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  1. Hadoop Common
  2. HADOOP-1154

streaming hang. (PipeMapRed$MROutputThread gone)

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 0.13.0
    • None
    • None

    Description

      One streaming reducer ('cat') hang,

      '/bin/cat' reducer waiting in
      0 S _____ 24587 24557 0 75 0 - 631 pipe_w Mar22 ? 00:00:02 /bin/cat

      strace showed that it's waiting in write.
      $ strace -p 24587
      Process 24587 attached - interrupt to quit
      write(1, "________ "..., 138 <unfinished ...>
      Process 24587 detached

      When I looked at the jstack of ReduceTask process, I couldn't find the PipeMapRed$MROutputThread.

      Attachments

        1. PipeReducer.jstack
          6 kB
          Koji Noguchi
        2. 1154-2.patch
          3 kB
          Koji Noguchi

        Activity

          People

            knoguchi Koji Noguchi
            knoguchi Koji Noguchi
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            Dates

              Created:
              Updated:
              Resolved: