Varun Saxena created YARN-3916:
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             Summary: DrainDispatcher#await should wait till event has been 
completely handled
                 Key: YARN-3916
                 URL: https://issues.apache.org/jira/browse/YARN-3916
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
    Affects Versions: 2.7.0
            Reporter: Varun Saxena
            Assignee: Varun Saxena
            Priority: Critical


DrainDispatcher#await should wait till event has been completely handled.
Currently it only checks for whether event queue has become empty.

And in many tests we directly check for a state to be changed after calling 
await.
Sometimes, the states do not change by the time we check them as event has not 
been completely handled.

This is causing test failures such as YARN-3909 and YARN-3910 and may cause 
other test failures as well.



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