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From "Thomas Graves (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4213) nodemanager should cleanup running containers when shutdown
Date Tue, 01 May 2012 19:30:50 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13265998#comment-13265998

Thomas Graves commented on MAPREDUCE-4213:

It would terminate containers on startup in cases where NM didn't shut down gracefully or
somehow missed something on shutdown - hardware issues, NM crashes, etc.  

> 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
> 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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