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From "Jerry Chen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4891) Pluggable merge at reduce side
Date Wed, 19 Dec 2012 03:06:12 GMT
Jerry Chen created MAPREDUCE-4891:
-------------------------------------

             Summary: Pluggable merge at reduce side
                 Key: MAPREDUCE-4891
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4891
             Project: Hadoop Map/Reduce
          Issue Type: New Feature
    Affects Versions: 3.0.0
            Reporter: Jerry Chen


The current implementation of sort in MapReduce is cooperated by Map side sort and Reduce
side merge.  MAPREDUCE-2454 provided pluggable sort at the Map side currently and pluggable
shuffle at Reduce side, while no pluggable merger provided.

Considering a general need of hash grouping and join, we may need to replace both the Map
Sort and Reduce merge with a more light weight hash grouping alorithm. A general pluggable
merge would help support this need.

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