[jira] Created: (HADOOP-2399) Input key and value to combiner and reducer should be reused

Input key and value to combiner and reducer should be reused
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                 Key: HADOOP-2399
                 URL: https://issues.apache.org/jira/browse/HADOOP-2399
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.15.1
            Reporter: Owen O'Malley
            Assignee: Owen O'Malley
             Fix For: 0.16.0


Currently, the input key and value are recreated on every iteration for input to the combiner and reducer. It would speed up the system substantially if we reused the keys and values. The down side of doing it, is that it may break applications that count on holding references to previous keys and values, but I think it is worth doing.

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