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From "Francis Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Fri, 20 Mar 2015 23:30:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14372314#comment-14372314
] 

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

Thanks for the interest and attention guys. I'll put up a seed list of pros and cons over
the weekend. And we can hammer out concerns there.  

Similar to namespaces, regionserver groups can actually be enabled by default and existing
users wouldn't notice any difference (except for the extra table that needs to be assigned).
Unless they actually use it (similar to namespaces). 

FWIW I believe this feature is useful even for small clusters as long as you have a variation
of tenants (or just misbehaving tenants). There are bunch of scenarios that need protection/isolation/QoS.
ie cascading failures caused by a tenant, block cache thrashing, different configurations
(ie GC configs), different requirements. This becomes even more important in a mixed workload
environment (MR, storm, etc).  


> 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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