Removing a Node Using the MapR Control System

  1. Before you start, drain the node of data by moving the node to the /decommissioned physical topology. All the data on a node in the /decommissioned topology is migrated to volumes and nodes in the /data topology.
  2. Run the following command to check if a given volume is present on the node:
    maprcli dump volumenodes -volumename <volume> -json | grep <ip:port>

    Run this command for each non-local volume in your cluster to verify that the node being removed is not storing any volume data.

  3. In the Navigation pane, expand the Cluster group and click the Nodes view.
  4. Select the checkbox beside the node or nodes you wish to remove.
  5. Click Manage Services and stop all services on the node.
  6. Wait 5 minutes. The Remove button becomes active.
  7. Click the Remove button to display the Remove Node dialog.
  8. Click Remove Node to remove the node.
Warning: If you are using Ganglia, restart all gmeta and gmon daemons in the cluster.

You can also remove a node by clicking Remove Node in the Node Properties view.