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  1. Hadoop Common
  2. HADOOP-968

Reduce shuffle and merge should be done a child JVM

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 0.10.1
    • 0.13.0
    • None
    • None

    Description

      The Reduce's shuffle and initial merge is done in the TaskTracker's JVM. It would be better to have it run in the Task's child JVM. The advantages are:
      1. The class path and environment would be set up correctly.
      2. User code doesn't need to be loaded into the TaskTracker.
      3. Lower memory usage and contention in the TaskTracker.

      Attachments

        1. 968.apr06.patch
          82 kB
          Devaraj Das
        2. 968.apr10.patch
          79 kB
          Devaraj Das
        3. 968.apr14.patch
          79 kB
          Devaraj Das
        4. 968.apr14.patch
          79 kB
          Devaraj Das
        5. 968.patch
          82 kB
          Devaraj Das
        6. 968-reindent.patch
          79 kB
          Doug Cutting
        7. 968-with-metrics-fix.new.patch
          80 kB
          Devaraj Das
        8. 968-with-metrics-fix.patch
          80 kB
          Devaraj Das

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            ddas Devaraj Das
            omalley Owen O'Malley
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            Dates

              Created:
              Updated:
              Resolved:

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