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From "Joseph Doss (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4126) This is a fix both for oracle support and managing DB splits in general.
Date Mon, 09 Apr 2012 12:03:19 GMT
This is a fix both for oracle support and managing DB splits in general.
------------------------------------------------------------------------

                 Key: MAPREDUCE-4126
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4126
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: performance
    Affects Versions: 1.0.0
         Environment: Redhat 6.1 x86_64 
            Reporter: Joseph Doss
             Fix For: 1.0.0
         Attachments: hadoop.dbinputformat.query.split.patch.patch

This is and addition to an older patch that addressed oracle support. We found that in large
result sets, the map reduce was both splitting the results ( as expected ) and running a duplicate
( full result set ) on one node, resulting in a long runtime that should have been reduced
by splitting. 

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