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From "Robert Joseph Evans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3862) Nodemanager can appear to hang on shutdown due to lingering DeletionService threads
Date Fri, 17 Feb 2012 20:52:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13210546#comment-13210546

Robert Joseph Evans commented on MAPREDUCE-3862:

I like the approach that this is taking.  we have to be able to handle starting up from an
unclean shutdown, so files need to be deleted on startup as well.  +1 for the patch.  
> Nodemanager can appear to hang on shutdown due to lingering DeletionService threads
> -----------------------------------------------------------------------------------
>                 Key: MAPREDUCE-3862
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3862
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, nodemanager
>    Affects Versions: 0.23.1
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>         Attachments: MAPREDUCE-3862.patch, MAPREDUCE-3862.patch
> When a nodemanager attempts to shutdown cleanly, it's possible for it to appear to hang
due to lingering DeletionService threads.  This can occur when yarn.nodemanager.delete.debug-delay-sec
is set to a relatively large value and one or more containers executes on the node shortly
before the shutdown.
> The DeletionService is never calling {{setExecuteExistingDelayedTasksAfterShutdownPolicy()}}
on the ScheduledThreadPoolExecutor, and it defaults to waiting for all scheduled tasks to
complete before exiting.

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