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From "Roman Nikitchenko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10017) HRegionPartitioner, rows directed to last partition are wrongly mapped.
Date Tue, 26 Nov 2013 14:49:36 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13832626#comment-13832626
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Roman Nikitchenko commented on HBASE-10017:
-------------------------------------------

@Ted, @Nick I had both local 'mvn test' and 'mvn site' working with this fix. Here I found
only warnings and as I remember there were no new in hbase-server. This patch modifies only
hbase-server as you can see. Probably if I knew there is so small term of storing test results
I'd saved them (results) but AFAIR no new warnings.
Again, is it possible to submit patch for some kind of automatic testing farm?





> 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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