Deleting a Host from a Cluster
Deleting a host removes the host from the cluster.
Prerequisites
Before deleting a host, you must complete the following prerequisites:
Stop all components running on the host.
Decommission any DataNodes running on the host.
Move from the host any master components, such as NameNode or ResourceManager, running on the host.
Turn off host Maintenance Mode, if it is on.
To delete a component:
Steps
Using Ambari Web, browse the hosts page to find and click the FQDN of the host that you want to delete.
On the Host-Details page, click Host Actions.
Click Delete.
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