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Apr 17, 2020
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tiflash: update tiflash upgrade doc (#2309) #2324

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18 changes: 15 additions & 3 deletions reference/tiflash/upgrade.md
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Expand Up @@ -10,22 +10,34 @@ category: reference
>
> To upgrade TiFlash from the Pre-RC version to a later version, contact [PingCAP](mailto:info@pingcap.com) for more information and help.

Currently, you cannot upgrade TiFlash by running the `tiup cluster upgrade` command. Instead, take the following steps to upgrade TiFlash:

Before the upgrade, make sure that the cluster is started. To upgrade TiFlash nodes, take the following steps:

1. Run the upgrade command:
1. Refer to [Scale in a TiFlash node](/how-to/scale/with-tiup.md#sclale-in-a-tiflash-node), and scale in all the TiFlash nodes.

2. Run the upgrade command:

{{< copyable "shell-regular" >}}

```shell
tiup cluster upgrade test v4.0.0-rc
```

2. View the cluster status:
3. Run the scale-out command:

{{< copyable "shell-regular" >}}

```shell
tiup cluster scale-out test scale-out.yaml
```

4. View the cluster status:

{{< copyable "shell-regular" >}}

```shell
tiup cluster display test
```

3. Access the monitoring platform using your browser, and view the status of the cluster.
5. Access the monitoring platform using your browser, and view the status of the cluster.