[jira] Commented: (HBASE-1829) Make use of start/stop row in TableInputFormat

["Ken Weiner (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-1829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12764260#action_12764260 ] 

Ken Weiner commented on HBASE-1829:
-----------------------------------

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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