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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: TiDB 7.1.1 Release Notes | ||
| summary: 了解 TiDB 7.1.1 版本的兼容性变更、改进提升，以及错误修复。 | ||
| --- | ||
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| # TiDB 7.1.1 Release Notes | ||
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| 发版日期：2023 年 7 月 24 日 | ||
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| TiDB 版本：7.1.1 | ||
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| 试用链接：[快速体验](https://docs.pingcap.com/zh/tidb/v7.1/quick-start-with-tidb) | [生产部署](https://docs.pingcap.com/zh/tidb/v7.1/production-deployment-using-tiup) | [下载离线包](https://cn.pingcap.com/product-community/?version=v7.1.1#version-list) | ||
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| ## 兼容性变更 | ||
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| - 为减小 RocksDB 中 compaction 任务的数据量，TiKV 配置项 [<code>rocksdb.\[defaultcf\|writecf\|lockcf\].compaction-guard-min-output-file-size</code>](/tikv-configuration-file.md#compaction-guard-min-output-file-size) 的默认值从 `"8MB"` 修改为 `"1MB"` [#14888](https://github.com/tikv/tikv/issues/14888) @[tonyxuqqi](https://github.com/tonyxuqqi) | ||
| - TiDB 新增 `tidb_lock_unchanged_keys` 变量用于控制是否对于没有修改的 key 加锁 [#44714](https://github.com/pingcap/tidb/issues/44714) @[ekexium](https://github.com/ekexium) | ||
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| ## 改进提升 | ||
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| + TiDB | ||
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| - 执行计划缓存支持带有超过 200 个参数的查询 [#44823](https://github.com/pingcap/tidb/issues/44823) @[qw4990](https://github.com/qw4990) | ||
| - 优化与落盘相关的 chunk 读取的性能 [#45125](https://github.com/pingcap/tidb/issues/45125) @[YangKeao](https://github.com/YangKeao) | ||
| - 优化构造索引扫描范围的逻辑，支持将一些复杂条件转化为索引扫描范围 [#41572](https://github.com/pingcap/tidb/issues/41572) [#44389](https://github.com/pingcap/tidb/issues/44389) @[xuyifangreeneyes](https://github.com/xuyifangreeneyes) | ||
| - 当 Stale Read 的 retry leader 遇到 lock 时，resolve lock 之后强制重试 leader，避免无谓开销 [#43659](https://github.com/pingcap/tidb/issues/43659) @[you06](https://github.com/you06) | ||
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| + PD | ||
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| - 未开启 Swagger server 时，PD 默认屏蔽 Swagger API [#6786](https://github.com/tikv/pd/issues/6786) @[bufferflies](https://github.com/bufferflies) | ||
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| + Tools | ||
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| + TiCDC | ||
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| - 优化 TiCDC 同步到对象存储时对二进制字段的编码格式 [#9373](https://github.com/pingcap/tiflow/issues/9373) @[CharlesCheung96](https://github.com/CharlesCheung96) | ||
| - 在同步到 Kafka 场景下，支持 OAUTHBEARER 认证方式 [#8865](https://github.com/pingcap/tiflow/issues/8865) @[hi-rustin](https://github.com/hi-rustin) | ||
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| + TiDB Lightning | ||
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| - 改进 TiDB Lightning 在 checksum 阶段对 PD `ClientTSOStreamClosed` 错误的重试逻辑 [#45301](https://github.com/pingcap/tidb/issues/45301) @[lance6716](https://github.com/lance6716) | ||
