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From "Roman Nikitchenko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10017) HRegionPartitioner, rows directed to last partition are wrongly mapped.
Date Thu, 21 Nov 2013 14:57:36 GMT
Roman Nikitchenko created HBASE-10017:
-----------------------------------------

             Summary: HRegionPartitioner, rows directed to last partition are wrongly mapped.
                 Key: HBASE-10017
                 URL: https://issues.apache.org/jira/browse/HBASE-10017
             Project: HBase
          Issue Type: Bug
          Components: mapreduce
    Affects Versions: 0.94.6
            Reporter: Roman Nikitchenko


Inside HRegionPartitioner class there is getPartition() method which should map first numPartitions
regions to appropriate partitions 1:1. But based on condition last region is hashed which
could lead to last reducer not having any data. This is considered serious issue.

I reproduced this only starting from 16 regions per table. Original defect was found in 0.94.6
but at least today's trunk and 0.91 branch head have the same HRegionPartitioner code in this
part which means the same issue.




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