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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: TiDB 6.5.5 Release Notes | ||
| summary: Learn about the improvements and bug fixes in TiDB 6.5.5. | ||
| --- | ||
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| # TiDB 6.5.5 Release Notes | ||
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| Release date: September 21, 2023 | ||
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| TiDB version: 6.5.5 | ||
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| Quick access: [Quick start](https://docs.pingcap.com/tidb/v6.5/quick-start-with-tidb) | [Production deployment](https://docs.pingcap.com/tidb/v6.5/production-deployment-using-tiup) | [Installation packages](https://www.pingcap.com/download/?version=v6.5.5#version-list) | ||
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| ## Improvements | ||
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| + TiDB | ||
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| - Add new optimizer hints, including [`NO_MERGE_JOIN()`](https://docs.pingcap.com/tidb/v6.5/optimizer-hints#no_merge_joint1_name--tl_name-), [`NO_INDEX_JOIN()`](https://docs.pingcap.com/tidb/v6.5/optimizer-hints#no_index_joint1_name--tl_name-), [`NO_INDEX_MERGE_JOIN()`](https://docs.pingcap.com/tidb/v6.5/optimizer-hints#no_index_merge_joint1_name--tl_name-), [`NO_HASH_JOIN()`](https://docs.pingcap.com/tidb/v6.5/optimizer-hints#no_hash_joint1_name--tl_name-), and [`NO_INDEX_HASH_JOIN()`](https://docs.pingcap.com/tidb/v6.5/optimizer-hints#no_index_hash_joint1_name--tl_name-) [#45520](https://github.com/pingcap/tidb/issues/45520) @[qw4990](https://github.com/qw4990) | ||
| - Add request source information related to the coprocessor [#46514](https://github.com/pingcap/tidb/issues/46514) @[you06](https://github.com/you06) | ||
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| + TiKV | ||
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| - Add the backoff mechanism for the PD client in the process of connection retries, which gradually increases retry intervals during error retries to reduce PD pressure [#15428](https://github.com/tikv/tikv/issues/15428) @[nolouch](https://github.com/nolouch) | ||
| - Add monitoring metrics for snapshots [#15401](https://github.com/tikv/tikv/issues/15401) @[SpadeA-Tang](https://github.com/SpadeA-Tang) | ||
| - Improve stability of PITR checkpoint lag during leader transfers [#13638](https://github.com/tikv/tikv/issues/13638) @[YuJuncen](https://github.com/YuJuncen) | ||
| - Add logs and monitoring metrics related to `safe-ts` [#15082](https://github.com/tikv/tikv/issues/15082) @[ekexium](https://github.com/ekexium) | ||
| - Provide more logs and monitoring metrics for `resolved-ts` [#15082](https://github.com/tikv/tikv/issues/15082) @[ekexium](https://github.com/ekexium) | ||
| - Optimize the compaction mechanism: when a Region is split, if there is no key to split, a compaction is triggered to eliminate excessive MVCC versions [#15282](https://github.com/tikv/tikv/issues/15282) @[SpadeA-Tang](https://github.com/SpadeA-Tang) | ||
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| + Tools | ||
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| + Backup & Restore (BR) | ||
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| - Reduce the CPU overhead of log backup `resolve lock` [#40759](https://github.com/pingcap/tidb/issues/40759) @[3pointer](https://github.com/3pointer) | ||
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| ## Bug fixes | ||
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| + TiDB | ||
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| - Fix the issue that Stale Read might select an unavailable replica [#46198](https://github.com/pingcap/tidb/issues/46198) @[zyguan](https://github.com/zyguan) | ||
| - Fix the issue that additional overhead is incurred due to the incompatibility between Stale Read and Schema Cache [#43481](https://github.com/pingcap/tidb/issues/43481) @[crazycs520](https://github.com/crazycs520) | ||
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| + TiKV | ||
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| - Fix the issue that the peers of the corresponding Region mistakenly hibernate when a TiKV node fails [#14547](https://github.com/tikv/tikv/issues/14547) @[hicqu](https://github.com/hicqu) | ||
| - Fix the issue that TiKV fails to start when Titan is enabled and the `Blob file deleted twice` error occurs [#15454](https://github.com/tikv/tikv/issues/15454) @[Connor1996](https://github.com/Connor1996) | ||
