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https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14720933#comment-14720933
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Elliott Clark commented on HBASE-6721:
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bq.Maybe you can elaborate on this point?
Sure let me write up something more on that point.
bq.Let's not let the perfect be the enemy of the good.
I'm not asking for perfect. I'm asking not to take a half step back for most
users so that one user can merge this feature and take a single step forward.
bq.Meanwhile we have a patch on deck and we need to be evaluating it and its
contributor's concerns on their merit.
Yeah and I have evaluated it and used my knowledge and judgement and cast my
vote on this patch and feature in accordance with the Apache Foundation rules
(http://www.apache.org/foundation/voting.html#votes-on-code-modification) . I
have added my technical reasons. I have even outlined what I would need to vote
a different way.
bq. the 0.90 master rewrite (remember that?)
Yeah that has since proved to be the wrong way to go. It put way too much in ZK
and now we've spent years un-doing it. We would have been better served with
asking for parts to be pluggable and not on by default.
bq.or the memcache-based block cache carried
That followed the exact same bar that I'm requesting here. No added complexity
on the default use case. I've even moved it into a different module so that it
will be exactly what I'm asking for here.
> 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: Francis Liu
> Labels: hbase-6721
> Attachments: 6721-master-webUI.patch, HBASE-6721
> GroupBasedLoadBalancer Sequence Diagram.xml, HBASE-6721-DesigDoc.pdf,
> HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf,
> HBASE-6721_0.98_2.patch, HBASE-6721_10.patch, HBASE-6721_11.patch,
> HBASE-6721_12.patch, HBASE-6721_8.patch, HBASE-6721_9.patch,
> HBASE-6721_9.patch, HBASE-6721_94.patch, HBASE-6721_94.patch,
> 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_98_1.patch, HBASE-6721_98_2.patch,
> HBASE-6721_hbase-6721_addendum.patch, HBASE-6721_trunk.patch,
> HBASE-6721_trunk.patch, HBASE-6721_trunk.patch, HBASE-6721_trunk1.patch,
> HBASE-6721_trunk2.patch, balanceCluster Sequence Diagram.svg,
> immediateAssignments Sequence Diagram.svg, randomAssignment Sequence
> Diagram.svg, retainAssignment Sequence Diagram.svg, roundRobinAssignment
> Sequence Diagram.svg
>
>
> 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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