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From "Francis Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Wed, 07 Nov 2012 20:04:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492658#comment-13492658
] 

Francis Liu commented on HBASE-6721:
------------------------------------

{quote}
Have you also considered adding a state mirror in ZK to avoid the need for random assignment
of catalog tables and the group table if it is available on (re)start?
{quote}
I'm wondering if it's worth the added complexity it introduces. For security it was needed
since consumers of acl data was distributed and zk could do the orchestration. But in this
case the data is only read and written to by the active master which to me makes mirroring
things in ZK more of an enhancement. I don't feel strongly about it but I'm more inclined
to keep things simple for now and see how things go. Thoughts?
                
> 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: HBASE-6721_94_2.patch, HBASE-6721_94_3.patch, HBASE-6721_94_3.patch,
HBASE-6721_94.patch, HBASE-6721_94.patch, HBASE-6721-DesigDoc.pdf
>
>
> 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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