You can gracefully shut down an HBase RegionServer using Cloudera
Manager.
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In Cloudera Manager, select the HBase service.
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Click the Instance tab.
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From the list of Role Instances, select the RegionServer or RegionServers you
want to shut down gracefully.
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Click Actions for Selected.
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Select Decommission (Graceful Stop).
If you cancel the graceful shutdown before the Graceful Shutdown Timeout expires, you can still manually stop a RegionServer by selecting Actions for Selected > Stop, which sends a SIGTERM (kill -5) signal.