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Date: Tue, 6 Nov 2012 00:16:14 +0000 (UTC)
From: "Francis Liu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <1247794792.71501.1352160974805.JavaMail.jiratomcat@arcas>
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Subject: [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
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    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491075#comment-13491075 ] 

Francis Liu commented on HBASE-6721:
------------------------------------

{quote}
Still some possible whitepsace issues though, the patch may contain mixed tabs and spaces? Some of the formatting looks off when I view it. If you are using Eclipse, we have a HBase formatter in dev-support/ now that may be helpful. 
{quote}
I'm using intellij and it doesn't seem to like the trailing whitespaces in the original file. I couldn't figure out a way to turn it off.

re: moving into another package - I see that sounds reasonable. Will do that but I will have to make some package private methods in assignment manager public.

                
> RegionServer Group based Assignment
> -----------------------------------
>
>                 Key: HBASE-6721
>                 URL: https://issues.apache.org/jira/browse/HBASE-6721
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Francis Liu
>            Assignee: Vandana Ayyalasomayajula
>             Fix For: 0.96.0
>
>         Attachments: HBASE-6721_94_2.patch, HBASE-6721_94.patch, HBASE-6721_94.patch, HBASE-6721-DesigDoc.pdf
>
>
> In multi-tenant deployments of HBase, it is likely that a RegionServer will be serving out regions from a number of different tables owned by various client applications. Being able to group a subset of running RegionServers and assign specific tables to it, provides a client application a level of isolation and resource allocation.
> The proposal essentially is to have an AssignmentManager which is aware of RegionServer groups and assigns tables to region servers based on groupings. Load balancing will occur on a per group basis as well. 
> This is essentially a simplification of the approach taken in HBASE-4120. See attached document.

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