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  1. Hadoop Map/Reduce
  2. MAPREDUCE-2931

CLONE - LocalJobRunner should support parallel mapper execution

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 1.2.0
    • None
    • None
    • Reviewed

    Description

      The LocalJobRunner currently supports only a single execution thread. Given the prevalence of multi-core CPUs, it makes sense to allow users to run multiple tasks in parallel for improved performance on small (local-only) jobs.

      It is necessary to patch back MAPREDUCE-1367 into Hadoop 0.20.X version. Also, MapReduce-434 should be submitted together.

      Attachments

        1. MAPREDUCE-1367-branch1.patch
          28 kB
          Sandy Ryza

        Issue Links

          breaks

          Bug - A problem which impairs or prevents the functions of the product. MAPREDUCE-5166 ConcurrentModificationException in LocalJobRunner

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

          Improvement - An improvement or enhancement to an existing feature or task. MAPREDUCE-1367 LocalJobRunner should support parallel mapper execution

          • Major - Major loss of function.
          • Closed

          Activity

            People

              sandyr Sandy Ryza
              forest520 Forest Tan
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              Dates

                Created:
                Updated:
                Resolved: