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Apr 17, 2020
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tiup: add description in tiup upgrade doc (#2808) #2809

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6 changes: 5 additions & 1 deletion how-to/upgrade/using-tiup.md
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Expand Up @@ -146,7 +146,11 @@ tiup update cluster
tiup cluster upgrade <cluster-name> v4.0.0-rc
```

滚动升级会逐个升级所有的组件。升级 TiKV 期间，会逐个将 TiKV 上的所有 leader 切走再停止该 TiKV 实例。默认超时时间为 10 分钟，超过后会直接停止实例。
滚动升级会逐个升级所有的组件。升级 TiKV 期间，会逐个将 TiKV 上的所有 leader 切走再停止该 TiKV 实例。默认超时时间为 5 分钟，超过后会直接停止实例。

如果不希望驱逐 leader，而希望立刻升级，可以在上述命令中指定 `--force`，该方式会造成性能抖动，不会造成数据损失。

如果希望保持性能稳定，则需要保证 TiKV 上的所有 leader 驱逐完成后再停止该 TiKV 实例，可以指定 `--transfer-timeout` 为一个超大值，如 `--transfer-timeout 100000000`，单位为 s。

### 4.2 升级后验证

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