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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:
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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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