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https://issues.apache.org/jira/browse/MAPREDUCE-1489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron Kimball updated MAPREDUCE-1489:
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Status: Patch Available (was: Open)
> DataDrivenDBInputFormat should not query the database when generating only
> one split
> ------------------------------------------------------------------------------------
>
> 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
> Attachments: MAPREDUCE-1489.patch
>
>
> 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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