Janos Kovacs created HIVE-26145:
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             Summary: Disable notification cleaner if interval is zero
                 Key: HIVE-26145
                 URL: https://issues.apache.org/jira/browse/HIVE-26145
             Project: Hive
          Issue Type: Sub-task
          Components: Metastore
            Reporter: Janos Kovacs
            Assignee: Janos Kovacs


Many of the housekeeping/background tasks can be turned off in case of having 
multiple instances running parallel. 
Some are controlled via the housekeeping node configuration, others are not 
started if their frequency is set to zero.

The DB-Notification cleaner unfortunately doesn't have this functionality which 
makes all instances to race for the lock on the backend HMS database. 
Goal is to add change to be able to turn cleaner off in case if there are 
multiple instances running (be able to bound it to the housekeeping instance).  



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