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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-962) NPE in ProcfsBasedProcessTree.destroy()
Date Tue, 06 Oct 2009 06:54:31 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762530#action_12762530
] 

Hadoop QA commented on MAPREDUCE-962:
-------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12421380/MR-962.v1.patch
  against trunk revision 819740.

    +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 findbugs.  The patch does not introduce any new Findbugs warnings.

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

    -1 core tests.  The patch failed core unit tests.

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

Test results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/142/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/142/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/142/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/142/console

This message is automatically generated.

> NPE in ProcfsBasedProcessTree.destroy()
> ---------------------------------------
>
>                 Key: MAPREDUCE-962
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-962
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>            Reporter: Vinod K V
>            Assignee: Ravi Gummadi
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-6232.patch, MR-962.patch, MR-962.v1.patch
>
>
> This causes the following exception in TaskMemoryManagerThread. I observed this while
running TestTaskTrackerMemoryManager.
> {code}
> 2009-09-02 12:08:25,835 WARN  mapred.TaskMemoryManagerThread (TaskMemoryManagerThread.java:run(239))
- Uncaught exception in TaskMemoryManager while managing memory of attempt_20090902120812252_0001_m_000003_0
: java.lang.NullPointerException
>         at org.apache.hadoop.util.ProcfsBasedProcessTree.assertPidPgrpidForMatch(ProcfsBasedProcessTree.java:234)
>         at org.apache.hadoop.util.ProcfsBasedProcessTree.assertAndDestroyProcessGroup(ProcfsBasedProcessTree.java:257)
>         at org.apache.hadoop.util.ProcfsBasedProcessTree.destroy(ProcfsBasedProcessTree.java:286)
>         at org.apache.hadoop.mapred.TaskMemoryManagerThread.run(TaskMemoryManagerThread.java:229)
> {code}

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