Use to delete a decommissioned component:
Decommision the component that you intend to delete.
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Using Ambari Web, browse the Hosts
page.
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Find and click the FQDN of the host on which the component resides.
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In Components, find a decommissioned component.
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If the component status is Started, stop it.
A decommissioned slave component may restart in the decommissioned state.
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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.
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Restart services.
Ambari recognizes and monitors only the remaining
components.