MapFile constructor should accept Progressible
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                 Key: HADOOP-636
                 URL: http://issues.apache.org/jira/browse/HADOOP-636
             Project: Hadoop
          Issue Type: New Feature
          Components: io
            Reporter: Doug Cutting


MapFile's constructor should accept a Progressible and pass it down to the 
underlying SequenceFiles.  This permits DFS to signal task progress while 
writing blocks, and can keep reduce tasks from timing out when block writes are 
slow.

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