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https://issues.apache.org/jira/browse/HBASE-17130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16200950#comment-16200950
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Biju Nair commented on HBASE-17130:
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Hi [~esteban], would like to know whether you had a patch for this ticket? This
change will be of great help for our bulk load process.
> Add support to specify an arbitrary number of reducers when writing HFiles
> for bulk load
> ----------------------------------------------------------------------------------------
>
> Key: HBASE-17130
> URL: https://issues.apache.org/jira/browse/HBASE-17130
> Project: HBase
> Issue Type: Improvement
> Components: mapreduce
> Reporter: Esteban Gutierrez
> Assignee: Esteban Gutierrez
>
> From the discussion from HBASE-16894 there is a set of use cases where
> writing to multiple regions in a single reducer can be helpful to reduce the
> overhead of MR jobs when a large number of regions exist in an HBase cluster
> and some regions can present a data skew, e.g. 100s or 1000s of regions with
> a very small number of rows vs. regions with 10s or millions or rows as part
> of the same job. And merging regions is not an option for the use case.
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