Jian He created YARN-3999:

             Summary: Add a timeout when drain the dispatcher
                 Key: YARN-3999
                 URL: https://issues.apache.org/jira/browse/YARN-3999
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Jian He

If external systems like ATS, or ZK becomes very slow, draining all the events 
take a lot of time. If this time becomes larger than 10 mins, all applications 
will expire. We can add a timeout and stop the dispatcher even if not all 
events are drained.

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