Radim Kolar created MAPREDUCE-5153:
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Summary: Support for running combiners without reducers
Key: MAPREDUCE-5153
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5153
Project: Hadoop Map/Reduce
Issue Type: New Feature
Reporter: Radim Kolar
scenario: Workflow mapper -> sort -> combiner -> hdfs
No api change is need, if user set combiner class and reducers = 0 then run
combiner and sent output to HDFS.
Popular libraries such as scalding and cascading are offering this
functionality, but they use caching entire mapper output in memory.
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