Putting all Hosts in an Upgrade Domain group into Maintenance Mode

Steps to put hosts in an Upgrade Domain into Maintenance Mode.

  1. In Cloudera Manager, select the cluster where you want to decommission hosts.
  2. Click Hosts > All Hosts.
  3. In the Filters section, click Upgrade Domain.
  4. Select an Upgrade Domain.
    The All Hosts list now displays only the hosts belonging to the Upgrade Domain.
  5. Select all of the hosts.
  6. Click Actions for Selected > Begin Maintenance (Suppress Alerts/Decommission.
    The Begin Maintenance (Suppress Alerts/Decommission) dialog box opens. The role instances running on the hosts display at the top. You can also use this dialog box to decommission the host.
  7. Select the Take DataNode offline option to put the hosts into Maintenance Mode.
    In this mode, alerts from the hosts are suppressed until the host exits Maintenance Mode. The events, however, are still logged. Hosts that are currently in Maintenance Mode display the icon.
  8. Click Begin Maintenance.
    The Host Decommission Command dialog box opens and displays the progress of the command.