issues/39641) @[tangenta](https://github.com/tangenta)
- (dup): release-7.4.0.md > 错误修复> TiDB - 修复交换分区时，无法检测出不符合分区定义的数据的问题 [#46492](https://github.com/pingcap/tidb/issues/46492) @[mjonss](https://github.com/mjonss)
- (dup): release-7.4.0.md > 错误修复> TiDB - 修复 `group_concat` 无法解析 `ORDER BY` 列的问题 [#41986](https://github.com/pingcap/tidb/issues/41986) @[AilinKid](https://github.com/AilinKid)
- (dup): release-7.4.0.md > 错误修复> TiDB - 修复深嵌套的表达式的 HashCode 重复计算导致的高内存占用和 OOM 问题 [#42788](https://github.com/pingcap/tidb/issues/42788) @[AilinKid](https://github.com/AilinKid)
- (dup): release-7.4.0.md > 错误修复> TiDB - 修复 MPP 执行计划中通过 Union 下推 Aggregation 导致的结果错误 [#45850](https://github.com/pingcap/tidb/issues/45850) @[AilinKid](https://github.com/AilinKid)
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+ TiKV
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- note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- note [#issue](https://github.com/tikv/tikv/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- (dup): release-7.1.2.md > 错误修复> TiKV - 修复在移动 Peer 时可能导致 Follower Read 性能变差的问题 [#15468](https://github.com/tikv/tikv/issues/15468) @[YuJuncen](https://github.com/YuJuncen)
- (dup): release-7.4.0.md > 错误修复> TiKV - 修复 raftstore-applys 不断增长的数据错误 [#15371](https://github.com/tikv/tikv/issues/15371) @[Connor1996](https://github.com/Connor1996)
- (dup): release-7.1.2.md > 错误修复> TiKV - 修复有线上负载时，TiDB Lightning 的 Checksum Coprocessor 请求超时的问题 [#15565](https://github.com/tikv/tikv/issues/15565) @[lance6716](https://github.com/lance6716)

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+ PD

- note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- note [#issue](https://github.com/tikv/pd/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- (dup): release-7.1.2.md > 错误修复> PD - 修复 Plugin 目录、文件内容可能存在安全隐患的问题 [#7094](https://github.com/tikv/pd/issues/7094) @[HuSharp](https://github.com/HuSharp)
- (dup): release-7.4.0.md > 错误修复> PD - 修复修改隔离等级时未同步到默认放置规则中的问题 [#7121](https://github.com/tikv/pd/issues/7121) @[rleungx](https://github.com/rleungx)
- (dup): release-7.1.2.md > 错误修复> PD - 修复 `evict-leader-scheduler` 丢失配置的问题 [#6897](https://github.com/tikv/pd/issues/6897) @[HuSharp](https://github.com/HuSharp)

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+ TiFlash

- note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
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- note [#issue](https://github.com/pingcap/tiflash/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
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- (dup): release-7.1.2.md > 错误修复> TiFlash - 修复 MemoryTracker 提供的内存使用数据不准确的问题 [#8128](https://github.com/pingcap/tiflash/issues/8128) @[JinheLin](https://github.com/JinheLin)

+ Tools

+ Backup & Restore (BR)

- 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-7.1.2.md > 错误修复> Tools> Backup & Restore (BR) - 修复 1 分钟之内多次执行 PITR 可能导致数据丢失的问题 [#15483](https://github.com/tikv/tikv/issues/15483) @[YuJuncen](https://github.com/YuJuncen)
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+ TiCDC

- note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
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- note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- (dup): release-7.4.0.md > 错误修复> Tools> TiCDC - 修复 PD 做扩缩容场景下 TiCDC 访问无效旧地址的问题 [#9584](https://github.com/pingcap/tiflow/issues/9584) @[fubinzh](https://github.com/fubinzh) @[asddongmen](https://github.com/asddongmen)
- (dup): release-7.1.2.md > 错误修复> Tools> TiCDC - 修复在某些特殊的操作系统下，获取错误内存信息可能导致 OOM 的问题 [#9762](https://github.com/pingcap/tiflow/issues/9762) @[sdojjy](https://github.com/sdojjy)

+ TiDB Data Migration (DM)

- note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- note [#issue](https://github.com/pingcap/tiflow/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
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- (dup): release-7.4.0.md > 错误修复> Tools> TiDB Data Migration (DM) - 修复 DM 在乐观模式中跳过 Partition DDL 的问题 [#9788](https://github.com/pingcap/tiflow/issues/9788) @[GMHDBJD](https://github.com/GMHDBJD)
- (dup): release-7.4.0.md > 错误修复> Tools> TiDB Data Migration (DM) - 修复 DM 在跳过 Online DDL 时无法正确追踪上游表结构的问题 [#9587](https://github.com/pingcap/tiflow/issues/9587) @[GMHDBJD](https://github.com/GMHDBJD)
- (dup): release-7.4.0.md > 错误修复> Tools> TiDB Data Migration (DM) - 修复 DM 在跳过失败 DDL 并且后续无 DDL 执行时显示延迟持续增长的问题 [#9605](https://github.com/pingcap/tiflow/issues/9605) @[D3Hunter](https://github.com/D3Hunter)
- (dup): release-7.4.0.md > 错误修复> Tools> TiDB Data Migration (DM) - 修复 DM 在乐观模式恢复任务时跳过所有 DML 的问题 [#9588](https://github.com/pingcap/tiflow/issues/9588) @[GMHDBJD](https://github.com/GMHDBJD)

+ TiDB Lightning

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

- 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})

+ TiUP

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

+ TiDB Binlog

- note [#issue](https://github.com/pingcap/tidb-binlog/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- note [#issue](https://github.com/pingcap/tidb-binlog/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- (dup): release-7.1.2.md > 错误修复> Tools> TiDB Binlog - 修复传输事务超过 1 GB 时 Drainer 会退出的问题 [#28659](https://github.com/pingcap/tidb/issues/28659) @[jackysp](https://github.com/jackysp)
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