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https://issues.apache.org/jira/browse/HBASE-5140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028806#comment-14028806
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Andrew Purtell commented on HBASE-5140:
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bq. Why is this deemed irrelevant?
No activity since March 2012.
> TableInputFormat subclass to allow N number of splits per region during MR
> jobs
> -------------------------------------------------------------------------------
>
> Key: HBASE-5140
> URL: https://issues.apache.org/jira/browse/HBASE-5140
> Project: HBase
> Issue Type: New Feature
> Components: mapreduce
> Affects Versions: 0.90.4
> Reporter: Josh Wymer
> Priority: Trivial
> Labels: mapreduce, split
> Attachments:
> Added_functionality_to_TableInputFormat_that_allows_splitting_of_regions.patch,
>
> Added_functionality_to_TableInputFormat_that_allows_splitting_of_regions.patch.1,
> Added_functionality_to_split_n_times_per_region_on_mapreduce_jobs.patch
>
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> In regards to [HBASE-5138|https://issues.apache.org/jira/browse/HBASE-5138] I
> am working on a patch for the TableInputFormat class that overrides getSplits
> in order to generate N number of splits per regions and/or N number of splits
> per job. The idea is to convert the startKey and endKey for each region from
> byte[] to BigDecimal, take the difference, divide by N, convert back to
> byte[] and generate splits on the resulting values. Assuming your keys are
> fully distributed this should generate splits at nearly the same number of
> rows per split. Any suggestions on this issue are welcome.
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