releases: add tidb 5.0.2 release notes #5739
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releases/release-5.0.2.md
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| - Backup & Restore (BR) | ||
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| - Fix the bug that batch split region fails due to total key size exceeds raft entry limit [#1148](https://github.com/pingcap/br/pull/1148) |
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| - Backup & Restore (BR) | |
| - Fix the bug that batch split region fails due to total key size exceeds raft entry limit [#1148](https://github.com/pingcap/br/pull/1148) | |
| # TiCDC | |
| ## Compatibility Changes | |
| - `--sort-dir` in changefeed command is deprecated, please set `--sort-dir` in server command instead. [#1795](https://github.com/pingcap/ticdc/pull/1795) | |
| ## Improvements | |
| - Add metrics for table memory consumption [#1885](https://github.com/pingcap/ticdc/pull/1885) | |
| - Reduce memory malloc in sort heap to avoid too much CPU overhead. [#1863](https://github.com/pingcap/ticdc/pull/1863) | |
| - Modified the update strategy of gcSafePoint. Fix the problem that TiKV GC safe point is blocked indefinitely due to TiCDC changefeed checkpoint stagnation. [#1759](https://github.com/pingcap/ticdc/pull/1759) | |
| - Deleted useless log info that may cause confusion for users. [#1759](https://github.com/pingcap/ticdc/pull/1759) | |
| ## Bug Fixes | |
| - Fix time zone lost in Avro output. [#1712](https://github.com/pingcap/ticdc/pull/1712) | |
| - Add stale temporary files clean-up in Unified Sorter, and forbids sharing sort-dir. [#1742](https://github.com/pingcap/ticdc/pull/1742) | |
| - Fix a deadlock bug in the kv client that deadlock happens when large stale regions exist. [#1801](https://github.com/pingcap/ticdc/pull/1801) | |
| - Fix wrong usage in cdc server cli flag, `--cert-allowed-cn` [#1697](https://github.com/pingcap/ticdc/pull/1697) | |
| - Revert the update for explicit_defaults_for_timestamp which requires `SUPER` privilege when replicating to MySQL. [#1750](https://github.com/pingcap/ticdc/pull/1750) | |
| - Support sink flow control to reduce OOM [#1840](https://github.com/pingcap/ticdc/pull/1840) | |
| - Fix a bug about resolved ts stopped when move a table. [#1828](https://github.com/pingcap/ticdc/pull/1828) | |
| # TiDB-binlog | |
| None | |
| # BR | |
| ## Improvements | |
| - Clarify some ambiguous error message. [#1132](https://github.com/pingcap/br/pull/1132) | |
| - Checks cluster version of a backup. [#1091](https://github.com/pingcap/br/pull/1091) | |
| - Support backup and restore system tables in the `mysql` database.[#1143](https://github.com/pingcap/br/pull/1143) [#1078](https://github.com/pingcap/br/pull/1078) | |
| ## Bug Fixes | |
| - Fix the issue that log restore lost delete key during restore. [#1083](https://github.com/pingcap/br/pull/1083) | |
| - Fix a bug that caused BR send too many useless RPCs to TiKV [#1037](https://github.com/pingcap/br/pull/1037) | |
| - Fix a bug that caused, when backup failed, nothing would be printed to terminal. [#1043](https://github.com/pingcap/br/pull/1043) | |
| # Dumpling | |
| ## Improvements | |
| - Fix a bug that caused, when backup failed, nothing would be printed to terminal. [#280](https://github.com/pingcap/dumpling/pull/280) | |
| # TiDB-Lightning | |
| ## Bug Fixes | |
| - Fix the issue that lightning panic due to batch kv greater than 4 GB. [#5739](https://github.com/pingcap/br/pull/5739) | |
| - Fix the bug that lightning tidb backend cannot load any data when autocommit is disabled. [#1125](https://github.com/pingcap/br/pull/1125) | |
| - Fix the bug that batch split region fails due to total key size exceeds raft entry limit [#1065](https://github.com/pingcap/br/pull/1065) |
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Co-authored-by: JaySon <jayson.hjs@gmail.com>
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In response to a cherrypick label: new pull request created: #5766. |
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add tidb 5.0.2 release notes
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