Gopal V created TEZ-1073:
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             Summary: RLE IFile merge() fastpath
                 Key: TEZ-1073
                 URL: https://issues.apache.org/jira/browse/TEZ-1073
             Project: Apache Tez
          Issue Type: Bug
    Affects Versions: 0.5.0
            Reporter: Gopal V
            Assignee: Gopal V
            Priority: Minor
         Attachments: TEZ-1073.WIP.patch

IFile iterators actually consist of a tri-state - NEW_KEY, SAME_KEY and NO_KEY.

This can be used to avoid rebalancing the priority queue when the same reader 
is returning SAME_KEY in its reader during the initial merge operation in the 
reducer.



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