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releases: add 4.0.0 GA release notes (#2709)
* releases: add 4.0.0 GA release notes * fix ci * resolve error * format error * format * Update releases/release-4.0.0-ga.md Co-authored-by: Ran <huangran@pingcap.com> * Update releases/release-4.0.0-ga.md Co-authored-by: Ran <huangran@pingcap.com> * Update releases/release-4.0.0-ga.md Co-authored-by: Ran <huangran@pingcap.com> * Update releases/release-4.0.0-ga.md Co-authored-by: Ran <huangran@pingcap.com> * Update releases/release-4.0.0-ga.md Co-authored-by: Ran <huangran@pingcap.com> * Update releases/release-4.0.0-ga.md Co-authored-by: Ran <huangran@pingcap.com> * Update releases/release-4.0.0-ga.md Co-authored-by: Ran <huangran@pingcap.com> * address comments * update file name * Apply suggestions from code review * Apply suggestions from code review Co-authored-by: Ran <huangran@pingcap.com> Co-authored-by: Lilian Lee <lilin@pingcap.com>
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| --- | ||
| title: TiDB 4.0 GA Release Notes | ||
| category: Releases | ||
| --- | ||
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| # TiDB 4.0 GA Release Notes | ||
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| Release date: May 28, 2020 | ||
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| TiDB version: 4.0.0 | ||
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| ## Compatibility Changes | ||
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| * TiDB | ||
| - Optimize the error message of the large-sized transactions for easier troubleshooting [#17219](https://github.com/pingcap/tidb/pull/17219) | ||
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| * TiCDC | ||
| - Optimize the structure of the `Changefeed` configuration file to improve usability [#588](https://github.com/pingcap/ticdc/pull/588) | ||
| - Add the `ignore-txn-start-ts` configuration item, and change the condition from `commit_ts` to `start_ts` during transactions filtering [#589](https://github.com/pingcap/ticdc/pull/589) | ||
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| ## Important Bug Fixes | ||
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| * TiKV | ||
| - Fix the `DefaultNotFound` error that occurs when backing up using Backup & Restore (BR) [#7937](https://github.com/tikv/tikv/pull/7937) | ||
| - Fix system panics caused by the out-of-order `ReadIndex` packages [#7930](https://github.com/tikv/tikv/pull/7930) | ||
| - Fix system panics caused by incorrectly removing snapshot files after TiKV is restarted [#7927](https://github.com/tikv/tikv/pull/7927) | ||
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| * TiFlash | ||
| - Fix the possible data loss issue that occurs when the system panics because of incorrect processing logic of `Raft Admin Command` | ||
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| ## New Features | ||
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| * TiDB | ||
| - Add the `committer-concurrency` configuration item to control the number of `goroutines` in the retry-commit phase [#16849](https://github.com/pingcap/tidb/pull/16849) | ||
| - Support the `show table partition regions` syntax [#17294](https://github.com/pingcap/tidb/pull/17294) | ||
| - Add the `tmp-storage-quota` configuration item to limit the temporary disk space used by the TiDB server [#15700](https://github.com/pingcap/tidb/pull/15700) | ||
| - Support checking whether the partitioned table uses a unique prefix index when creating and changing tables [#17213](https://github.com/pingcap/tidb/pull/17213) | ||
| - Support the `insert/replace into tbl_name partition`(`partition_name_list`) statement [#17313](https://github.com/pingcap/tidb/pull/17313) | ||
| - Support checking the value of `collations` when using the `Distinct` function [#17240](https://github.com/pingcap/tidb/pull/17240) | ||
| - Support the `is null` filter condition during the Hash partition pruning [#17310](https://github.com/pingcap/tidb/pull/17310) | ||
| - Support `admin check index`, `admin cleanup index`, and `admin recover index` in partitioned tables [#17392](https://github.com/pingcap/tidb/pull/17392) [#17405](https://github.com/pingcap/tidb/pull/17405) [#17317](https://github.com/pingcap/tidb/pull/17317) | ||
| - Support range partition pruning for the `in` expressions [#17320](https://github.com/pingcap/tidb/pull/17320) | ||
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| * TiFlash | ||
| - Support filtering out the data corresponding to the qualified `TSO` through the `min commit ts` value of the `Lock CF` when the Learner reads the data | ||
| - Add the feature that the system explicitly reports an error to avoid incorrect calculation results when the value of `TIMESTAMP` type is less than `1970-01-01 00:00:00` | ||
| - Support using flags in regular expressions when searching logs | ||
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| * TiKV | ||
| - Support collation rules of `ascii_bin` and `latin1_bin` encoding [#7919](https://github.com/tikv/tikv/pull/7919) | ||
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| * PD | ||
| - Support specifying the reverse proxy resource prefix for built-in TiDB Dashboard [#2457](https://github.com/pingcap/pd/pull/2457) | ||
| - Support returning the `pending peer` and `down peer` information in interfaces of the PD client Region [#2443](https://github.com/pingcap/pd/pull/2443) | ||
| - Add monitoring items such as `Direction of hotspot move leader`, `Direction of hotspot move peer`, and `Hot cache read entry number` [#2448](https://github.com/pingcap/pd/pull/2448) | ||
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| * Tools | ||
| + Backup & Restore (BR) | ||
| - Support the backup and restore of `Sequence` and `View` [#242](https://github.com/pingcap/br/pull/242) | ||
| + TiCDC | ||
| - Support checking the validity of `Sink URI` when creating `Changefeed` [#561](https://github.com/pingcap/ticdc/pull/561) | ||
| - Support checking whether the PD and TiKV versions meet the system requirements during system startup [#570](https://github.com/pingcap/ticdc/pull/570) | ||
