Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.21.0
    • Fix Version/s: 0.21.0
    • Component/s: tasktracker
    • Labels:
      None
    • Hadoop Flags:
      Reviewed
    • Release Note:
      Fixes an issue of NPE in ProcfsBasedProcessTree in a corner case.

      Description

      This causes the following exception in TaskMemoryManagerThread. I observed this while running TestTaskTrackerMemoryManager.

      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)
      

        Attachments

        1. HADOOP-6232.patch
          1 kB
          Ravi Gummadi
        2. MR-962.patch
          4 kB
          Ravi Gummadi
        3. MR-962.v1.patch
          4 kB
          Ravi Gummadi
        4. MR-962.v1.1.patch
          4 kB
          Ravi Gummadi

          Activity

            People

            • Assignee:
              ravidotg Ravi Gummadi
              Reporter:
              vinodkv Vinod Kumar Vavilapalli
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              Dates

              • Created:
                Updated:
                Resolved: