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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Mon, 16 Mar 2015 07:24:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14362855#comment-14362855
] 

Lars Hofhansl commented on HBASE-6721:
--------------------------------------

Let me 2nd that. Many thanks to [~toffer], and also that some of the changes are very complex
and pretty invasive.
Even at Salesforce we do not worry too much cross tenant impact, we rather throw enough resources
at it and let HBase do the work, when we see issues we look into general fixes such as the
ones that [~eclark] mentions above.

Now, Yahoo is a big place with very large clusters and many users on those clusters. If the
need arises there for this kind of mulit tenancy, we'd better listen to them and to Francis,
before we decide this it not the right path forward.


> 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
>         Attachments: 6721-master-webUI.patch, HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf,
HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf, HBASE-6721_10.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_trunk.patch, HBASE-6721_trunk.patch,
HBASE-6721_trunk.patch, HBASE-6721_trunk1.patch, HBASE-6721_trunk2.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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