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From "Esteban Gutierrez (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17130) Add support to specify an arbitrary number of reducers when writing HFiles for bulk load
Date Fri, 18 Nov 2016 23:32:58 GMT
Esteban Gutierrez created HBASE-17130:
-----------------------------------------

             Summary: 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


>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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