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From "Jason Lowe (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3862) Nodemanager can appear to hang on shutdown due to lingering DeletionService threads
Date Wed, 15 Feb 2012 17:32:59 GMT
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


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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