| - 数据导入完成后使用 SQL 方式校验 checksum，提升数据校验的稳定性 [#41941](https://github.com/pingcap/tidb/issues/41941) @[GMHDBJD](https://github.com/GMHDBJD) | ||
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| + Dumpling | ||
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| - 避免 Dumpling 在使用 `--sql` 参数时执行表查询语句，从而减少导出开销 [#45239](https://github.com/pingcap/tidb/issues/45239) @[lance6716](https://github.com/lance6716) | ||
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| + TiDB Binlog | ||
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| - 优化表信息的获取方式，降低 Drainer 的初始化时间和内存占用 [#1137](https://github.com/pingcap/tidb-binlog/issues/1137) @[lichunzhu](https://github.com/lichunzhu) | ||
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| ## 错误修复 | ||
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| + TiDB | ||
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| - 修复 GC resolve lock 可能错过一些悲观锁的问题 [#45134](https://github.com/pingcap/tidb/issues/45134) @[MyonKeminta](https://github.com/MyonKeminta) | ||
| - 修复创建新会话时 Stats Collector 可能会造成死锁的问题 [#44502](https://github.com/pingcap/tidb/issues/44502) @[xuyifangreeneyes](https://github.com/xuyifangreeneyes) | ||
| - 修复 memory tracker 潜在的泄露问题 [#44612](https://github.com/pingcap/tidb/issues/44612) @[wshwsh12](https://github.com/wshwsh12) | ||
| - 修复 batch coprocessor 重试时可能会生成错误 Region 信息导致查询失败的问题 [#44622](https://github.com/pingcap/tidb/issues/44622) @[windtalker](https://github.com/windtalker) | ||
| - 修复 index scan 中可能存在的数据竞争问题 [#45126](https://github.com/pingcap/tidb/issues/45126) @[wshwsh12](https://github.com/wshwsh12) | ||
| - 修复当开启 `tidb_enable_parallel_apply` 时，MPP 模式下的查询结果出错的问题 [#45299](https://github.com/pingcap/tidb/issues/45299) @[windtalker](https://github.com/windtalker) | ||
| - 修复带 `indexMerge` 的查询被 kill 时可能会 hang 住的问题 [#45279](https://github.com/pingcap/tidb/issues/45279) @[xzhangxian1008](https://github.com/xzhangxian1008) | ||
| - 修复极端情况下，统计 SQL execution detail 的信息占用太多内存导致 TiDB OOM 的问题 [#44047](https://github.com/pingcap/tidb/issues/44047) @[wshwsh12](https://github.com/wshwsh12) | ||
| - 修复对于过长的 SQL 输入，`FormatSQL()` 方法无法正常截断的问题 [#44542](https://github.com/pingcap/tidb/issues/44542) @[hawkingrei](https://github.com/hawkingrei) | ||
| - 修复集群升级过程中，DDL 操作卡住导致升级失败的问题 [#44158](https://github.com/pingcap/tidb/issues/44158) @[zimulala](https://github.com/zimulala) | ||
| - 修复在 TiDB 节点故障后其它 TiDB 节点没有接管 TTL 任务的问题 [#45022](https://github.com/pingcap/tidb/issues/45022) @[lcwangchao](https://github.com/lcwangchao) | ||
| - 修复当使用 MySQL 的 Cursor Fetch 协议时，结果集占用的内存超过 `tidb_mem_quota_query` 的限制导致 TiDB OOM 的问题。修复后，TiDB 会自动将结果集写入磁盘以释放内存资源 [#43233](https://github.com/pingcap/tidb/issues/43233) @[YangKeao](https://github.com/YangKeao) | ||
| - 修复即使用户没有权限，也能查看 `INFORMATION_SCHEMA.TIFLASH_REPLICA` 表信息的问题 [#45320](https://github.com/pingcap/tidb/issues/45320) @[Lloyd-Pottiger](https://github.com/Lloyd-Pottiger) | ||
| - 修复 `ADMIN SHOW DDL JOBS` 语句的返回结果中 `ROW_COUNT` 不准确的问题 [#44044](https://github.com/pingcap/tidb/issues/44044) @[tangenta](https://github.com/tangenta) | ||
| - 修复查询 Range COLUMNS 分区表时可能遇到报错的问题 [#43459](https://github.com/pingcap/tidb/issues/43459) @[mjonss](https://github.com/mjonss) | ||
