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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3738) NM can hang during shutdown if AppLogAggregatorImpl thread dies unexpectedly
Date Thu, 23 Feb 2012 21:37:56 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215077#comment-13215077

Hadoop QA commented on MAPREDUCE-3738:

+1 overall.  Here are the results of testing the latest attachment 
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed unit tests in .

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1917//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1917//console

This message is automatically generated.
> NM can hang during shutdown if AppLogAggregatorImpl thread dies unexpectedly
> ----------------------------------------------------------------------------
>                 Key: MAPREDUCE-3738
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3738
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, nodemanager
>    Affects Versions: 0.23.1, 0.24.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: MAPREDUCE-3738.patch, livehistdump.txt
> If an AppLogAggregator thread dies unexpectedly (e.g.: uncaught exception like OutOfMemoryError
in the case I saw) then this will lead to a hang during nodemanager shutdown.  The NM calls
AppLogAggregatorImpl.join() during shutdown to make sure log aggregation has completed, and
that method internally waits for an atomic boolean to be set by the log aggregation thread
to indicate it has finished.  Since the thread was killed off earlier due to an uncaught exception,
the boolean will never be set and the NM hangs during shutdown repeating something like this
every second in the log file:
> 2012-01-25 22:20:56,366 INFO org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.AppLogAggregatorImpl:
Waiting for aggregation to complete for application_1326848182580_2806

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