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https://issues.apache.org/jira/browse/HBASE-10017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Roman Nikitchenko updated HBASE-10017:
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Status: Patch Available (was: Open)
Patch was done against trunk HEAD (revision 1544633). Actually it fixes 3
issues against HRegionPartitioner one of which is trivial but others 2 actually
make this component completely unusable because of 2 major mapping defects. In
total I count this as critical issue to class (maybe not for product?).
> 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
> Priority: Critical
> Attachments: HBASE-10017-r1544633.patch
>
>
> 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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