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From "Adam Kramer (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1750) Make #rows avail. to reducers as environment variable
Date Mon, 03 May 2010 03:19:55 GMT
Make #rows avail. to reducers as environment variable

                 Key: MAPREDUCE-1750
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1750
             Project: Hadoop Map/Reduce
          Issue Type: Wish
            Reporter: Adam Kramer
            Priority: Minor

Given that there is a sort phase between the copy phase and the reduce phase, it seems like
there is a chance for counting during sort.

It would be nice if my reducers could have access to an environment variable, say, mapred.reduce.rows,
that contained the number of rows present for this reducer (as counted during the sort step).

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