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https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576806#comment-13576806
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Andrew Purtell commented on HBASE-6721:
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bq. With this, master, zk and META are still shared across different groups
with little isolation guarantees or SLAs. I am wondering whether this is worth
the effort without having proper multi-tenancy at all levels.
I agree with this, but in defense of Francis' approach here, HDFS is also
shared (though it helps that writes prefer the local datanode, as do shortcut
reads). Admission control / QoS is a hard problem that requires a full stack
conversation and, in my opinion, calls for considering a framework for
admission control spanning from Common outward, something similar to a security
access token (perhaps even an attribute of same) with support at each layer for
mapping a logical notion of priority or quota to the actual enforcement
mechanism, whatever it is. That will be a difficult project to say the least
and in the meantime we could make incremental improvements at various layers of
the stack if there is a demonstrated benefit.
> 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_3.patch,
> HBASE-6721_94_3.patch, HBASE-6721_94_4.patch, HBASE-6721_94_5.patch,
> HBASE-6721_94_6.patch, HBASE-6721_94_7.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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