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releases: add tidb 4.0.15 release notes #6475

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Sep 27, 2021
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releases: add tidb 4.0.15 release notes #6475

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merge from upstream master
ti-srebot Jul 31, 2021
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merge from upstream master
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merge from upstream master
ti-srebot Sep 14, 2021
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releases: add TiDB 4.0.15-19-16-44 release notes
ti-srebot Sep 14, 2021
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add toc
TomShawn Sep 15, 2021
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TomShawn Sep 22, 2021
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Update release-4.0.15.md
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Update release-4.0.15.md
qiancai Sep 24, 2021
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TomShawn Sep 24, 2021
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Update releases/release-4.0.15.md
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Update releases/release-4.0.15.md
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@TomShawn
TomShawn committed Sep 24, 2021
commit 6f94b4738250134a2ae6ce6c170c50517745b161
24 changes: 12 additions & 12 deletions releases/release-4.0.15.md
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Expand Up @@ -12,7 +12,7 @@ TiDB version: 4.0.15

+ TiDB

- Fix the issue that executing `SHOW VARIABLES` in a new session is slow. This fix reverts some changes made in [#18517](https://github.com/pingcap/tidb/issues/18517) and might cause compatibility issues. [#18517](https://github.com/pingcap/tidb/issues/18517)
- Fix the issue that executing `SHOW VARIABLES` in a new session is slow. This fix reverts some changes made in [#21045](https://github.com/pingcap/tidb/pull/21045) and might cause compatibility issues. [#24326](https://github.com/pingcap/tidb/issues/24326)

## Feature enhancement

Expand Down Expand Up @@ -41,15 +41,15 @@ TiDB version: 4.0.15

+ Backup & Restore (BR)

- Split and scatter Regions concurrently to improve restore speed [#1429](https://github.com/pingcap/br/pull/1429)
- Retry BR tasks when encountering the PD request error or the TiKV I/O timeout error [#1433](https://github.com/pingcap/br/pull/1433)
- Reduce empty Regions when restoring many small tables to avoid affecting cluster operation after the restore [#1374](https://github.com/pingcap/br/issues/1374) [#1432](https://github.com/pingcap/br/pull/1432)
- Split and scatter Regions concurrently to improve restore speed [#1363](https://github.com/pingcap/br/pull/1363)
- Retry BR tasks when encountering the PD request error or the TiKV I/O timeout error [#27787](https://github.com/pingcap/tidb/issues/27787)
- Reduce empty Regions when restoring many small tables to avoid affecting cluster operation after the restore [#1374](https://github.com/pingcap/br/issues/1374)
- Perform the `rebase auto id` operation while creating tables, which saves the separate `rebase auto id` DDL operations to speed up restore [#1424](https://github.com/pingcap/br/pull/1424)

+ Dumpling

- Filter the skipped databases before getting the table information to improve the filtering efficiency of `SHOW TABLE STATUS` [#337](https://github.com/pingcap/dumpling/pull/337)
- Use `SHOW FULL TABLES` to get table information for tables to be exported, because `SHOW TABLE STATUS` cannot work properly in some MySQL versions [#332](https://github.com/pingcap/dumpling/pull/332)
- Use `SHOW FULL TABLES` to get table information for tables to be exported, because `SHOW TABLE STATUS` cannot work properly in some MySQL versions [#322](https://github.com/pingcap/dumpling/issues/322)
- Support backing up MySQL-compatible databases that do not support the `START TRANSACTION ... WITH CONSISTENT SNAPSHOT` or the `SHOW CREATE TABLE` syntax [#309](https://github.com/pingcap/dumpling/issues/309)
- Refine the Dumpling warning log to avoid the misleading information that a dump fails [#340](https://github.com/pingcap/dumpling/pull/340)

