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https://issues.apache.org/jira/browse/HBASE-16114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15355840#comment-15355840
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Thiruvel Thirumoolan commented on HBASE-16114:
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The test failures are unrelated to this patch. I haven't added new test cases
since this is an optimization and the code is already tested via
TestTableInputFormatScan[1,2].
> Get regionLocation of only required regions for MR jobs
> -------------------------------------------------------
>
> Key: HBASE-16114
> URL: https://issues.apache.org/jira/browse/HBASE-16114
> Project: HBase
> Issue Type: Improvement
> Components: mapreduce
> Affects Versions: 1.2.1
> Reporter: Thiruvel Thirumoolan
> Priority: Minor
> Fix For: 2.0.0, 1.3.0
>
> Attachments: HBASE-16114.master.001.patch,
> HBASE-16114.master.001.patch, HBASE-16114.master.002.patch
>
>
> We should only get the location of regions required during the MR job. This
> will help for jobs with large regions but the job itself scans only a small
> portion of it. Similar changes can be seen in MultiInputFormatBase.java.
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