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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Thu, 25 Oct 2012 01:26:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13483801#comment-13483801

Elliott Clark commented on HBASE-6721:

{quote}Did you apply the patches attached in the subtasks prior to apply this patch? If you'd
like them all in one single patch I can do that as well.{quote}
Nope I had missed those.

{quote}As part of the design, HBase should run fine without the group based classes enabled
(endpoint, balancer, etc).{quote}
Then they should be a seperate module.  This half in half removable part is just a little

{quote}The balancer is still pluggable it's just not pluggable for the GroupBasedLoadBalancer{quote}
If this is going to be a feature then it will need to work with all balancers.

{quote}I see, were do you suggest we put it? Zookeeper? We mainly had it in HDFS since ZK,
seemed to be the place to store only ephemeral data? Putting the data in tables would be a
lot more complex and would require more core code change.{quote}

I would prefer something like security has.  We have a perfectly usable key/value storage
system no need to use a different storage path.

> 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

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