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releases notes: add 5.1.2 release notes (#7149)
* releases: add tidb 5.1.2-10-06-33 release notes * Update release-5.1.2.md * Update releases/release-5.1.2.md * add notes from comments * Create release-5.1.2.md * Apply suggestions from code review Co-authored-by: Liuxiaozhen12 <[email protected]> Co-authored-by: Enwei <[email protected]> Co-authored-by: Grace Cai <[email protected]> Co-authored-by: xixirangrang <[email protected]> * Update releases/release-5.1.2.md Co-authored-by: shichun-0415 <[email protected]> * Update releases/release-5.1.2.md Co-authored-by: shichun-0415 <[email protected]> * Apply suggestions from code review Co-authored-by: Yuanjia Zhang <[email protected]> * Apply suggestions from code review * replace pr number with the corresponding issue number * Update releases/release-5.1.2.md * Apply suggestions from code review * Apply suggestions from code review * Apply suggestions from code review * Update releases/release-5.1.2.md * Update releases/release-5.1.2.md Co-authored-by: Enwei <[email protected]> * Update releases/release-5.1.2.md Co-authored-by: Enwei <[email protected]> * fix * Update releases/release-5.1.2.md * Update releases/release-5.1.2.md Co-authored-by: Liuxiaozhen12 <[email protected]> * Update releases/release-5.1.2.md * Update releases/release-5.1.2.md * Apply suggestions from code review all these changes are from the 5.2 release notes * Update releases/release-5.1.2.md * Update releases/release-5.1.2.md * apply suggestions * Update releases/release-5.1.2.md Co-authored-by: Enwei <[email protected]> * Update releases/release-5.1.2.md Co-authored-by: Enwei <[email protected]> * Update releases/release-5.1.2.md * Apply suggestions from code review * Update releases/release-5.1.2.md * Update releases/release-5.1.2.md * move notes Co-authored-by: TomShawn <[email protected]> Co-authored-by: Enwei <[email protected]> Co-authored-by: Grace Cai <[email protected]> Co-authored-by: xixirangrang <[email protected]> Co-authored-by: shichun-0415 <[email protected]> Co-authored-by: Yuanjia Zhang <[email protected]>
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| --- | ||
| title: TiDB 5.1.2 Release Notes | ||
| --- | ||
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| # TiDB 5.1.2 Release Notes | ||
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| 发版日期：2021 年 9 月 27 日 | ||
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| TiDB 版本：5.1.2 | ||
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| ## 兼容性更改 | ||
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| + TiDB | ||
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| + 以下 Bug 修复涉及执行结果变化，可能引起兼容性变化： | ||
| - 修复了 `greatest(datetime) union null` 返回空字符串的问题 [#26532](https://github.com/pingcap/tidb/issues/26532) | ||
| - 修复了 `having` 子句可能执行错误的问题 [#26496](https://github.com/pingcap/tidb/issues/26496) | ||
| - 修复了当 `between` 表达式两边的 collation 不一致会导致查询结果错误的问题 [#27146](https://github.com/pingcap/tidb/issues/27146) | ||
| - 修复了当 `group_concat` 函数包含非 `bin` 的 collation 时查询结果错误的问题 [#27429](https://github.com/pingcap/tidb/issues/27429) | ||
