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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

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. HADOOP-964 ClassNotFoundException in ReduceTaskRunner

          • Blocker - Blocks development and/or testing work, production could not run
          • Closed

          Activity

            People

              ddas Devaraj Das
              omalley Owen O'Malley
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              Dates

                Created:
                Updated:
                Resolved: