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releases: add TiDB 7.1.0 release notes (stable version) #13484

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releases: add TiDB 7.1.0 release notes (stable version)
Oreoxmt May 9, 2023
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Merge branch 'master' into v7.1.0-release-notes
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Update release-7.1.0.md
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hfxsd committed May 10, 2023
commit 8afa42993b4362361344c73ccecb6ff31fcc4111
14 changes: 4 additions & 10 deletions releases/release-7.1.0.md
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Expand Up @@ -136,24 +136,18 @@ In v7.1.0-LTS, the key new features and improvements are as follows:

* Optimize the strategy of loading statistics [#42160](https://github.com/pingcap/tidb/issues/42160) @[xuyifangreeneyes](https://github.com/xuyifangreeneyes)

Enabling synchronous loading of statistics can significantly reduce the number of statistics that must be loaded during startup, thus improving the speed of loading statistics. This feature increases the stability of TiDB in complex runtime environments and reduces the impact of individual TiDB nodes restart on the overall service.
Enabling synchronous loading of statistics can significantly reduce the number of statistics that must be loaded during startup, thus improving the speed of loading statistics. This feature increases the stability of TiDB in complex runtime environments and reduces the impact of individual TiDB nodes restart on the overall service. You can set the parameter [`lite-init-stats`](/tidb-configuration-file.md#lite-init-stats-new-in-v710) to `true` to enable this feature. Note that this parameter is experimental.

For more information, see [documentation](/statistics.md#load-statistics).
TiDB v7.1.0 also introduces the configuration parameter [`force-init-stats`](/tidb-configuration-file.md#force-init-stats-new-in-v710). This parameter forces TiDB to provide service to the public after the statistics is loaded, avoiding SQL performance issues caused by unloaded statistics during the startup phase. This configuration is disabled by default.
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For more information, see [documentation](/tidb-configuration-file.md).

* TiCDC supports the data integrity validation feature for single-row data [#8718](https://github.com/pingcap/tiflow/issues/8718) [#42747](https://github.com/pingcap/tidb/issues/42747) @[3AceShowHand](https://github.com/3AceShowHand) @[zyguan](https://github.com/zyguan) **tw:Oreoxmt**

Starting from v7.1.0, TiCDC introduces the data integrity validation feature, which uses a checksum algorithm to validate the integrity of single-row data. This feature helps verify whether any error occurs in the process of writing data from TiDB, replicating it through TiCDC, and then writing it to a Kafka cluster. The data integrity validation feature only supports changefeeds that use Kafka as the downstream and currently supports the Avro protocol.

For more information, see [documentation](/ticdc/ticdc-integrity-check.md).

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* Optimize the policy for loading statistics [#42160](https://github.com/pingcap/tidb/issues/42160) @[xuyifangreeneyes](https://github.com/xuyifangreeneyes) **tw:hfxsd**

After you enable the lightweight statistics initialization feature, TiDB can significantly reduce the number of statistics that must be loaded during startup, thus speeding up the loading of statistics during startup. This feature improves the stability of TiDB in complex operating environments, and reduces the impact on the overall service when some TiDB nodes are restarted. You can set the parameter [`lite-init-stats`](/tidb-configuration-file.md#lite-init-stats-new-in-v710) to `true` to enable this feature. Note that this parameter is experimental.

TiDB v7.1.0 also introduces the configuration parameter [`force-init-stats`](/tidb-configuration-file.md#force-init-stats-new-in-v710). This parameter forces TiDB to provide service to the public after the statistics is loaded, avoiding SQL performance issues caused by unloaded statistics during the startup phase. This configuration is disabled by default.

For more information, see [documentation](/tidb-configuration-file.md).

* TiCDC optimizes DDL replication operations [#8686](https://github.com/pingcap/tiflow/issues/8686) @[nongfushanquan](https://github.com/nongfushanquan) **tw:ran-huang**

Before v7.1.0, when you perform a DDL operation that affects all rows on a large table (such as adding or deleting a column), the replication latency of TiCDC would significantly increase. Starting from v7.1.0, TiCDC optimizes this replication operation and mitigates the impact of DDL operations on downstream latency.
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