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From "Thomas Graves (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4213) nodemanager should cleanup running containers when shutdown
Date Tue, 01 May 2012 13:35:48 GMT
Thomas Graves created MAPREDUCE-4213:

             Summary: nodemanager should cleanup running containers when shutdown
                 Key: MAPREDUCE-4213
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4213
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2, nodemanager
    Affects Versions: 0.23.3
            Reporter: Thomas Graves

Currently the nodemanager doesn't cleanup running containers when it gets restarted.  This
can cause containers to get lost and stick around forever.  We've seen this happen multiple
times when the RM is restarted. When the RM is brought back up, it doesn't know about what
was running on the cluster, it tells the NMs to reboot and when the NM reboots it loses what
it had running. If there are any containers that are behaving badly there is no one left that
knows about them to kill them. 

We should try to kill any running containers when the node manager is shutting down.  We should
also check when the nodemanager is being brought back up - but that will be a separate jira.

This might change a bit when RM restart is implemented if tasks can actually survive across
RM/NM being rebooted, but that can be addressed at that point.

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