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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Fri, 12 Feb 2016 20:39:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15145253#comment-15145253
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Matteo Bertozzi commented on HBASE-6721:
----------------------------------------

just gave a look at the patch. most of the code seems isolated. 
the client is separate from Admin with its own GroupAdmin
the rpc is not in the master but in its own GroupAdminEndpoint
the "group assignment" logic seems isolated in GroupBasedLoadBalancer
and there are not many changes to the core. 

The only "big" thing that should be fixed are that too generic Group name and maybe doing
something around that processBogusAssignments()/BOGUS_SERVER_NAME

moving in its own module seems easy since most of the code is already isolated, but there
are few things that we never done, like having the shell commands in a module different than
hbase-shell

> 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_13.patch,
HBASE-6721_14.patch, HBASE-6721_15.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, hbase-6721-v15-branch-1.1.patch, hbase-6721-v16.patch,
hbase-6721-v17.patch, hbase-6721-v18.patch, hbase-6721-v19.patch, hbase-6721-v20.patch, hbase-6721-v21.patch,
hbase-6721-v22.patch, hbase-6721-v23.patch, hbase-6721-v25.patch, 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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