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https://issues.apache.org/jira/browse/MAPREDUCE-5153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13720740#comment-13720740
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Radim Kolar commented on MAPREDUCE-5153:
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its very simple to implement.
If you want to push things forward then do it.
> 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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