| - 修复了当开启 New Collation 时，在多列上执行 `count(distinct)` 表达式结果错误的问题 [#27091](https://github.com/pingcap/tidb/issues/27091) | ||
| - 修复了 `extract` 函数的参数是负数时查询结果错误的问题 [#27236](https://github.com/pingcap/tidb/issues/27236) | ||
| - 修复了当 `SQL_MODE` 为 'STRICT_TRANS_TABLES' 时，插入非法时间不报错的问题 [#26762](https://github.com/pingcap/tidb/issues/26762) | ||
| - 修复了当 `SQL_MODE` 为 'NO_ZERO_IN_DATE' 时，使用非法的默认时间不报错的问题 [#26766](https://github.com/pingcap/tidb/issues/26766) | ||
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| + Tools | ||
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| + TiCDC | ||
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| - 将兼容版本从 `5.1.0-alpha` 改为 `5.2.0-alpha` [#2659](https://github.com/pingcap/ticdc/pull/2659) | ||
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| ## 改进提升 | ||
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| + TiDB | ||
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| - 根据直方图行数来触 auto-analyze，提升 auto-analyze 触发的准确度 [#24237](https://github.com/pingcap/tidb/issues/24237) | ||
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| + TiKV | ||
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| - 支持动态更改 TiCDC 配置项 [#10645](https://github.com/tikv/tikv/issues/10645) | ||
| - 减少 Resolved TS 消息的大小以节省网络带宽 [#2448](https://github.com/pingcap/ticdc/issues/2448) | ||
| - 支持限制每个 Store 发送的心跳包信息中 peer stats 的数量 [#10621](https://github.com/tikv/tikv/pull/10621) | ||
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| + PD | ||
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| - 存在 scatter range 调度器情况下，允许空 Region 被调度，并可以在该调度器中使用单独的 `tolerance` 配置项 [#4117](https://github.com/tikv/pd/pull/4117) | ||
| - 提升 PD 之间同步 Region 信息的性能 [#3933](https://github.com/tikv/pd/pull/3933) | ||
| - 支持根据 Operator 的生成情况动态调整 Store 的重试次数 [#3744](https://github.com/tikv/pd/issues/3744) | ||
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| + TiFlash | ||
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| - 支持 `DATE()` 函数 | ||
| - 为 Grafana 面板增加每个实例的写入吞吐 | ||
| - 优化 `leader-read` 流程的性能 | ||
| - 加速 MPP 任务取消的流程 | ||
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| + Tools | ||
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| + TiCDC | ||
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| - 当统一分类器使用内存进行分类时，优化内存管理 [#2553](https://github.com/pingcap/ticdc/issues/2553) | ||
| - 当并发性高时，优化 workerpool 以减少 goroutines 的数量 [#2488](https://github.com/pingcap/ticdc/pull/2488) | ||
| - 当一个表的区域从一个 TiKV 节点转移出去时，减少 goroutine 的使用 [#2284](https://github.com/pingcap/ticdc/issues/2284) | ||
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| + Dumpling | ||
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| - 支持备份一些无法执行 `START TRANSACTION ... WITH CONSISTENT SNAPSHOT` 和 `SHOW CREATE TABLE` 语句的 MySQL 兼容数据库 [#309](https://github.com/pingcap/dumpling/issues/309) | ||
| - 添加一个全局 gRPC 连接池并在 KV 客户端之间共享 gRPC 连接 [#2534](https://github.com/pingcap/ticdc/pull/2534) | ||
| - 禁止跨主要和次要版本操作 TiCDC 集群 [#2599](https://github.com/pingcap/ticdc/pull/2599) | ||
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| ## Bug 修复 | ||
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| + TiDB | ||
