Tsuyoshi OZAWA created MAPREDUCE-5294:
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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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