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Restarting a Cluster

If a cluster stops working, you can restart it to restore normal running. Only clusters in the Available or Abnormal status can be restarted.

Quick Restart

  • The cluster is in the Available or Abnormal status.
  • There are no running tasks, such as importing data, searching for data on the cluster.
  • The cluster is unavailable during quick restart. If quick restart fails, data may be lost or the cluster may become unavailable. Therefore, exercise caution when performing this operation.
  • If the cluster you want to restart is available, you are advised to stop all data processing tasks on the cluster before restarting it. If there are running tasks, for example, importing data, searching for data, the transmitted data may be lost upon the restart. Therefore you are advised to stop all cluster tasks before the quick restart.
  1. Log in to the CSS management console.
  2. Click Clusters to switch to the Clusters page. In the row where the cluster you want to restart is located, click More > Restart in the Operation column. The Restart Cluster page is displayed. Select Quick Restart.

    The cluster is unavailable during quick restart.

  3. Refresh the page and check the cluster status. During the restart, the cluster status is Processing, and the task status is Restarting. If the cluster status changes to Available, the cluster has been restarted successfully. If the cluster status changes to Abnormal, you are advised to contact the customer service for troubleshooting.

Rolling Restart

  • Data may be lost during rolling restart. Exercise caution when performing this operation. Perform this operation in off-peak hours.
  • Rolling restart is supported only when the number of nodes in a cluster is greater than or equal to three.
  • When the data volume is large, rolling restart takes a long time.
  1. Log in to the CSS management console.
  2. Click Clusters to switch to the Clusters page. In the row where the cluster you want to restart is located, click More > Restart in the Operation column. The Restart Cluster page is displayed. Select Rolling Restart.

    During the rolling restart, the cluster is able to provide services, and only the node that is being restarted is unavailable. When a client fails to access one node, try other nodes.

  3. Refresh the page and check the cluster status. During the restart, the cluster status is Processing, and the task status is Restarting. If the cluster status changes to Available, the cluster has been restarted successfully. If the cluster status changes to Abnormal, you are advised to contact the customer service for troubleshooting.
Parent topic: Managing Clusters