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Posted to mapreduce-dev@hadoop.apache.org by "Jothi Padmanabhan (JIRA)" <ji...@apache.org> on 2009/09/05 06:42:58 UTC

[jira] Created: (MAPREDUCE-956) Shuffle should be broken down to only two phases (copy/reduce) instead of three (copy/sort/reduce)

Shuffle should be broken down to only two phases (copy/reduce) instead of three (copy/sort/reduce)
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                 Key: MAPREDUCE-956
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-956
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Jothi Padmanabhan


For the progress calculations and displaying on the UI, shuffle, in its current form,  is decomposed into three phases (copy/sort/reduce). Actually, the sort phase is no longer applicable. I think we should just reduce the number of phases to two and assign 50% weight-age to each of copy and reduce phases. Thoughts?

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