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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1059) distcp can generate uneven map task assignments
Date Mon, 05 Oct 2009 23:47:31 GMT
distcp can generate uneven map task assignments
-----------------------------------------------

                 Key: MAPREDUCE-1059
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1059
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: distcp
            Reporter: Aaron Kimball
            Assignee: Aaron Kimball
         Attachments: MAPREDUCE-1059.patch

distcp writes out a SequenceFile containing the source files to transfer, and their sizes.
Map tasks are created over spans of this file, representing files which each mapper should
transfer. In practice, some transfer loads yield many empty map tasks and a few tasks perform
the bulk of the work.

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