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From "Benjamin Reed (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-589) Locality hints for Reduce
Date Tue, 10 Oct 2006 14:22:19 GMT
Locality hints for Reduce
-------------------------

                 Key: HADOOP-589
                 URL: http://issues.apache.org/jira/browse/HADOOP-589
             Project: Hadoop
          Issue Type: New Feature
          Components: mapred
            Reporter: Benjamin Reed


It would be nice if we could add method to OutputFormat that would allow a job to indicate
where a reducer for a given partition should should run. This is similar to the getSplits()
method on InputFormat. In our application the reducer is using other data in addition to the
map outputs during processing and data accesses could be made more efficient if the JobTracker
scheduled the reducers to run on specific hosts.

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