| - 修复 DDL 任务从暂停状态到恢复时，恢复出错的问题 [#44217](https://github.com/pingcap/tidb/issues/44217) @[dhysum](https://github.com/dhysum) | ||
| - 修复内存悲观锁导致 `FLASHBACK` 失败并且数据不一致的问题 [#44292](https://github.com/pingcap/tidb/issues/44292) @[JmPotato](https://github.com/JmPotato) | ||
| - 修复删除表之后还能从 `INFORMATION_SCHEMA` 读取到该表的问题 [#43714](https://github.com/pingcap/tidb/issues/43714) @[tangenta](https://github.com/tangenta) | ||
| - 修复集群升级前，如果有暂停的 DDL，会出现升级失败的问题 [#44225](https://github.com/pingcap/tidb/issues/44225) @[zimulala](https://github.com/zimulala) | ||
| - 修复通过 BR 恢复 `AUTO_ID_CACHE=1` 的表时，会遇到 `duplicate entry` 报错的问题 [#44716](https://github.com/pingcap/tidb/issues/44716) @[tiancaiamao](https://github.com/tiancaiamao) | ||
| - 修复 DDL owner 切换数次之后导致数据索引不一致的问题 [#44619](https://github.com/pingcap/tidb/issues/44619) @[tangenta](https://github.com/tangenta) | ||
| - 修复当取消处于 `none` 状态的 `ADD INDEX` DDL 任务时，因为后端任务队列没有清理此任务而导致的内存泄漏问题 [#44205](https://github.com/pingcap/tidb/issues/44205) @[tangenta](https://github.com/tangenta) | ||
| - 修复代理协议在处理某些错误数据时报错 `Header read timeout` 的问题 [#43205](https://github.com/pingcap/tidb/issues/43205) @[blacktear23](https://github.com/blacktear23) | ||
| - 修复 PD 隔离可能会导致运行的 DDL 阻塞的问题 [#44267](https://github.com/pingcap/tidb/issues/44267) @[wjhuang2016](https://github.com/wjhuang2016) | ||
| - 修复 `SELECT CAST(n AS CHAR)` 语句中的 `n` 为负数时，查询结果出错的问题 [#44786](https://github.com/pingcap/tidb/issues/44786) @[xhebox](https://github.com/xhebox) | ||
| - 修复创建大量空分区表后内存占用过多的问题 [#44308](https://github.com/pingcap/tidb/issues/44308) @[hawkingrei](https://github.com/hawkingrei) | ||
| - 修复 Join Reorder 可能会造成 Outer Join 结果错误的问题 [#44314](https://github.com/pingcap/tidb/issues/44314) @[AilinKid](https://github.com/AilinKid) | ||
| - 修复包含 CTE 的查询可能导致磁盘可用空间不足的问题 [#44477](https://github.com/pingcap/tidb/issues/44477) @[guo-shaoge](https://github.com/guo-shaoge) | ||
| - 修复删除数据库导致 GC 推进慢的问题 [#33069](https://github.com/pingcap/tidb/issues/33069) @[tiancaiamao](https://github.com/tiancaiamao) | ||
| - 修复在 ingest 模式下创建索引失败的问题 [#44137](https://github.com/pingcap/tidb/issues/44137) @[tangenta](https://github.com/tangenta) | ||
| - 修复当分区表定义中使用了 `FLOOR()` 函数对分区列进行取整时 `SELECT` 语句返回错误的问题 [#42323](https://github.com/pingcap/tidb/issues/42323) @[jiyfhust](https://github.com/jiyfhust) | ||
| - 修复 follower read 未处理 flashback 错误而进行重试，导致查询报错的问题 [#43673](https://github.com/pingcap/tidb/issues/43673) @[you06](https://github.com/you06) | ||
| - 修复 `memTracker` 配合 cursor fetch 使用导致内存泄漏的问题 [#44254](https://github.com/pingcap/tidb/issues/44254) @[YangKeao](https://github.com/YangKeao) | ||
| - 修复 `SHOW PROCESSLIST` 语句无法显示子查询时间较长语句的事务的 TxnStart 的问题 [#40851](https://github.com/pingcap/tidb/issues/40851) @[crazycs520](https://github.com/crazycs520) | ||
| - 修复 `LEADING` hint 不支持查询块别名 (query block alias) 的问题 [#44645](https://github.com/pingcap/tidb/issues/44645) @[qw4990](https://github.com/qw4990) | ||
| - 修复 `PREPARE stmt FROM "ANALYZE TABLE xxx"` 会被 `tidb_mem_quota_query` kill 掉的问题 [#44320](https://github.com/pingcap/tidb/issues/44320) @[chrysan](https://github.com/chrysan) | ||
| - 修复 `processInfo` 为空导致的 panic 问题 [#43829](https://github.com/pingcap/tidb/issues/43829) @[zimulala](https://github.com/zimulala) | ||
