Wangda Tan created YARN-4968:
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             Summary: A couple of AM retry unit tests need to wait 
SchedulerApplicationAttempt stopped.
                 Key: YARN-4968
                 URL: https://issues.apache.org/jira/browse/YARN-4968
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Wangda Tan
            Assignee: Wangda Tan


Noticed some unit tests, for example:

TestRMRestart#testRMRestartAfterPreemption
TestAMRestart#testShouldNotCountFailureToMaxAttemptRetry

Sometimes failure because retrying app attempt registers before the previous 
scheduler-application-attempt completely completed in scheduler.

We need to wait scheduler-application-attempt stop before retrying following 
attempts. 




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