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  1. Hadoop Map/Reduce
  2. MAPREDUCE-3274

Race condition in MR App Master Preemtion can cause a dead lock

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Blocker
    • Resolution: Fixed
    • Affects Version/s: 0.23.0, 2.0.0-alpha
    • Fix Version/s: 0.23.0
    • Component/s: applicationmaster, mrv2
    • Labels:
      None
    • Target Version/s:
    • Hadoop Flags:
      Reviewed

      Description

      There appears to be a race condition in the MR App Master in relation to preempting reducers to let a mapper run. In the particular case that I have been debugging a reducer was selected for preemption that did not have a container assigned to it yet. When the container became available that reduce started running and the previous TA_KILL event appears to have been ignored.

        Attachments

        1. MR-3274.txt
          14 kB
          Robert Joseph Evans
        2. MR-3274.txt
          14 kB
          Robert Joseph Evans

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            People

            • Assignee:
              revans2 Robert Joseph Evans
              Reporter:
              revans2 Robert Joseph Evans

              Dates

              • Created:
                Updated:
                Resolved:

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