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From "Tsuyoshi OZAWA (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-5294) Shuffle#MergeManager should support org.apache.hadoop.mapreduce.Reducer
Date Mon, 03 Jun 2013 08:58:20 GMT
Tsuyoshi OZAWA created MAPREDUCE-5294:

             Summary: Shuffle#MergeManager should support org.apache.hadoop.mapreduce.Reducer
                 Key: MAPREDUCE-5294
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5294
             Project: Hadoop Map/Reduce
          Issue Type: Sub-task
          Components: mrv2
    Affects Versions: trunk, 2.1.0-beta, 2.0.5-alpha
            Reporter: Tsuyoshi OZAWA
            Assignee: Tsuyoshi OZAWA

Shuffle#MergeManager only accepts org.apache.hadoop.mapred.Reducer currently. Because of this,
Reduce-side Combiner is not used when using the new API, and just ignored. By supporting it
and using the feature from ReduceTask, Reduce-side combiner can be enabled with new API. Please
see MAPREDUCE-5221 for more detail.

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