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From "Francis Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Thu, 06 Sep 2012 17:49:08 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13449854#comment-13449854
] 

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

{quote}I think what I wanted to say was that we may need to reserve some region servers from
the Default pool for emergency scenario so that each group can have decent size all the time.{quote}

I see, that could be something we could add later on. There are some scenarios we have to
think more thoroughly about. A conservative group sizing and manual intervention should be
good enough for now? Let's get the basics fully baked first.
                
> 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-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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