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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: TiDB 6.5.5 Release Notes | ||
| summary: 了解 TiDB 6.5.5 版本的改进提升与错误修复。 | ||
| --- | ||
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| # TiDB 6.5.5 Release Notes | ||
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| 发版日期：2023 年 9 月 21 日 | ||
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| TiDB 版本：6.5.5 | ||
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| 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=v6.5.5#version-list) | ||
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| ## 改进提升 | ||
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| + TiDB | ||
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| - 新增部分优化器提示，包括 [`NO_MERGE_JOIN()`](https://docs.pingcap.com/zh/tidb/v6.5/optimizer-hints#no_merge_joint1_name--tl_name-)、[`NO_INDEX_JOIN()`](https://docs.pingcap.com/zh/tidb/v6.5/optimizer-hints#no_index_joint1_name--tl_name-)、[`NO_INDEX_MERGE_JOIN()`](https://docs.pingcap.com/zh/tidb/v6.5/optimizer-hints#no_index_merge_joint1_name--tl_name-)、[`NO_HASH_JOIN()`](https://docs.pingcap.com/zh/tidb/v6.5/optimizer-hints#no_hash_joint1_name--tl_name-)、[`NO_INDEX_HASH_JOIN()`](https://docs.pingcap.com/zh/tidb/v6.5/optimizer-hints#no_index_hash_joint1_name--tl_name-) [#45520](https://github.com/pingcap/tidb/issues/45520) @[qw4990](https://github.com/qw4990) | ||
| - 添加 coprocessor 相关的 request source 信息 [#46514](https://github.com/pingcap/tidb/issues/46514) @[you06](https://github.com/you06) | ||
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| + TiKV | ||
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| - 新增 PD Client 连接重试过程中的 backoff 机制。异常错误重试期间，逐步增加重试时间间隔，减小 PD 压力 [#15428](https://github.com/tikv/tikv/issues/15428) @[nolouch](https://github.com/nolouch) | ||
| - 增加 snapshot 相关的监控指标 [#15401](https://github.com/tikv/tikv/issues/15401) @[SpadeA-Tang](https://github.com/SpadeA-Tang) | ||
| - 提高 PITR checkpoint lag 在 leader 转移时的稳定性 [#13638](https://github.com/tikv/tikv/issues/13638) @[YuJuncen](https://github.com/YuJuncen) | ||
| - 增加 `safe-ts` 相关的日志和监控指标 [#15082](https://github.com/tikv/tikv/issues/15082) @[ekexium](https://github.com/ekexium) | ||
| - 为 `resolved-ts` 提供更多的相关日志和监控指标 [#15082](https://github.com/tikv/tikv/issues/15082) @[ekexium](https://github.com/ekexium) | ||
| - 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) | ||
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| + Tools | ||
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| + Backup & Restore (BR) | ||
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| - 减少日志备份 `resolve lock` 的 CPU 开销 [#40759](https://github.com/pingcap/tidb/issues/40759) @[3pointer](https://github.com/3pointer) | ||
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| ## 错误修复 | ||
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| + TiDB | ||
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| - 修复 Stale Read 可能选择不可用副本的问题 [#46198](https://github.com/pingcap/tidb/issues/46198) @[zyguan](https://github.com/zyguan) | ||
| - 修复 Stale Read 和 Schema Cache 不适配导致额外开销的问题 [#43481](https://github.com/pingcap/tidb/issues/43481) @[crazycs520](https://github.com/crazycs520) | ||
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| + TiKV | ||
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| - 修复当一个 TiKV 节点失败时，对应 Region 的 peers 错误地进入休眠模式的问题 [#14547](https://github.com/tikv/tikv/issues/14547) @[hicqu](https://github.com/hicqu) | ||
| - 修复开启 Titan 后，TiKV 遇到 `Blob file deleted twice` 报错无法正常启动的问题 [#15454](https://github.com/tikv/tikv/issues/15454) @[Connor1996](https://github.com/Connor1996) | ||
