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Apr 24, 2020
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tiup: add description in tiup upgrade doc (#2368) #2393

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6 changes: 5 additions & 1 deletion how-to/upgrade/using-tiup.md
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Expand Up @@ -148,7 +148,11 @@ This section describes how to perform a rolling update to the TiDB cluster and h
tiup cluster upgrade <cluster-name> v4.0.0-rc
```

Performing the rolling update to the cluster will update all components one by one. During the upgrade of TiKV, all leaders in a TiKV instance are evicted before stopping the instance. The default timeout time is 10 minutes. The instance is directly stopped after this timeout time.
Performing the rolling update to the cluster will update all components one by one. During the upgrade of TiKV, all leaders in a TiKV instance are evicted before stopping the instance. The default timeout time is 5 minutes. The instance is directly stopped after this timeout time.

To perform the upgrade immediately without evicting the leader, specify `--force` in the command above. This method causes performance jitter but not data loss.

To keep a stable performance, make sure that all leaders in a TiKV instance are evicted before stopping the instance. You can set `--transfer-timeout` to a super large value, for example, `--transfer-timeout 100000000` (unit: second).

### Verify the cluster version

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