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Posted to mapreduce-dev@hadoop.apache.org by "Arun C Murthy (Created) (JIRA)" <ji...@apache.org> on 2012/02/23 16:10:49 UTC

[jira] [Created] (MAPREDUCE-3902) MR AM should reuse containers for map tasks

MR AM should reuse containers for map tasks
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                 Key: MAPREDUCE-3902
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3902
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: applicationmaster, mrv2
            Reporter: Arun C Murthy
            Assignee: Arun C Murthy


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:
# Consider data-locality when re-using containers
# Consider the new shuffle - ensure that reduces fetch output of the whole container at once (i.e. all maps) 

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