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https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14699179#comment-14699179
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Francis Liu commented on HBASE-6721:
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{quote}
I ran the binary compatibility checker tool comparing hbase-6721-0.98 with
0.98.13. 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.
{quote}
This is prolly because of the new methods this patch adds to the interface.
This shouldn't be a concern then?
{quote}
Do we need GroupAdmin and GroupAdminClient now? A hold over from an initial
coprocessor based implementation?
{quote}
This was based on review comments from [~enis] tho I'm not sure if the comment
still stands post-cp implementation. I am fine either way. Should this be in
HBaseAdmin then?
https://reviews.apache.org/r/27673/diff/2?file=751817#file751817line52
https://reviews.apache.org/r/27673/diff/2?file=751816#file751816line35
> 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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