[jira] [Created] (MAPREDUCE-6513) MR job got hanged forever when one NM unstable for some time

["Bob (JIRA)" <ji...@apache.org>]

Bob created MAPREDUCE-6513:
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             Summary: MR job got hanged forever when one NM unstable for some time
                 Key: MAPREDUCE-6513
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6513
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: applicationmaster, resourcemanager
    Affects Versions: 3.0.0
            Reporter: Bob


when job is in-progress which is having more tasks,one node became unstable due to some OS issue.After the node became unstable, the map on this node status changed to KILLED state. 

Currently maps which were running on unstable node are rescheduled, and all are in scheduled state and wait for RM assign container.Seen ask requests for map till Node is good (all those failed), there are no ask request after this. But AM keeps on preempting the reducers (it's recycling).

Finally reducers are waiting for complete mappers and mappers did n't get container..

My Question Is:
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why map requests did not sent AM ,once after node recovery.?










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