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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1489) DataDrivenDBInputFormat should not query the database when generating only one split
Date Sat, 13 Feb 2010 01:37:27 GMT
DataDrivenDBInputFormat should not query the database when generating only one split
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                 Key: MAPREDUCE-1489
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1489
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: contrib/sqoop
            Reporter: Aaron Kimball
            Assignee: Aaron Kimball


DataDrivenDBInputFormat runs a query to establish bounding values for each split it generates;
but if it's going to generate only one split (mapreduce.job.maps == 1), then there's no reason
to do this. This will remove overhead associated with a single-threaded import of a non-indexed
table since it avoids a full table scan.

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