Use  to decommission a RegionServer component.
        - 
                Using Ambari Web, browse the
                        Hosts page. 
            
- 
                Find and click the FQDN of the host on which the RegionServer component
                    resides.
            
- 
                Using the Actions menu, click .
                
                The UI shows Decommissioning status while in process. 
When this RegionServer decommissioning process is finished,
            the Action option shows Recommission.