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| - 修复 hash 列为 `ENUM` 类型时 index hash join 的结果可能出错的问题 [#27893](https://github.com/pingcap/tidb/issues/27893) | ||
| - 修复极少数情况下 batch client 复用空闲连接可能阻塞请求发送的问题 [#27678](https://github.com/pingcap/tidb/pull/27678) | ||
| - 修复了 `FLOAT64` 类型的溢出检查与 MySQL 不一致的问题 [#23897](https://github.com/pingcap/tidb/issues/23897) | ||
| - 修复 TiDB 把 `pd is timeout` 错误返回成 `unkonwn` 的问题 [#26147](https://github.com/pingcap/tidb/issues/26147) | ||
| - 修复了 `case when` 表达式的字符集和排序规则错误的问题 [#26662](https://github.com/pingcap/tidb/issues/26662) | ||
| - 修复 MPP 查询可能返回 `can not found column in Schema column` 错误的问题 [#28148](https://github.com/pingcap/tidb/pull/28148) | ||
| - 修复 TiFlash 宕机可能导致 TiDB Panic 的问题 [#28096](https://github.com/pingcap/tidb/issues/28096) | ||
| - 修复使用谓词 `enum like 'x%'` 可能导致错误结果的问题 [#27130](https://github.com/pingcap/tidb/issues/27130) | ||
| - 修复当使用 IndexLookupJoin 时公共表达式 (CTE) 死锁的问题 [#27410](https://github.com/pingcap/tidb/issues/27410) | ||
| - 修复死锁重试被错误记录到 `INFORMATION_SCHEMA.DEADLOCKS` 表的问题 [#27400](https://github.com/pingcap/tidb/issues/27400) | ||
| - 修复分区表上的 `TABLESAMPLE` 查询结果排序不生效的问题 [#27349](https://github.com/pingcap/tidb/issues/27349) | ||
| - 移除未使用的 `/debug/sub-optimal-plan` HTTP 接口相关逻辑 [#27265](https://github.com/pingcap/tidb/pull/27265) | ||
| - 修复 hash 分区表处理无符号数据时查询返回错误结果的问题 [#26569](https://github.com/pingcap/tidb/issues/26569) | ||
| - 修复当 `NO_UNSIGNED_SUBTRACTION` 被设置时创建分区出错的问题 [#26765](https://github.com/pingcap/tidb/issues/26765) | ||
| - 修复 `Apply` 转换为 Join 时缺失 `distinct` 的问题 [#26958](https://github.com/pingcap/tidb/issues/26958) | ||
| - 为处于恢复状态的 TiFlash 节点设置一段屏蔽时间，避免在此时间内阻塞查询 [#26897](https://github.com/pingcap/tidb/pull/26897) | ||
| - 修复 CTE 被引用多次时可能出现的 bug 的问题 [#26212](https://github.com/pingcap/tidb/issues/26212) | ||
| - 修复使用 MergeJoin 时可能造成 CTE 出现 bug 的问题 [#25474](https://github.com/pingcap/tidb/issues/25474) | ||
| - 修复当 Join 分区表和普通表时 `select for update` 不能正确上锁的问题 [#26251](https://github.com/pingcap/tidb/issues/26251) | ||
| - 修复当 Join 分区表和普通表时 `select for update` 语句结果报错的问题 [#26250](https://github.com/pingcap/tidb/issues/26250) | ||
| - 修复 `PointGet` 不能使用轻量清锁的问题 [#26562](https://github.com/pingcap/tidb/pull/26562) | ||
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| + TiKV | ||
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| - 修复当 TiKV 从 v3.x 升级至较高版本后出现 Panic 的问题 [#10902](https://github.com/tikv/tikv/issues/10902) | ||
| - 修复损坏的快照文件可能会造成磁盘空间无法回收的问题 [#10813](https://github.com/tikv/tikv/issues/10813) | ||
| - 当 slogger 线程过载且队列已满时，删除日志而不是阻塞线程 [#10841](https://github.com/tikv/tikv/issues/10841) | ||
| - 使 TiKV Coprocessor 慢日志只考虑处理请求所花费的时间 [#10841](https://github.com/tikv/tikv/issues/10841) | ||
| - 修复当处理 Coprocessor 请求时因超时而导致 Panic 的问题 [#10852](https://github.com/tikv/tikv/issues/10852) | ||
| - 修复 TiKV 在启用 Titan 并从 v5.0 以前的版本升级时出现 Panic 的问题 [#10842](https://github.com/tikv/tikv/pull/10842) | ||
| - 修复高版本的 TiKV 无法回滚到 v5.0.x 的问题 [#10842](https://github.com/tikv/tikv/pull/10842) | ||
| - 修复 TiKV 可能会在 RocksDB 读取文件之前删除文件的错误 [#10438](https://github.com/tikv/tikv/issues/10438) | ||
| - 修复遗留的悲观锁导致的解析失败的问题 [#26404](https://github.com/pingcap/tidb/issues/26404) | ||
