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tidb: mark tidb_mpp_store_fail_ttl as deprecated #20668

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tidb: mark tidb_mpp_store_fail_ttl as deprecated #20668

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6 changes: 5 additions & 1 deletion system-variables.md
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Expand Up @@ -3493,11 +3493,15 @@ v5.0 后，用户仍可以单独修改以上系统变量（会有废弃警告）

### `tidb_mpp_store_fail_ttl`

> **警告：**
>
> 从 v9.0.0 开始，该变量被废弃，其值将固定为 `0s`，意味着 TiDB 不再需要额外等待即可向新启动的 TiFlash 节点发送查询请求，无需再通过延迟来避免查询失败。

- 作用域：SESSION | GLOBAL
- 是否持久化到集群：是
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 类型：Duration
- 默认值：`60s`
- 默认值：在 v9.0.0 之前版本中为 `60s`，在 v9.0.0 及之后的版本中为 `0s`
- 刚重启的 TiFlash 可能不能正常提供服务。为了防止查询失败，TiDB 会限制 tidb-server 向刚重启的 TiFlash 节点发送查询。这个变量表示刚重启的 TiFlash 不被发送请求的时间范围。

### `tidb_multi_statement_mode` <span class="version-mark">从 v4.0.11 版本开始引入</span>
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