| - 修复 `ON UPDATE` 语句没有正确更新主键导致数据索引不一致的问题 [#44565](https://github.com/pingcap/tidb/issues/44565) @[zyguan](https://github.com/zyguan) | ||
| - 修复开启 `tidb_opt_agg_push_down` 时查询可能返回错误结果的问题 [#44795](https://github.com/pingcap/tidb/issues/44795) @[AilinKid](https://github.com/AilinKid) | ||
| - 修复同时使用 CTE 和关联子查询可能导致查询结果出错或者 panic 的问题 [#44649](https://github.com/pingcap/tidb/issues/44649) [#38170](https://github.com/pingcap/tidb/issues/38170) [#44774](https://github.com/pingcap/tidb/issues/44774) @[winoros](https://github.com/winoros) @[guo-shaoge](https://github.com/guo-shaoge) | ||
| - 修复取消处于 rollback 状态的 DDL 任务导致相关元数据出错的问题 [#44143](https://github.com/pingcap/tidb/issues/44143) @[wjhuang2016](https://github.com/wjhuang2016) | ||
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| + PD | ||
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| - 修复 Resource Manager 重复初始化 default 资源组的问题 [#6787](https://github.com/tikv/pd/issues/6787) @[glorv](https://github.com/glorv) | ||
| - 修复 Placement Rules in SQL 设置的 `location-labels` 在特定条件下不按预期调度的问题 [#6662](https://github.com/tikv/pd/issues/6662) @[rleungx](https://github.com/rleungx) | ||
| - 修复在特殊情况下冗余副本无法自动修复的问题 [#6573](https://github.com/tikv/pd/issues/6573) @[nolouch](https://github.com/nolouch) | ||
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| + TiFlash | ||
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| - 修复存算分离模式下，TiFlash 计算节点获取的 CPU 核数信息不准确的问题 [#7436](https://github.com/pingcap/tiflash/issues/7436) @[guo-shaoge](https://github.com/guo-shaoge) | ||
| - 修复 TiFlash 在使用 Online Unsafe Recovery 之后重启时间过长的问题 [#7671](https://github.com/pingcap/tiflash/issues/7671) @[hongyunyan](https://github.com/hongyunyan) | ||
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| + Tools | ||
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| + Backup & Restore (BR) | ||
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| - 修复某些情况下误报 `checksum mismatch` 的问题 [#44472](https://github.com/pingcap/tidb/issues/44472) @[Leavrth](https://github.com/Leavrth) | ||
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| + TiCDC | ||
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| - 修复 PD 异常时可能导致同步任务卡住的问题 [#8808](https://github.com/pingcap/tiflow/issues/8808) [#9054](https://github.com/pingcap/tiflow/issues/9054) @[asddongmen](https://github.com/asddongmen) @[fubinzh](https://github.com/fubinzh) | ||
| - 修复同步到对象存储时内存消耗过大的问题 [#8894](https://github.com/pingcap/tiflow/issues/8894) @[CharlesCheung96](https://github.com/CharlesCheung96) | ||
| - 修复在打开 redo log 且下游出现异常时可能会导致同步任务卡住的问题 [#9172](https://github.com/pingcap/tiflow/issues/9172) @[CharlesCheung96](https://github.com/CharlesCheung96) | ||
| - 修复在下游出现故障时 TiCDC 持续重试导致重试时间过长的问题 [#9272](https://github.com/pingcap/tiflow/issues/9272) @[asddongmen](https://github.com/asddongmen) | ||
| - 修复同步到 Kafka 场景下，读取下游 Metadata 太频繁导致下游压力过大的问题 [#8959](https://github.com/pingcap/tiflow/issues/8959) @[hi-rustin](https://github.com/hi-rustin) | ||
| - 修复当下游为 Kafka 时，TiCDC 查询下游的元信息频率过高导致下游负载过大的问题 [#8957](https://github.com/pingcap/tiflow/issues/8957) [#8959](https://github.com/pingcap/tiflow/issues/8959) @[hi-rustin](https://github.com/hi-rustin) | ||
| - 修复在某些特殊场景下 sorter 组件内存使用过多导致 OOM 的问题 [#8974](https://github.com/pingcap/tiflow/issues/8974) @[hicqu](https://github.com/hicqu) | ||