| - 修复 Online Unsafe Recovery 时无法处理 merge abort 的问题 [#15580](https://github.com/tikv/tikv/issues/15580) @[v01dstar](https://github.com/v01dstar) | ||
| - 修复 PD 和 TiKV 之间的网络中断可能导致 PITR 卡住的问题 [#15279](https://github.com/tikv/tikv/issues/15279) @[YuJuncen](https://github.com/YuJuncen) | ||
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| + PD | ||
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| - 修复调度器启动时间长的问题 [#6920](https://github.com/tikv/pd/issues/6920) @[HuSharp](https://github.com/HuSharp) | ||
| - 修复 Scatter Region 处理 Leader 和 Peer 的逻辑不一致的问题 [#6962](https://github.com/tikv/pd/issues/6962) @[bufferflies](https://github.com/bufferflies) | ||
| - 修复集群重启或者 PD Leader 切换时，空 Region 数量监控指标异常的问题 [#7008](https://github.com/tikv/pd/issues/7008) @[CabinfeverB](https://github.com/CabinfeverB) | ||
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| + Tools | ||
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| + Backup & Restore (BR) | ||
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| - 修复 PITR 恢复隐式主键可能冲突的问题 [#46520](https://github.com/pingcap/tidb/issues/46520) @[3pointer](https://github.com/3pointer) | ||
| - 修复 PITR 恢复 meta-kv 出错的问题 [#46578](https://github.com/pingcap/tidb/issues/46578) @[Leavrth](https://github.com/Leavrth) | ||
| - 修复 BR 集成测试用例出错的问题 [#45561](https://github.com/pingcap/tidb/issues/46561) @[purelind](https://github.com/purelind) | ||
| - 缓解了 Region leadership 迁移导致 PITR 日志备份进度延迟变高的问题 [#13638](https://github.com/tikv/tikv/issues/13638) @[YuJuncen](https://github.com/YuJuncen) | ||
| - 修复 GCS 上 PITR 恢复失败的问题 [#47022](https://github.com/pingcap/tidb/issues/47022) @[Leavrth](https://github.com/Leavrth) | ||
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| + TiCDC | ||
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| - 修复 PD 节点出现网络隔离时引起 TiCDC 同步延时变高的问题 [#9565](https://github.com/pingcap/tiflow/issues/9565) @[asddongmen](https://github.com/asddongmen) | ||
| - 修复采用 CSV 格式时将 `UPDATE` 操作错误修改为 `INSERT` 的问题 [#9658](https://github.com/pingcap/tiflow/issues/9658) @[3AceShowHand](https://github.com/3AceShowHand) | ||
| - 修复在部分日志中记录了用户密码的问题 [#9690](https://github.com/pingcap/tiflow/issues/9690) @[sdojjy](https://github.com/sdojjy) | ||
| - 修复使用 SASL 认证时可能导致 TiCDC 出现 panic 的问题 [#9669](https://github.com/pingcap/tiflow/issues/9669) @[sdojjy](https://github.com/sdojjy) | ||
| - 修复 TiCDC 同步任务在某些特殊场景可能失败的问题 [#9685](https://github.com/pingcap/tiflow/issues/9685) [#9697](https://github.com/pingcap/tiflow/issues/9697) [#9695](https://github.com/pingcap/tiflow/issues/9695) [#9736](https://github.com/pingcap/tiflow/issues/9736) @[hicqu](https://github.com/hicqu) @[CharlesCheung96](https://github.com/CharlesCheung96) | ||
| - 修复上游在 Region 非常多时，TiKV 节点出现故障导致 TiCDC 同步任务不能快速恢复的问题 [#9741](https://github.com/pingcap/tiflow/issues/9741) @[sdojjy](https://github.com/sdojjy) | ||
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| + TiDB Lightning | ||
| - 修复 TiDB Lightning 在目标服务器部署 TiCDC 时无法启动的问题 [#41040](https://github.com/pingcap/tidb/issues/41040) @[lance6716](https://github.com/lance6716) | ||
| - 修复 TiDB Lightning 在 PD 拓扑变更时无法启动的问题 [#46688](https://github.com/pingcap/tidb/issues/46688) @[lance6716](https://github.com/lance6716) | ||
| - 修复 TiDB Lightning 在 PD 切换 Leader 后无法继续导入数据的问题 [#46540](https://github.com/pingcap/tidb/issues/46540) @[lance6716](https://github.com/lance6716) | ||
| - 修复 precheck 无法准确检测目标集群是否存在运行中的 TiCDC 的问题 [#41040](https://github.com/pingcap/tidb/issues/41040) @[lance6716](https://github.com/lance6716) |
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