hex108 created YARN-2612:

             Summary: Some completed containers are not reported to NM
                 Key: YARN-2612
                 URL: https://issues.apache.org/jira/browse/YARN-2612
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
    Affects Versions: 2.6.0
            Reporter: hex108
             Fix For: 2.6.0

In YARN-1372, NM will report completed containers to RM until it gets ACK from 
RM.  If AM does not call allocate, which means that AM does not ack RM, RM will 
not ack NM. We have observed these two cases when running Mapreduce task 'pi':
1) RM sends completed containers to AM. After receiving it, AM thinks it has 
done the work and does not need resource, so it does not call allocate.
2) When AM finishes, it could not ack to RM because AM itself has not finished 

In order to solve this problem, we have two solutions:
1) When RMAppAttempt call FinalTransition, it means AppAttempt finishes, then 
RM could send this AppAttempt's completed containers to NM.
2) In  FairScheduler#nodeUpdate, if completed containers sent by NM does not 
have corresponding RMContainer, RM just ack it to NM.

We prefer to solution 2 because it is more clear and concise. However RM might 
ack same completed containers to NM many times.

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