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https://issues.apache.org/jira/browse/HBASE-4914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235650#comment-13235650
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Lars Hofhansl commented on HBASE-4914:
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Please comment today on why this is a blocker for 0.94. Otherwise I'll move
this out of 0.94.
> Enhance MapReduce TableInputFormat to Support N-mappers per Region
> ------------------------------------------------------------------
>
> Key: HBASE-4914
> URL: https://issues.apache.org/jira/browse/HBASE-4914
> Project: HBase
> Issue Type: Sub-task
> Components: client, regionserver
> Reporter: Nicolas Spiegelberg
> Priority: Blocker
> Fix For: 0.94.0
>
>
> Current TableInputFormat based MR jobs create exactly one mapper per region
> where each mapper sets one Scan with appropriate start/stop row keys. This
> change allows jobs to be run with any number of mappers per region, so that
> when a mapper fails, there will be less data to be reprocessed.
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