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From "Francis Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Wed, 24 Oct 2012 18:50:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13483464#comment-13483464
] 

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

[~yuzhihong@gmail.com]

{quote}
What does the value in serversInTransition map represent?
{quote}

It represents servers that are being moved from one group to another.

{quote}
Can you tell me what the body is supposed to achieve ?
Back to GroupAdminEndpoint:
{quote}

Retrieveing the balancer during start() returns null. Thus I have to retrieve it lazily as
needed.

{quote}
Does GroupInfoManager belong to balancer ? The above is probably the longest indirection I
have ever seen
{quote}

We had to do this since we didn't want to touch AssignmentManager as much as possible :)


                
> 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.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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