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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