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https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490504#comment-13490504
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Francis Liu commented on HBASE-6721:
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{quote}
This stuff should all be pulled out into a separate package that can be put
into a Maven module like done with security in 0.94.
{quote}
Isn't that a bit too much overhead? Wasn't the reason security was a separate
module was because it had to depend on a secure version of hadoop which the
community didn't want?
{quote}
What changes to core code remain after that?
{quote}
I've updated the patch, there should be minimal and no invasive changes.
{quote}
Right, so you could assign ROOT, META, and the "group" table randomly at first,
and then calculate placement and moves of the rest and perhaps also META and
"group" after the "group" table becomes available, right? Worst case that would
be 3 moves?
{quote}
Since we are not doing any changes to the assignment manager this actually is
complicated since we won't really know what state assignment is in based on
just calls to the load balancer and information we can glean through the master
services.
> 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-5498_94_4.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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