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https://issues.apache.org/jira/browse/HBASE-4914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Duo Zhang resolved HBASE-4914.
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Resolution: Won't Fix
> 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: Major
>
> 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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