| - 修复使用 Avro 或 CSV 协议场景下 `UPDATE` 操作不能输出旧值的问题 [#9086](https://github.com/pingcap/tiflow/issues/9086) @[3AceShowHand](https://github.com/3AceShowHand) | ||
| - 修复同步数据到存储服务时，下游 DDL 语句对应的 JSON 文件中没有记录表中字段默认值的问题 [#9066](https://github.com/pingcap/tiflow/issues/9066) @[CharlesCheung96](https://github.com/CharlesCheung96) | ||
| - 修复同步到 TiDB 或 MySQL 场景下，频繁设置下游双向复制相关变量导致下游日志过多的问题 [#9180](https://github.com/pingcap/tiflow/issues/9180) @[asddongmen](https://github.com/asddongmen) | ||
| - 修复当 Kafka 消息过大导致同步出错时，在 Log 中记录了消息体的问题 [#9031](https://github.com/pingcap/tiflow/issues/9031) @[darraes](https://github.com/darraes) | ||
| - 修复 PD 出现网络隔离或 PD Owner 节点重启等故障时 TiCDC 卡住问题 [#8808](https://github.com/pingcap/tiflow/issues/8808) [#8812](https://github.com/pingcap/tiflow/issues/8812) [#8877](https://github.com/pingcap/tiflow/issues/8877) @[asddongmen](https://github.com/asddongmen) | ||
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| + TiDB Data Migration (DM) | ||
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| - 修复 DM-master 在迁移唯一索引包含空列的表时异常退出的问题 [#9247](https://github.com/pingcap/tiflow/issues/9247) @[lance6716](https://github.com/lance6716) | ||
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| + TiDB Lightning | ||
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| - 修复 TiDB Lightning 连接 PD 失败无法重试的问题，提高导入成功率 [#43400](https://github.com/pingcap/tidb/issues/43400) @[lichunzhu](https://github.com/lichunzhu) | ||
| - 修复 TiDB Lightning 写入数据到 TiKV 返回空间不足的错误时无法正确显示错误信息的问题 [#44733](https://github.com/pingcap/tidb/issues/44733) @[lance6716](https://github.com/lance6716) | ||
| - 修复 checksum 过程中报错 `Region is unavailable` 的问题 [#45462](https://github.com/pingcap/tidb/issues/45462) @[D3Hunter](https://github.com/D3Hunter) | ||
| - 修复开启 `experimental.allow-expression-index` 且默认值是 UUID 时导致 TiDB Lightning panic 的问题 [#44497](https://github.com/pingcap/tidb/issues/44497) @[lichunzhu](https://github.com/lichunzhu) | ||
| - 修复竞态条件可能导致磁盘配额 (disk quota) 不准确的问题 [#44867](https://github.com/pingcap/tidb/issues/44867) @[D3Hunter](https://github.com/D3Hunter) | ||
| - 修复逻辑导入模式下，导入期间下游删除表可能导致 TiDB Lightning 元信息未及时更新的问题 [#44614](https://github.com/pingcap/tidb/issues/44614) @[dsdashun](https://github.com/dsdashun) | ||
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| + Dumpling | ||
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| - 修复 Dumpling 在 `--sql` 查询结果集为空时异常退出的问题 [#45200](https://github.com/pingcap/tidb/issues/45200) @[D3Hunter](https://github.com/D3Hunter) | ||
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| + TiDB Binlog | ||
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| - 修复 TiDB 在 PD 地址完全变更后无法通过 `SHOW PUMP STATUS` 或 `SHOW DRAINER STATUS` 正确查询 Binlog 节点状态的问题 [#42643](https://github.com/pingcap/tidb/issues/42643) @[lichunzhu](https://github.com/lichunzhu) | ||
| - 修复 TiDB 在 PD 地址完全变更后无法写 binlog 的问题 [#42643](https://github.com/pingcap/tidb/issues/42643) @[lance6716](https://github.com/lance6716) | ||
| - 修复 etcd client 初始化时没有自动同步最新节点信息的问题 [#1236](https://github.com/pingcap/tidb-binlog/issues/1236) @[lichunzhu](https://github.com/lichunzhu) |
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