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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Mon, 17 Aug 2015 18:58:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14700035#comment-14700035
] 

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

{quote}
bq. The tool says hbase-6721-0.98 is 100% binary compatible with 0.98.13, with some source
level incompatibility of mild concern in the MasterObserver interface.
This is prolly because of the new methods this patch adds to the interface. This shouldn't
be a concern then?
{quote}
Yes, it will be a concern for things like Apache Phoenix. (See their IndexMasterObserver,
etc.) We can handle this by using compatibility helpers that won't attempt to invoke the new
APIs on MasterObservers that do not implement them. We do something like this in WALCoprocessorHost.


> 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_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_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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