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From "Biju Nair (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17130) Add support to specify an arbitrary number of reducers when writing HFiles for bulk load
Date Wed, 11 Oct 2017 21:00:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16200950#comment-16200950
] 

Biju Nair commented on HBASE-17130:
-----------------------------------

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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