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update v4.0.13 release notes at 2021-05-17T18:03:02
Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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| --- | ||
| title: tidb v4.0.13 Release Notes | ||
| category: Releases | ||
| aliases: ['/docs/dev/releases/v4.0.13/'] | ||
| --- | ||
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| # tidb v4.0.13 Release Notes | ||
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| Release date: May 17, 2021 | ||
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| TiDB version: v4.0.13 | ||
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| ## Bug Fixes | ||
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| + TiDB | ||
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| - Fix the case that there could be duplicate ranges for multi-column index. [#24634](https://github.com/pingcap/tidb/pull/24634) | ||
| - Fix wrong flen infer for bit constant [#24266](https://github.com/pingcap/tidb/pull/24266) | ||
| - Fix an issue that `NO_ZERO_IN_DATE` SQL mode does not work in default value [#24185](https://github.com/pingcap/tidb/pull/24185) | ||
| - Fix insert ignore on duplicate may delete wrong record [#23825](https://github.com/pingcap/tidb/pull/23825) | ||
| - Fix a bug that causes TiDB to report `TiKV server timeout` when executing TiFlash batch request. [#23700](https://github.com/pingcap/tidb/pull/23700) | ||
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| + TiFlash | ||
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| - Fix the bug that the number of storage delta-merge-tasks is not reported to Prometheus [#1838](https://github.com/pingcap/tics/pull/1838) | ||
| - Fix a bug that causes TiFlash crash during Segment Split. [#1814](https://github.com/pingcap/tics/pull/1814) | ||
| - Fix the bug that the Grafana panel `Region write Duration (write blocks)` may be shown in wrong place [#1804](https://github.com/pingcap/tics/pull/1804) | ||
| - Fix a potential issue that the DeleteRange in the storage engine failed to remove some data. [#1789](https://github.com/pingcap/tics/pull/1789) | ||
| - Fix problem that TiFlash coprocessor's cast time as int function may produce incorrect result. [#1785](https://github.com/pingcap/tics/pull/1785) | ||
| - Fix problem that behavior of TiFlash coprocessor's bitwise operator is different from TiDB [#1773](https://github.com/pingcap/tics/pull/1773) | ||
| - Fix the problem that TiFlash coprocessor's cast string as int function may produce incorrect result. [#1767](https://github.com/pingcap/tics/pull/1767) | ||
| - Fix the issue that continuous and fast writing may make TiFlash OOM [#1737](https://github.com/pingcap/tics/pull/1737) | ||
| - Fix the crash that causes by applying Raft commands to dropped tables [#1724](https://github.com/pingcap/tics/pull/1724) | ||
| - Fix potential NPE in schema sync service when database is dropped between GC and getting the database info. [#1707](https://github.com/pingcap/tics/pull/1707) | ||
| - Fix the issue that TiFlash may panic during br restore [#1697](https://github.com/pingcap/tics/pull/1697) | ||
| - Fix the bug that some characters have wrong weights when using general CI collation [#1667](https://github.com/pingcap/tics/pull/1667) | ||
| - Fix potential data loss when recovering a table that is previously dropped. [#1662](https://github.com/pingcap/tics/pull/1662) | ||
| - Fix a string compare bug that sometimes >= and <= will return wrong result if the contains with `\0` [#1658](https://github.com/pingcap/tics/pull/1658) | ||
| - Fix bug 1. logical function only accept numeric type as its input type, 2. logical function return wrong result if input column contains a null constant. [#1636](https://github.com/pingcap/tics/pull/1636) | ||
| - Fix wrong return value of timestamp column if the timestamp value is `1970-01-01` and the timezone offset is negative [#1601](https://github.com/pingcap/tics/pull/1601) | ||
| - Fix bug that Decimal256's hash value is not stable [#1597](https://github.com/pingcap/tics/pull/1597) | ||
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| ## Improvements | ||
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| + TiDB | ||
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| - Skip reading mysql.stats_histograms if cached stats is up-to-date [#24352](https://github.com/pingcap/tidb/pull/24352) | ||
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| + TiFlash | ||
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| - Automatically clean archive data to free up disk space [#1638](https://github.com/pingcap/tics/pull/1638) | ||
| - No release notes [#1625](https://github.com/pingcap/tics/pull/1625) | ||
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| ## Others | ||
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| + TiDB | ||
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| - Allow changing an `AUTO_INCREMENT` column to an `AUTO_RANDOM` one. [#24608](https://github.com/pingcap/tidb/pull/24608) | ||
| - SQL Views now consider the default roles associated with the SQL DEFINER correctrly. [#24531](https://github.com/pingcap/tidb/pull/24531) | ||
| - Ddl: fix the covert job to rollingback job [#24445](https://github.com/pingcap/tidb/pull/24445) | ||
| - Fix wrong collation for concat function [#24300](https://github.com/pingcap/tidb/pull/24300) | ||
| - Fix a bug that point get plan returns wrong column name [#23970](https://github.com/pingcap/tidb/pull/23970) | ||
| - Fix resource leak of Shuffle Executor. [#23888](https://github.com/pingcap/tidb/pull/23888) | ||
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| + TiKV | ||
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| - Support back pressure CDC scan speed. [#10145](https://github.com/tikv/tikv/pull/10145) | ||
| - Fix interference between connections to the same region. [#10144](https://github.com/tikv/tikv/pull/10144) | ||
| - Cdc: skip seek old value for Put if cache returns None [#10141](https://github.com/tikv/tikv/pull/10141) | ||
| - Reduce memory usage of CDC initial scan. [#10134](https://github.com/tikv/tikv/pull/10134) | ||
| - Fix potential panics when input of cast_string_as_time is invalid UTF-8 bytes [#9994](https://github.com/tikv/tikv/pull/9994) | ||
| - Cdc: limit scan speed (128MB/s by default) [#9983](https://github.com/tikv/tikv/pull/9983) | ||
| - Fix the bug that TiKV cannot startup when the end of file dict file is damaged. [#9963](https://github.com/tikv/tikv/pull/9963) | ||
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| + PD | ||
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| - Metrics: let tso processing time not include consumption on the network [#3524](https://github.com/pingcap/pd/pull/3524) | ||
| - Dashboard: update to v2021.03.12.1 [#3469](https://github.com/pingcap/pd/pull/3469) | ||
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| + Tools | ||
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| - BR | ||
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| * BR would check cluster version of backup now. [#1090](https://github.com/pingcap/br/pull/1090) | ||
| * BR now support backing up user tables created in the `mysql` schema. [#1077](https://github.com/pingcap/br/pull/1077) | ||
| * BR now can tolerate minor TiKV disconnection. [#1062](https://github.com/pingcap/br/pull/1062) | ||
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| - TiCDC | ||
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| * Fix bug in flow control [#1779](https://github.com/pingcap/ticdc/pull/1779) | ||
| * Modified the update strategy of gcSafePoint. Fix the problem that TiKV GC safe point is blocked indefinitely due to TiCDC changefeed checkpoint stagnation. [#1756](https://github.com/pingcap/ticdc/pull/1756) | ||
| * Implement processor flow control to avoid OOM. [#1751](https://github.com/pingcap/ticdc/pull/1751) | ||
| * Revert the update for explicit_defaults_for_timestamp which requires `SUPER` privilege when replicating to MySQL. [#1749](https://github.com/pingcap/ticdc/pull/1749) | ||
| * Add stale temporary files clean-up in Unified Sorter, and forbids sharing sort-dir. [#1741](https://github.com/pingcap/ticdc/pull/1741) | ||
| * Aadd http handler for failpoint [#1732](https://github.com/pingcap/ticdc/pull/1732) |