Hadoop Map/Reduce
  1. Hadoop Map/Reduce
  2. MAPREDUCE-3902

MR AM should reuse containers for map tasks, there-by allowing fine-grained control on num-maps for users without need for CombineFileInputFormat etc.

    Details

    • Type: Improvement Improvement
    • Status: Open
    • Priority: Major Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: applicationmaster, mrv2
    • Labels:
      None

      Description

      The MR AM is now in a great position to reuse containers across (map) tasks. This is something similar to JVM re-use we had in 0.20.x, but in a significantly better manner:

      1. Consider data-locality when re-using containers
      2. Consider the new shuffle - ensure that reduces fetch output of the whole container at once (i.e. all maps) : MAPREDUCE-4525
      1. MAPREDUCE-3902.patch
        74 kB
        Arun C Murthy
      2. MAPREDUCE-3902.2.patch
        55 kB
        Tsuyoshi OZAWA
      3. AM_ContainerRefactor.pdf
        151 kB
        Siddharth Seth
      4. AMContainerRefactorNotes.pdf
        58 kB
        Siddharth Seth

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            People

            • Assignee:
              Siddharth Seth
              Reporter:
              Arun C Murthy
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              Dates

              • Created:
                Updated:

                Development