Expand All @@ -59,14 +59,14 @@ TiDB version: 4.0.15

+ TiCDC

- TiCDC always pulls old values from TiKV internally [#2304](https://github.com/pingcap/ticdc/pull/2304)
- TiCDC always pulls old values from TiKV internally [#2397](https://github.com/pingcap/ticdc/pull/2397)
- Reduce the goroutine usage when a table's Regions are all transferred away from a TiKV node [#2284](https://github.com/pingcap/ticdc/issues/2284)
- Optimize workerpool for fewer goroutines when concurrency is high [#2211](https://github.com/pingcap/ticdc/issues/2211)
- Execute DDL statements asynchronously to avoid affecting other changefeeds [#2471](https://github.com/pingcap/ticdc/pull/2471)
- Execute DDL statements asynchronously to avoid affecting other changefeeds [#2295](https://github.com/pingcap/ticdc/issues/2295)
- Add a global gRPC connection pool and share gRPC connections among KV clients [#2531](https://github.com/pingcap/ticdc/pull/2531)
- Fail fast for unrecoverable DML errors [2315](https://github.com/pingcap/ticdc/pull/2315)
- Fail fast for unrecoverable DML errors [#1724](https://github.com/pingcap/ticdc/issues/1724)
- Optimize memory management when unified sorter is using memory to sort [#2553](https://github.com/pingcap/ticdc/issues/2553)
- Add Prometheus metrics for DDL executions [#2681](https://github.com/pingcap/ticdc/pull/2681)
- Add Prometheus metrics for DDL executions [#2595](https://github.com/pingcap/ticdc/issues/2595) [#2669](https://github.com/pingcap/ticdc/issues/2669)
- Prohibit operating TiCDC clusters across major or minor versions [#2601](https://github.com/pingcap/ticdc/pull/2601)
- Remove `file sorter` [#2325](https://github.com/pingcap/ticdc/pull/2325)
- Clean up changefeed metrics when a changefeed is removed, and clean up processor metrics when a processor exits [#2156](https://github.com/pingcap/ticdc/issues/2156)
Expand All @@ -79,7 +79,7 @@ TiDB version: 4.0.15
- Fix a bug that collation is incorrectly set for binary literals when building range [26455](https://github.com/pingcap/tidb/pull/26455)
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- Fix the issue of wrong character set and collation for the `case when` expression [#26662](https://github.com/pingcap/tidb/issues/26662)
- Fix the "index out of range" error that occurs when a query includes both `GROUP BY` and `UNION` [26553](https://github.com/pingcap/tidb/pull/26553)
- Fix the issue that TiDB might fail to send requests if TiKV has tombstone stores [#25849](https://github.com/pingcap/tidb/pull/25849)
- Fix the issue that TiDB might fail to send requests if TiKV has tombstone stores [#23676](https://github.com/pingcap/tidb/issues/23676) [#24648](https://github.com/pingcap/tidb/issues/24648)
- Fix the issue of unexpected behavior when casting the invalid string to `DATE` [#26762](https://github.com/pingcap/tidb/issues/26762)
- Fix the issue that column information is missed when converting the `Apply` operator to `Join` [#27233](https://github.com/pingcap/tidb/issues/27233)
- Fix a bug that the `count distinct` result on multiple columns is wrong when the new collation is enabled [#27091](https://github.com/pingcap/tidb/issues/27091)
Expand Down Expand Up @@ -125,11 +125,11 @@ TiDB version: 4.0.15
- Fix the deadlock issue in the TiCDC processor [#2017](https://github.com/pingcap/ticdc/pull/2017)
- Fix a data inconsistency issue that occurs because multiple processors might write data to the same table when this table is being re-scheduled [#2495](https://github.com/pingcap/ticdc/pull/2495)[#2727](https://github.com/pingcap/ticdc/pull/2727)
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- Fix a bug that the `EtcdWorker` snapshot isolation is violated in metadata management [#2557](https://github.com/pingcap/ticdc/pull/2557)
- Fix the issue that the changefeed cannot be stopped due to the DDL sink error [#2556](https://github.com/pingcap/ticdc/pull/2556)
- Fix the issue that the changefeed cannot be stopped due to the DDL sink error [#2552](https://github.com/pingcap/ticdc/issues/2552)
- Fix the issue of TiCDC Open Protocol: TiCDC outputs an empty value when there is no change in a transaction [#2612](https://github.com/pingcap/ticdc/issues/2612)
- Fix a bug that causes TiCDC to panic on the unsigned `TINYINT` type [#2648](https://github.com/pingcap/ticdc/issues/2648)
- Decrease the gRPC window size to avoid the OOM that occurs when TiCDC captures too many Regions [#2202](https://github.com/pingcap/ticdc/issues/2202)
- Fix the OOM issue that occurs when TiCDC captures too many Regions [#2723](https://github.com/pingcap/ticdc/pull/2723)
- Fix the OOM issue that occurs when TiCDC captures too many Regions [#2673](https://github.com/pingcap/ticdc/issues/2673)
- Fix the issue of process panic that occurs when encoding the data types such as `mysql.TypeString, mysql.TypeVarString, mysql.TypeVarchar` into JSON [#2758](https://github.com/pingcap/ticdc/issues/2758)
- Fix the a memory leak issue that might occur when creating a new changefeed [#2389](https://github.com/pingcap/ticdc/issues/2389)
- Fix a bug that DDL handling fails when a changefeed starts at the finish TS of a schema change [#2603](https://github.com/pingcap/ticdc/issues/2603)
Expand Down