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https://issues.apache.org/jira/browse/HBASE-1829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12764260#action_12764260
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Ken Weiner commented on HBASE-1829:
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Does this patch guarantee that the only rows passed to the mapper are the ones
that fall between the start and stop rows specified in the Scan? Or will I get
rows that fall before the start row within the first split and some rows that
fall after the end row within the last split?
> Make use of start/stop row in TableInputFormat
> ----------------------------------------------
>
> Key: HBASE-1829
> URL: https://issues.apache.org/jira/browse/HBASE-1829
> Project: Hadoop HBase
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.20.0
> Reporter: Lars George
> Assignee: Lars George
> Priority: Minor
> Fix For: 0.21.0
>
> Attachments: HBASE-1829-v2.patch, HBASE-1829.patch
>
>
> Since we can now specify a start and stop row with the Scan that is handed to
> the TIF we can reduce the splits to the regions that contain these rows. That
> allows to test large MR jobs on a single region for example.
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