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remove duplicate note in garbage-collection-configuration.md (#3807) #3849

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Jul 1, 2020
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remove duplicate note in garbage-collection-configuration.md (#3807) #3849

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6 changes: 2 additions & 4 deletions garbage-collection-configuration.md
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Expand Up @@ -94,18 +94,16 @@ update mysql.tidb set VARIABLE_VALUE="24h" where VARIABLE_NAME="tikv_gc_life_tim

## `tikv_gc_scan_lock_mode`

> **注意：**
> **警告：**
>
> 该功能目前为实验特性，不建议在生产环境中使用。
> Green GC 目前为实验特性，不建议在生产环境中使用。

设定 GC 的 Resolve Locks 阶段中，扫描锁的方式，即是否开启 Green GC（实验性特性）。Resolve Locks 阶段需要扫描整个集群的锁。在不开启 Green GC 的情况下，TiDB 会以 Region 为单位进行扫描。Green GC 提供了“物理扫描”的功能，即每台 TiKV 节点分别绕过 Raft 层直接扫描数据。该功能可以有效缓解 [Hibernate Region](/tikv-configuration-file.md#raftstorehibernate-regions-实验特性) 功能开启时，GC 唤醒全部 Region 的现象，并一定程度上提升 Resolve Locks 阶段的执行速度。

- `"legacy"`（默认）：使用旧的扫描方式，即关闭 Green GC。
- `"physical"`：使用物理扫描的方式，即开启 Green GC。

> **注意：**
>
> Green GC 目前是实验性功能，不建议在生产环境中使用。
>
> 该项配置是隐藏配置。首次开启需要执行：
>
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