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Update release-7.1.2.md (#15764) #15766

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Dec 18, 2023
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Update release-7.1.2.md (#15764) #15766

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Expand Up @@ -13,6 +13,8 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v7.1/quick-start-with-

## Compatibility changes

- Prohibit setting [`require_secure_transport`](https://docs.pingcap.com/tidb/v7.1/system-variables#require_secure_transport-new-in-v610) to `ON` in Security Enhanced Mode (SEM) to prevent potential connectivity issues for users [#47665](https://github.com/pingcap/tidb/issues/47665) @[tiancaiamao](https://github.com/tiancaiamao)
- Disable the [smooth upgrade](/smooth-upgrade-tidb.md) feature by default. You can enable it by sending the `/upgrade/start` and `upgrade/finish` HTTP requests [#47172](https://github.com/pingcap/tidb/issues/47172) @[zimulala](https://github.com/zimulala)
- Introduce the [`tidb_opt_enable_hash_join`](https://docs.pingcap.com/tidb/v7.1/system-variables#tidb_opt_enable_hash_join-new-in-v712) system variable to control whether the optimizer selects hash joins for tables [#46695](https://github.com/pingcap/tidb/issues/46695) @[coderplay](https://github.com/coderplay)
- Disable periodic compaction of RocksDB by default, so that the default behavior of TiKV RocksDB is now consistent with that in versions before v6.5.0. This change prevents potential performance impact caused by a significant number of compactions after upgrading. In addition, TiKV introduces two new configuration items [`rocksdb.[defaultcf|writecf|lockcf].periodic-compaction-seconds`](https://docs.pingcap.com/tidb/v7.1/tikv-configuration-file#periodic-compaction-seconds-new-in-v712) and [`rocksdb.[defaultcf|writecf|lockcf].ttl`](https://docs.pingcap.com/tidb/v7.1/tikv-configuration-file#ttl-new-in-v712), enabling you to manually configure periodic compaction of RocksDB [#15355](https://github.com/tikv/tikv/issues/15355) @[LykxSassinator](https://github.com/LykxSassinator)
- TiCDC introduces the [`sink.csv.binary-encoding-method`](/ticdc/ticdc-changefeed-config.md#changefeed-configuration-parameters) configuration item to control the encoding method of binary data in the CSV protocol. The default value is `'base64'` [#9373](https://github.com/pingcap/tiflow/issues/9373) @[CharlesCheung96](https://github.com/CharlesCheung96)
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