Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 0.20.1
    • Fix Version/s: 0.22.0
    • Component/s: contrib/streaming
    • Labels:
      None
    • Hadoop Flags:
      Reviewed
    • Release Note:
      Fixed an NPE in streaming that occurs when there is no input to reduce and the streaming reducer sends status updates by writing "reporter:status: xxx" statements to stderr.

      Description

      Some reduce tasks fail with following NPE
      java.lang.RuntimeException: java.lang.NullPointerException
      at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:325)
      at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:540)
      at org.apache.hadoop.streaming.PipeReducer.close(PipeReducer.java:137)
      at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:474)
      at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:412)
      at org.apache.hadoop.mapred.Child.main(Child.java:159)
      Caused by: java.lang.NullPointerException
      at org.apache.hadoop.streaming.PipeMapRed$MRErrorThread.setStatus(PipeMapRed.java:517)
      at org.apache.hadoop.streaming.PipeMapRed$MRErrorThread.run(PipeMapRed.java:449)

      1. 1813.patch
        7 kB
        Ravi Gummadi
      2. 1813.v1.patch
        12 kB
        Ravi Gummadi
      3. 1813.v1.2.patch
        13 kB
        Ravi Gummadi
      4. 1813.v1.3.patch
        31 kB
        Ravi Gummadi
      5. 1813.v1.4.patch
        32 kB
        Ravi Gummadi

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            • Assignee:
              Ravi Gummadi
              Reporter:
              Amareshwari Sriramadasu
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              Dates

              • Created:
                Updated:
                Resolved:

                Development