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https://issues.apache.org/jira/browse/HADOOP-2628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved HADOOP-2628.
-----------------------------

    Resolution: Not A Problem

This was resolved at some point in history. We have proper in/out counters and 
tests for it today.
                
> the combiner output counter is really counting number of input keys to the 
> combiner
> -----------------------------------------------------------------------------------
>
>                 Key: HADOOP-2628
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2628
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Owen O'Malley
>
> Currently, each key that is read by the combiner bumps the number of combiner 
> outputs. We should have both combiner input keys and combiner output record 
> counters.

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