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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Fri, 28 Aug 2015 19:28:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14720440#comment-14720440
] 

Andrew Purtell commented on HBASE-6721:
---------------------------------------

Agreed we should evaluate these changes on their own merit. 

No core changes at all isn't a reasonable precondition because even with implementing as a
coprocessor based feature we'd need new hooks. Those hooks would touch the same places. IMHO
implementing as a coprocessor based feature makes little sense given the relatively small
changes needed. it would unnecessarily pollute our space of admin APIs and shell commands
with seperate APIs for optional feature like we have with security. 

Agreed the ops impact should be totally optional. Where these changes modify existing function
it's reasonable to make sure the modified behavior all sits behind configuration based conditionals.


> 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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