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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-962) NPE in ProcfsBasedProcessTree.destroy()
Date Mon, 19 Oct 2009 00:05:31 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated MAPREDUCE-962:
------------------------------------

    Description: 
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}

  was:
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}


> 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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