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Posted to mapreduce-dev@hadoop.apache.org by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org> on 2013/06/03 10:54:19 UTC

[jira] [Created] (MAPREDUCE-5293) Shuffle#MergeManager should support org.apache.hadoop.mapreduce.Reducer

Tsuyoshi OZAWA created MAPREDUCE-5293:
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             Summary: Shuffle#MergeManager should support org.apache.hadoop.mapreduce.Reducer
                 Key: MAPREDUCE-5293
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5293
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
    Affects Versions: trunk
            Reporter: Tsuyoshi OZAWA
            Assignee: Tsuyoshi OZAWA
            Priority: Blocker


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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