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Apr 14, 2025
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tiflash: upgrade guide #20128

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upgrade to 9.0
Mar 27, 2025
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Update tiflash-upgrade-guide.md
qiancai Apr 9, 2025
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Expand Up @@ -123,6 +123,10 @@ TiFlash 在 v6.2.0 将数据格式升级到 V3 版本，因此，从 v5.x 或 v6

从 v8.4 开始，为了支持[向量搜索功能](/vector-search/vector-search-index.md)，TiFlash 底层存储格式发生改动。因此，升级 TiFlash 到 v8.4 或以上版本后，不支持原地降级到之前的版本。

## 从 v8.x 升级至 v9.0 或以上版本

从 v9.0.0 开始，为了优化字符串数据的读写性能，TiFlash 针对字符串数据的存储格式进行了改动。因此，升级 TiFlash 到 v9.0.0 或以上版本后，不支持原地降级到之前的版本。

**测试环境及特殊回退需求下的对策**

如果在测试环境下或者其他有特殊回退需求的场景下，可以强制缩容 TiFlash 节点，并重新同步数据。操作步骤详见[缩容 TiFlash 节点](/scale-tidb-using-tiup.md#缩容-tiflash-节点)。