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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4194) RegionSplitter: Split on under-loaded region servers first
Date Sat, 13 Aug 2011 12:49:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084607#comment-13084607
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Ted Yu commented on HBASE-4194:
-------------------------------

Integrated to TRUNK.

Thanks for the patch Nicholas.

> RegionSplitter: Split on under-loaded region servers first
> ----------------------------------------------------------
>
>                 Key: HBASE-4194
>                 URL: https://issues.apache.org/jira/browse/HBASE-4194
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>            Priority: Trivial
>             Fix For: 0.92.0
>
>         Attachments: HBASE-4194.patch
>
>
> When running RegionSplitter, our app devs noticed that they were getting a lot of NSREs.
 This is caused by 2 factors: 
> 1. the split itself will cause an NSRE 
> 2. any load balancing will cause one.  
> The former cannot be helped.  We can more tightly control load balancing though.  Instead
of doing a name-sorted round-robin split across RS in the tier, we could sort the RS's by
region count.  That way, we only split an RS with 10 regions after there are no more RS with
9 regions.  This will prevent the load balancing slop from kicking in and will fix the problem
where restarting RegionSplitter always starts splitting at RS #1.

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