| - Fix the issue that Online Unsafe Recovery cannot handle merge abort [#15580](https://github.com/tikv/tikv/issues/15580) @[v01dstar](https://github.com/v01dstar) | ||
| - Fix the issue that network interruption between PD and TiKV might cause PITR to get stuck [#15279](https://github.com/tikv/tikv/issues/15279) @[YuJuncen](https://github.com/YuJuncen) | ||
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| + PD | ||
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| - Fix the issue that the scheduler takes a long time to start up [#6920](https://github.com/tikv/pd/issues/6920) @[HuSharp](https://github.com/HuSharp) | ||
| - Fix the issue that the logic for handling Leaders and Peers in Scatter Region is inconsistent [#6962](https://github.com/tikv/pd/issues/6962) @[bufferflies](https://github.com/bufferflies) | ||
| - Fix the issue that the `empty-region-count` monitoring metric is abnormal when the cluster is restarted or the PD Leader is switched [#7008](https://github.com/tikv/pd/issues/7008) @[CabinfeverB](https://github.com/CabinfeverB) | ||
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| + Tools | ||
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| + Backup & Restore (BR) | ||
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| - Fix the issue that restoring implicit primary keys by PITR might lead to conflicts [#46520](https://github.com/pingcap/tidb/issues/46520) @[3pointer](https://github.com/3pointer) | ||
| - Fix the issue that an error occurs when PITR recovers the meta-kv [#46578](https://github.com/pingcap/tidb/issues/46578) @[Leavrth](https://github.com/Leavrth) | ||
| - Fix an error in BR integration test cases [#45561](https://github.com/pingcap/tidb/issues/46561) @[purelind](https://github.com/purelind) | ||
| - Alleviate the issue that the latency of the PITR log backup progress increases when Region leadership migration occurs [#13638](https://github.com/tikv/tikv/issues/13638) @[YuJuncen](https://github.com/YuJuncen) | ||
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| + TiCDC | ||
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| - Fix the issue of high TiCDC replication latency caused by network isolation of PD nodes [#9565](https://github.com/pingcap/tiflow/issues/9565) @[asddongmen](https://github.com/asddongmen) | ||
| - Fix the issue that TiCDC incorrectly changes the `UPDATE` operation to `INSERT` when using the CSV format [#9658](https://github.com/pingcap/tiflow/issues/9658) @[3AceShowHand](https://github.com/3AceShowHand) | ||
| - Fix the issue that user passwords are recorded in some logs [#9690](https://github.com/pingcap/tiflow/issues/9690) @[sdojjy](https://github.com/sdojjy) | ||
| - Fix the issue that using the SASL authentication might cause TiCDC to panic [#9669](https://github.com/pingcap/tiflow/issues/9669) @[sdojjy](https://github.com/sdojjy) | ||
| - Fix the issue that TiCDC replication tasks might fail in some corner cases [#9685](https://github.com/pingcap/tiflow/issues/9685) [#9697](https://github.com/pingcap/tiflow/issues/9697) [#9695](https://github.com/pingcap/tiflow/issues/9695) [#9736](https://github.com/pingcap/tiflow/issues/9736) @[hicqu](https://github.com/hicqu) @[CharlesCheung96](https://github.com/CharlesCheung96) | ||
| - Fix the issue that TiCDC cannot recover quickly from TiKV node failures when there are a lot of Regions upstream [#9741](https://github.com/pingcap/tiflow/issues/9741) @[sdojjy](https://github.com/sdojjy) | ||
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| + TiDB Lightning | ||
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| - Fix the issue that TiDB Lightning fails to start when TiCDC is deployed on the target server [#41040](https://github.com/pingcap/tidb/issues/41040) @[lance6716](https://github.com/lance6716) | ||
| - Fix the issue that TiDB Lightning fails to start when PD topology is changed [#46688](https://github.com/pingcap/tidb/issues/46688) @[lance6716](https://github.com/lance6716) | ||
| - Fix the issue that TiDB Lightning cannot continue importing data after PD switching Leaders [#46540](https://github.com/pingcap/tidb/issues/46540) @[lance6716](https://github.com/lance6716) | ||
| - Fix the issue that precheck cannot accurately detect the presence of a running TiCDC in the target cluster [#41040](https://github.com/pingcap/tidb/issues/41040) @[lance6716](https://github.com/lance6716) |
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