the combiner output counter is really counting number of input keys to the 
combiner
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                 Key: HADOOP-2628
                 URL: https://issues.apache.org/jira/browse/HADOOP-2628
             Project: Hadoop
          Issue Type: Bug
            Reporter: Owen O'Malley
             Fix For: 0.16.0


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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