Delete a component

Use Component > Actionto delete a decommissioned component:

1. Using Ambari Web, browse the Hosts page.
2. Find and click the FQDN of the host on which the component resides.
3. In Components, find a decommissioned component.
4. If the component status is Started, stop it.
   A decommissioned slave component may restart in the decommissioned state.
5. Click Delete from the Action drop-down menu.
   Deleting a slave component, such as a DataNode does not automatically inform a master component, such as a NameNode, to remove the slave component from its exclusion list.
   Adding a deleted slave component back into the cluster presents the following issue: The added slave remains decommissioned from the master's perspective. Restart the master component, as a work-around.
6. Restart services.