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https://issues.apache.org/jira/browse/MAPREDUCE-962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinod K V updated MAPREDUCE-962:
--------------------------------
Affects Version/s: 0.21.0
> 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
> Affects Versions: 0.21.0
> Reporter: Vinod K V
> Assignee: Ravi Gummadi
> Fix For: 0.21.0
>
> Attachments: HADOOP-6232.patch, MR-962.patch, MR-962.v1.1.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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