Roman Nikitchenko created HBASE-10017:
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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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