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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 17:44:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13832794#comment-13832794
] 

Roman Nikitchenko commented on HBASE-10017:
-------------------------------------------

Definitely, HBASE-8758 has NO ANY code change but comments and failed core tests last time
(yesterday).

As for this log, the same patch, javadoc have failed and site behavior is somewhat strange
as it 100% passes on my local host. @Ted doesn't it looks for you guys you have pretty unstable
enviromnent? BTW can allocate some time to assist (not so much) but probably need initial
guidance (as HBase is one of most important tools for our company in near perspective).
?


> 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, 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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