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| + PD | ||
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| - 修复 PD 未能及时修复 Down Peer 副本的问题 [#4077](https://github.com/tikv/pd/issues/4077) | ||
| - 修复 `replication.max-replicas` 更新后默认的 Placement Rules 副本数量不变的问题 [#3886](https://github.com/tikv/pd/issues/3886) | ||
| - 修复 PD 在扩容 TiKV 时可能会 Panic 的问题 [#3868](https://github.com/tikv/pd/issues/3868) | ||
| - 修复当集群中存在 evict leader 调度器时，PD 热点调度无法工作的问题 [#3697](https://github.com/tikv/pd/issues/3697) | ||
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| + TiFlash | ||
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| - 修复无法建立 MPP 连接时出现异常结果的问题 | ||
| - 修复多盘部署时数据不一致的潜在问题 | ||
| - 修复高负载时出现 MPP 查询结果错误的问题 | ||
| - 修复 MPP 查询卡死的潜在问题 | ||
| - 修复并发执行节点初始化与 DDL 操作时出现异常的问题 | ||
| - 修复当查询过滤条件包含诸如 `CONSTANT`、`<`、`<=`、`>`、`>=` 或 `COLUMN` 时出现错误结果的问题 | ||
| - 修复并发执行多个 DDL 操作和 Apply Snapshot 操作时出现异常的潜在问题 | ||
| - 修复写入压力大时 metrics 中 store size 不准确的问题 | ||
| - 修复 TiFlash 长时间运行后无法回收 Delta 历史数据的潜在问题 | ||
| - 修复开启 New Collation 时查询结果错误的问题 | ||
| - 修复解锁出现异常的潜在问题 | ||
| - 修复 metrics 显示错误值的问题 | ||
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| + Tools | ||
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| + Backup & Restore (BR) | ||
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| - 修复了备份数据和恢复数据时显示的平均速度数值不准确的问题 [#1405](https://github.com/pingcap/br/issues/1405) | ||
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| + Dumpling | ||
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| - 修复特定 MySQL 版本（8.0.3，8.0.23）下，`show table status` 返回结果不正确导致 dump 阶段卡死的问题 [#333](https://github.com/pingcap/dumpling/pull/333) | ||
| - 修复 CLI 在默认 `sort-engine` 选项上与 4.0.x 集群的兼容性问题 [#2373](https://github.com/pingcap/ticdc/issues/2373) | ||
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| + TiCDC | ||
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| - 修复未充分考虑字符串类型的值可能是 `string` 或 `[]byte` 时，转换为 JSON 格式可能导致 TiCDC 进程崩溃的问题 [#2758](https://github.com/pingcap/ticdc/issues/2758) | ||
| - 降低 gRPC 的 window size 以避免出现 OOM 的情况 [#2202](https://github.com/pingcap/ticdc/issues/2202) | ||
| - 修复内存压力较高时 gRPC 的 `keepalive` 错误 [#2202](https://github.com/pingcap/ticdc/issues/2202) | ||
| - 修复 `unsigned tinyint` 导致 TiCDC 崩溃的问题 [#2648](https://github.com/pingcap/ticdc/issues/2648) | ||
| - 修复 TiCDC Open Protocol 下输出空值的问题。修复后，在开放协议下，未包含变更的事务 TiCDC 处理时不再输出空值 [#2612](https://github.com/pingcap/ticdc/issues/2612) | ||
| - 修复手动重启 TiCDC 时 DDL 处理存在的问题 [#2603](https://github.com/pingcap/ticdc/issues/2603) | ||
| - 修复操作元数据时，`EtcdWorker` 的快照隔离可能被破坏的问题 [#2559](https://github.com/pingcap/ticdc/pull/2559) | ||
| - 修复 TiCDC 在重新调度 table 时多个 processors 可能向同一个 table 写数据的问题 [#2230](https://github.com/pingcap/ticdc/issues/2230) | ||
| - 修复 TiCDC 遇到 `ErrSchemaStorageTableMiss` 错误时可能导致 changefeed 被意外重置的问题 [#2422](https://github.com/pingcap/ticdc/issues/2422) | ||
| - 修复 TiCDC 遇到 `ErrGCTTLExceeded` 错误时 changefeed 不能被移除的问题 [#2391](https://github.com/pingcap/ticdc/issues/2391) | ||
| - 修复 TiCDC 同步大表到 cdclog 失败的问题 [#1259](https://github.com/pingcap/ticdc/issues/1259)[#2424](https://github.com/pingcap/ticdc/issues/2424) |
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