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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-968) Reduce shuffle and merge should be done a child JVM
Date Thu, 01 Feb 2007 18:10:06 GMT
Reduce shuffle and merge should be done a child JVM
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                 Key: HADOOP-968
                 URL: https://issues.apache.org/jira/browse/HADOOP-968
             Project: Hadoop
          Issue Type: Improvement
          Components: mapred
    Affects Versions: 0.10.1
            Reporter: Owen O'Malley
         Assigned To: Devaraj Das
             Fix For: 0.12.0


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.

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