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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3443) map outputs should not be renamed between partitions
Date Sun, 25 May 2008 05:23:55 GMT
map outputs should not be renamed between partitions

                 Key: HADOOP-3443
                 URL: https://issues.apache.org/jira/browse/HADOOP-3443
             Project: Hadoop Core
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.17.0
            Reporter: Owen O'Malley
            Assignee: Owen O'Malley
            Priority: Critical

If a map finishes with out having to spill its data buffer, the map outputs are sorted and
written to disk. However, no care is taken to make sure that the same partition is used to
write it out before it is renamed. On nodes with multiple disks assigned to the task trackers,
this will likely cause an addition read/write cycle to disk that is very expensive.

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