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, 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.

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

        Activity

          People

          • Assignee:
            Robert Joseph Evans
            Reporter:
            Robert Joseph Evans
          • Votes:
            0 Vote for this issue
            Watchers:
            3 Start watching this issue

            Dates

            • Created:
              Updated:
              Resolved:

              Development