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lilin90 committed Sep 24, 2024
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Expand Up @@ -177,7 +177,7 @@ TiDB 版本:8.4.0
* 系统变量 `tidb_scatter_region` 支持设置集群级别的 Region 打散策略 [#55184](https://github.com/pingcap/tidb/issues/55184) @[D3Hunter](https://github.com/D3Hunter) **tw@hfxsd** <!--1927-->

系统变量 `tidb_scatter_region` 在之前的版本仅支持设置为开启或者关闭,开启后,建表时会使用表级别打散策略。在批量快速建表,且表的数量达到几十万张后,该策略会导致 Region 集中分布在其中几个 TiKV 节点,导致这些 TiKV 节点 OOM。

为解决上述问题,从 v8.4.0 版本开始,将该系统变量改为字符串类型,且新增支持集群级别的打散策略,避免上述场景下导致 TiKV OOM 的问题。

更多信息,请参考[用户文档](/system-variables.md#tidb_scatter_region)
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