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add config unit for tidb_adaptive_closest_read_threshold #13697

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May 5, 2023
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add config unit for tidb_adaptive_closest_read_threshold #13697

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add config unit for tidb_adaptive_closest_read_threshold
glorv Apr 13, 2023
4a81586
Update system-variables.md
qiancai May 4, 2023
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2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -581,7 +581,7 @@ mysql> SHOW GLOBAL VARIABLES LIKE 'max_prepared_stmt_count';
- 作用域：SESSION | GLOBAL
- 是否持久化到集群：是
- 默认值：`4096`
- 取值范围：`[0, 9223372036854775807]`
- 取值范围：`[0, 9223372036854775807]`，单位为 Byte。
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- 这个变量用于控制当 [`replica-read`](#tidb_replica_read-从-v40-版本开始引入) 设置为 `closest-adaptive` 时，优先将读请求发送至 TiDB server 所在区域副本的阈值。当读请求预估的返回结果的大小超过此阈值时，TiDB 会将读请求优先发送至同一可用区的副本，否则会发送至 leader 副本。

### `tidb_allow_batch_cop` <span class="version-mark">从 v4.0 版本开始引入</span>
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