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Add example about how to fill the <cluster_version> #12081

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Nov 22, 2022
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Add example about how to fill the <cluster_version> #12081

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14 changes: 10 additions & 4 deletions tiflash/create-tiflash-replicas.md
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Expand Up @@ -150,23 +150,29 @@ SELECT TABLE_NAME FROM information_schema.tables where TABLE_SCHEMA = "<db_name>
TiFlash 默认新增副本速度是 30（每分钟大约 30 个 Region 将会新增 TiFlash 副本）。执行以下命令将调整所有 TiFlash 实例的新增副本速度到 60，即原来的 2 倍速度：

```shell
tiup ctl:<cluster-version> pd -u http://<PD_ADDRESS>:2379 store limit all engine tiflash 60 add-peer
tiup ctl:v<CLUSTER_VERSION> pd -u http://<PD_ADDRESS>:2379 store limit all engine tiflash 60 add-peer
```

> 上述命令中，需要将 `<CLUSTER_VERSION>` 替换为该集群版本，`<PD_ADDRESS>:2379` 替换为任一 PD 节点的地址。替换后样例为：
>
> ```shell
> tiup ctl:v6.1.1 pd -u http://192.168.1.4:2379 store limit all engine tiflash 60 add-peer
> ```

执行完毕后，几分钟内，你将观察到 TiFlash 节点的 CPU 及磁盘 IO 资源占用显著提升，TiFlash 将更快地创建副本。同时，TiKV 节点的 CPU 及磁盘 IO 资源占用也将有所上升。

如果此时 TiKV 及 TiFlash 节点的资源仍有富余，且线上业务的延迟没有显著上升，则可以考虑进一步放开调度速度，例如将新增副本的速度增加为原来的 3 倍：

```shell
tiup ctl:<cluster-version> pd -u http://<PD_ADDRESS>:2379 store limit all engine tiflash 90 add-peer
tiup ctl:v<CLUSTER_VERSION> pd -u http://<PD_ADDRESS>:2379 store limit all engine tiflash 90 add-peer
```

3. 在副本同步完毕后，恢复到默认配置，减少在线业务受到的影响。

执行以下 PD Control 命令可恢复默认的新增副本速度：

```shell
tiup ctl:<cluster-version> pd -u http://<PD_ADDRESS>:2379 store limit all engine tiflash 30 add-peer
tiup ctl:v<CLUSTER_VERSION> pd -u http://<PD_ADDRESS>:2379 store limit all engine tiflash 30 add-peer
```

执行以下 SQL 语句可恢复默认的数据快照写入速度：
Expand Down Expand Up @@ -225,7 +231,7 @@ SELECT TABLE_NAME FROM information_schema.tables where TABLE_SCHEMA = "<db_name>
3. 此时 PD 会根据设置的 label 进行调度，将表 `t` 的两个副本分别调度到两个可用区中。可以通过监控或 pd-ctl 来验证这一点：

```shell
> tiup ctl:<version> pd -u<pd-host>:<pd-port> store
> tiup ctl:v<CLUSTER_VERSION> pd -u http://<PD_ADDRESS>:2379 store

...

Expand Down