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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4194) RegionSplitter: Split on low-loaded regions first
Date Thu, 11 Aug 2011 21:50:27 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nicolas Spiegelberg updated HBASE-4194:
---------------------------------------

    Attachment: HBASE-4194.patch

> RegionSplitter: Split on low-loaded regions 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 sorted the RS 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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