Manually failing over to the standby NameNode
If you are running a HDFS service with HA enabled, you can manually cause the active NameNode to failover to the standby NameNode. This is useful for planned downtime—for hardware changes, configuration changes, or software upgrades of your primary host.
- Go to the HDFS service.
- Click the Instances tab.
- Click Federation and High Availability.
Locate the row for the Nameservice where you want to fail over the NameNode.
Multiple rows display only when using HDFS federation.
From the pop-up, select the NameNode that should be made active, then click
- Click Finish.