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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Fri, 16 Aug 2013 03:45:55 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13741866#comment-13741866
] 

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

The current state of this issue is confusing. The parent is in 'Patch Available' state but
seems stale. Subtask #3 has been committed to trunk/0.96 and 0.94. Other subtasks are resolved
as 'Invalid'. We should at least have a release note describing what is going to be in 0.96
(and already in 0.94). What further work is going to be done here? What been abandoned? Has
enough functionality been committed already to address the contributors' use case? Did something
turn out to be problematic? Nothing more for 0.96 since [~stack] has frozen 0.95, correct?
Nothing more need in 0.96 to support placing tables on certain regionservers only (will help
with 0.96 to 0.98 migration story)? I can research the answers to my questions in commit history
but maybe we can get an authoritative answer from [~avandana] or [~toffer]?
                
> 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: Vandana Ayyalasomayajula
>             Fix For: 0.96.0
>
>         Attachments: 6721-master-webUI.patch, HBASE-6721_10.patch, HBASE-6721_8.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_94.patch,
HBASE-6721_94.patch, HBASE-6721_9.patch, HBASE-6721_9.patch, HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf,
HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf, HBASE-6721_trunk.patch, HBASE-6721_trunk.patch,
HBASE-6721_trunk.patch
>
>
> 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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