Hadoop Map/Reduce
  1. Hadoop Map/Reduce
  2. MAPREDUCE-3274

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

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Blocker Blocker
    • Resolution: Fixed
    • Affects Version/s: 0.23.0, 0.24.0
    • Fix Version/s: 0.23.0, 0.24.0
    • Component/s: applicationmaster, mrv2
    • Labels:
      None

      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.

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

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          People

          • Assignee:
            Robert Joseph Evans
            Reporter:
            Robert Joseph Evans
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            Dates

            • Created:
              Updated:
              Resolved:

              Development