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update enable-ttl description #8043

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merged 6 commits into from
Mar 7, 2022
Merged

update enable-ttl description #8043

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8a6c3cd
update enable-ttl description
7yyo Dec 22, 2021
3a5551c
update enable-ttl description
7yyo Dec 22, 2021
bedfd6f
Update tikv-configuration-file.md
hfxsd Dec 28, 2021
0545ed0
Update tikv-configuration-file.md
TomShawn Jan 28, 2022
095423a
Update tikv-configuration-file.md
7yyo Feb 21, 2022
c48dcda
fix a jenkins error
en-jin19 Mar 7, 2022
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7 changes: 6 additions & 1 deletion tikv-configuration-file.md
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Expand Up @@ -340,9 +340,14 @@ TiKV 配置文件比命令行参数支持更多的选项。你可以在 [etc/con
### `enable-ttl`

+ TTL 即 Time to live。数据超过 TTL 时间后会被自动删除。用户需在客户端写入请求中指定 TTL。不指定 TTL 即表明相应数据不会被自动删除。
+ 注意：TTL 暂时只适用于 RawKV 接口。由于所涉及底层数据格式的不同，用户只能在新建集群时设置好该功能，在已有集群上修改该项配置会使得启动报错。
+ 默认值：false

> **警告：**
>
> TTL 暂时只适用于 RawKV 接口。由于所涉及底层数据格式不同，你只能在新建集群时设置该功能。
> **禁止**在已有集群上修改该项配置，否则会导致启动报错。
> **禁止**在有 TiDB 节点的集群中使用该参数，以免导致数据写坏等严重后果。

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### `ttl-check-poll-interval`

+ 回收数据物理空间的检查周期。如果数据超过了 TTL 时间，数据的物理空间会在检查时被强制回收。
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