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From "Vandana Ayyalasomayajula (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Tue, 18 Sep 2012 18:42:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13458038#comment-13458038
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Vandana Ayyalasomayajula commented on HBASE-6721:
-------------------------------------------------

At the recent HBase contributor meet up, the topic of making the assignment manager pluggable
was discussed. There was agreement that the assignment manager is a core and complex component
of HBase, and making it pluggable is not a good idea. Alternatively, suggestions were made
to introduce the region placement logic  into the load balancer which is already pluggable.
This idea works for this feature with making some changes to the LoadBalancer interface. 

I will update the design document with the changes I have mentioned. 
                
> 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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