Re: How to add the `label` configuration if `label` of TiKV was not configured when I deployed the TiDB

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Chun Chen

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Aug 3, 2018, 5:33:47 AM8/3/18

to TiDB user group

The configuration of TiDB `label` is related to the cluster deployment architecture. It is important and is the basis for PD to execute global management and scheduling.

If you did not configure `label` when deploying the cluster previously, you can adjust the deployment structure by manually adding the `location-labels` information using the PD management tool `pd-ctl`. For example, `config set location-labels "zone, rack, host"`. You should configure it based on the practical `label` level name.

On Friday, August 3, 2018 at 4:53:50 PM UTC+8, Chun Chen wrote:

When I deployed the TiDB cluster for the first time, I did not configure `label` of TiKV. Now I want to add the `label` configuration but cannot find a way in TiDB documentation. What should I do?

Menglong Huang

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Aug 3, 2018, 5:59:18 AM8/3/18

to TiDB user group

First of all, you need to register location labels to PD. This is normally done by using pd-ctl:

» config show replication
{
  "max-replicas": 3,
  "location-labels": ""
}


» config set location-labels zone,host
Success!


» config show replication
{
  "max-replicas": 3,
  "location-labels": "zone,host"
}

Next you need to specify location labels for different tikv-servers. You can directly update the configuration files and restart all instances in turn. Here is the config example:

labels = { zone = "cn-west-1", host = "192.168.0.1" }

As an alternative, you can also set their labels using pd-ctl to avoid restarting:

» store 1
{
  "store": {
    "id": 1,
    "address": "192.168.0.1:20161",
    "version": "2.1.0-beta",
    "state_name": "Up"
  },
  "status": {
    "capacity": "10 GiB",
    "available": "10 GiB",
    "leader_count": 14,
    "leader_weight": 1,
    "leader_score": 14,
    "leader_size": 14,
    "region_count": 14,
    "region_weight": 1,
    "region_score": 14,
    "region_size": 14,
    "start_ts": "2018-08-03T17:35:06+08:00",
    "last_heartbeat_ts": "2018-08-03T17:48:16.654551232+08:00",
    "uptime": "13m10.654551232s"
  }
}


» store label 1 zone cn-west-1
» store label 1 host 192.168.0.1
» store 1
{
  "store": {
    "id": 1,
    "address": "192.168.0.1:20161",
    "labels": [
      {
        "key": "zone",
        "value": "cn-west-1"
      },
      {
        "key": "host",
        "value": "192.168.0.1"
      }
    ],
    "version": "2.1.0-beta",
    "state_name": "Up"
  },
  "status": {
    "capacity": "10 GiB",
    "available": "10 GiB",
    "leader_count": 14,
    "leader_weight": 1,
    "leader_score": 14,
    "leader_size": 14,
    "region_count": 14,
    "region_weight": 1,
    "region_score": 14,
    "region_size": 14,
    "start_ts": "2018-08-03T17:35:06+08:00",
    "last_heartbeat_ts": "2018-08-03T17:48:46.85510699+08:00",
    "uptime": "13m40.85510699s"
  }
}