| - Support scheduling multiple tables in the same scheduling task generation cycle [#572](https://github.com/pingcap/ticdc/pull/572) | ||
| - Add information about node roles in HTTP API [#591](https://github.com/pingcap/ticdc/pull/591) | ||
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| ## Bug Fixes | ||
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| * TiDB | ||
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| - Fix the issue of unexpected timeouts when sending and receiving messages by disabling TiDB to send batch commands to TiFlash [#17307](https://github.com/pingcap/tidb/pull/17307) | ||
| - Fix the issue of incorrectly distinguishing signed and unsigned integers during partition pruning, which improves performance [#17230](https://github.com/pingcap/tidb/pull/17230) | ||
| - Fix the issue of upgrade failure from v3.1.1 to v4.0 because of the incompatible `mysql.user` table [#17300](https://github.com/pingcap/tidb/pull/17300) | ||
| - Fix the issue of incorrect selection of the partition in the `update` statement [#17305](https://github.com/pingcap/tidb/pull/17305) | ||
| - Fix system panics when receiving an unknown error message from TiKV [#17380](https://github.com/pingcap/tidb/pull/17380) | ||
| - Fix system panics caused by incorrect processing logic when creating the table that is `key` partitioned [#17242](https://github.com/pingcap/tidb/pull/17242) | ||
| - Fix the issue that the wrong `Index Merge Join` plan is selected because of incorrect optimizer processing logic [#17365](https://github.com/pingcap/tidb/pull/17365) | ||
| - Fix the issue of inaccurate `duration` monitoring metric of the `SELECT` statement in Grafana [#16561](https://github.com/pingcap/tidb/pull/16561) | ||
| - Fix the issue that the GC worker is blocked when the system error occurs [#16915](https://github.com/pingcap/tidb/pull/16915) | ||
| - Fix the issue that the `UNIQUE` constraint on a boolean column results in an incorrect result in a comparison [#17306](https://github.com/pingcap/tidb/pull/17306) | ||
| - Fix system panics caused by incorrect processing logic when `tidb_opt_agg_push_down` is enabled and the aggregation function pushes down the partitioned table [#17328](https://github.com/pingcap/tidb/pull/17328) | ||
| - Fix the issue of accessing failed TiKV nodes in some cases [#17342](https://github.com/pingcap/tidb/pull/17342) | ||
| - Fix the issue that the `isolation-read` configuration item in `tidb.toml` does not take effect [#17322](https://github.com/pingcap/tidb/pull/17322) | ||
| - Fix the issue of incorrect order of output results due to incorrect processing logic when `hint` is used to enforce the stream aggregation [#17347](https://github.com/pingcap/tidb/pull/17347) | ||
| - Fix the behavior that `insert` processes DIV under different `SQL_MODE` [#17314](https://github.com/pingcap/tidb/pull/17314) | ||
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| * TiFlash | ||
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| - Fix the issue that the matching behavior of regular expressions in the search log feature is inconsistent with other components | ||
| - Fix the issue of excessive restart time when nodes write large amounts of data by disabling the delay processing optimization of `Raft Compact Log Command` by default | ||
| - Fix the issue that the system fails to start because TiDB incorrectly processes the `DROP DATABASE` statement in some scenarios | ||
| - Fix the issue that the method of collecting CPU information in `Server_info` is different from that in other components | ||
| - Fix the issue that the error `Too Many Pings` is reported when the `Query` statement is executed if `batch coprocessor` is enabled | ||
| - Fix the issue that Dashboard fails to display the correct `deploy path` information because TiFlash does not report the related information | ||
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| * TiKV | ||
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| - Fix the `DefaultNotFound` error that occurs when backing up using BR [#7937](https://github.com/tikv/tikv/pull/7937) | ||
| - Fix system panics caused by out-of-order `ReadIndex` packets [#7930](https://github.com/tikv/tikv/pull/7930) | ||
| - Fix the issue that an unexpected error is returned because the read request callback function is not called [#7921](https://github.com/tikv/tikv/pull/7921) | ||
| - Fix system panics caused by incorrectly removing snapshot files when TiKV is restarted [#7927](https://github.com/tikv/tikv/pull/7927) | ||
| - Fix the issue that the `master key` cannot be rotated due to incorrect processing logic in storage encryption [#7898](https://github.com/tikv/tikv/pull/7898) | ||
| - Fix the issue that the received `lock cf` file of the snapshot is not encrypted when the storage encryption is enabled [#7922](https://github.com/tikv/tikv/pull/7922) | ||
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| * PD | ||
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| - Fix the 404 error when deleting `evict-leader-scheduler` or `grant-leader-scheduler` using pd-ctl [#2446](https://github.com/pingcap/pd/pull/2446) | ||
| - Fix the issue that the `presplit` feature might not work properly when the TiFlash replica exists [#2447](https://github.com/pingcap/pd/pull/2447) | ||
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| * Tools | ||
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| + BR | ||
| - Fix the issue that the data restoration fails due to network issues when BR restores data from cloud storage [#298](https://github.com/pingcap/br/pull/298) | ||
| + TiCDC | ||
| - Fix system panics caused by data race [#565](https://github.com/pingcap/ticdc/pull/565) [#566](https://github.com/pingcap/ticdc/pull/566) | ||
| - Fix resource leaks or system blockages caused by incorrect processing logic [#574](https://github.com/pingcap/ticdc/pull/574) [#586](https://github.com/pingcap/ticdc/pull/586) | ||
| - Fix the issue that the command line gets stuck because CLI cannot connect to PD [#579](https://github.com/pingcap/ticdc/pull/579) |
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