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tools: add cluster version in pd-control #551

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merged 5 commits into from
Jul 30, 2018
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tools: add cluster version in pd-control #551

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135ee22
Merge pull request #1 from pingcap/master
yikeke Jul 23, 2018
8b8b5fe
Merge remote-tracking branch 'upstream/master' into update#812
Jul 27, 2018
61c2426
tools: add cluster version
Jul 27, 2018
2447af6
Merge remote-tracking branch 'upstream/master' into update#812
Jul 30, 2018
24f8600
tools: address the comment
Jul 30, 2018
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8 changes: 8 additions & 0 deletions tools/pd-control.md
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Expand Up @@ -144,6 +144,8 @@ Usage:
"max-replicas": 3,
"location-labels": ""
}
>> config show cluster-version // Display the current version of the cluster, which is the current minimum version of TiKV nodes in the cluster and does not correspond to the binary version.
"2.0.0"
```

- `max-snapshot-count` controls the maximum number of snapshots that a single store receives or sends out at the same time. The scheduler is restricted by this configuration to avoid taking up normal application resources. When you need to improve the speed of adding replicas or balancing, increase this value.
Expand Down Expand Up @@ -245,6 +247,12 @@ The configuration above is global. You can also tune the configuration by config
config set disable-raft-learner true // Disable Raft learner
```

- `cluster-version` is the version of the cluster, which is used to enable or disable some Features and to deal with the compatibility issues. By default, it is the minimum version of all normally running TiKV nodes in the cluster. Only when you need to roll back to an earlier version, you can set it manually.
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The last sentence:

Generally, "Only when .... can (sb)..." is an inverted sentence. It should be "Only when you need to roll back to an earlier version, can you set it manually."

But in a user document, we seldom use this sentence pattern. Suggested version:

You can set it manually only when you need to roll back it to an earlier version.


```bash
config set cluster-version 1.0.8 // Set the version of the cluster to 1.0.8
```

- `disable-remove-down-replica` is used to disable the feature of automatically deleting DownReplica. When you set it to `true`, PD does not automatically clean up the downtime replicas.

- `disable-replace-offline-replica` is used to disable the feature of migrating OfflineReplica. When you set it to `true`, PD does not migrate the offline replicas.
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