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Update pd-configuration-file.md
Co-authored-by: Grace Cai <qqzczy@126.com>
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pd-configuration-file.md

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@@ -290,7 +290,7 @@ pd-server 相关配置项。
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### `max-affinity-merge-region-size` <span class="version-mark">从 v8.5.5 和 v9.0.0 版本开始引入</span>
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+ 当 Region 属于亲和性分组且大小小于该值时,PD 会尝试将其与相邻的同一亲和性分组的 Region 合并。设置为 `0` 表示关闭配置了亲和性的 Region 合并
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- 控制属于同一[亲和性](table-affinity.md)分组中相邻的小 Region 自动合并的阈值。当 Region 属于某个亲和性分组,且其大小小于该配置值时,PD 会尝试将该 Region 与同一亲和性分组中相邻的其它小 Region 进行合并,以减少 Region 数量并维持亲和性效果。设置为 `0` 表示关闭亲和性分组中相邻小 Region 的自动合并
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+ 默认:256
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+ 单位:MiB
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