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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6721) RegionServer Group based Assignment
Date Fri, 18 Sep 2015 18:26:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14876096#comment-14876096

Andrew Purtell commented on HBASE-6721:

bq. Andrew Purtell The new patch is based off of current master. Should we just replace the
current branch with a new branch to go with the new patch?

I would say so if you want it. 

bq. Also was wondering since this is now cp-based. Do we still need a branch?

Up to you. We can rebase or delete, either way let me know.  

Some issues with the current security integration. Coprocessors can't call into the internals
of other coprocessors. I understand why this was done, but we can't have it. Coprocessors
calling into the internals of other coprocessors, this is a non-negotiable point for the sake
of sanity in maintenance of separate optional extensions. It's a catch-22 imposed on this
change by the requirement it be a coprocessor only implementation.

What I would suggest is introduce into the MasterObserver API hooks for the group admin APIs.
Let the implementation of the group admin APIs and the authoritative security decisions both
be separate mix-ins provided by different coprocessors. There needs to be common plumbing
for the two. That belongs in MasterObserver. The plumbing could look like:
- MasterObserver support for pre/post group admin API action hooks
- In GroupAdminEndpoint, get the coprocessor host with getMasterCoprocessorHost()
- Invoke the public (technically, LimitedPrivate(COPROC)) APIs for pre/post group admin API

This is much more in spirit with current interfaces and audience scoping. It also addresses
concerns about zero impact in the default case. Those upcalls will never be made unless the
GroupAdminEndpoint is installed.

> 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: Francis Liu
>              Labels: hbase-6721
>         Attachments: 6721-master-webUI.patch, HBASE-6721 GroupBasedLoadBalancer Sequence
Diagram.xml, HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf, HBASE-6721-DesigDoc.pdf,
HBASE-6721_0.98_2.patch, HBASE-6721_10.patch, HBASE-6721_11.patch, HBASE-6721_12.patch, HBASE-6721_13.patch,
HBASE-6721_14.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_98_1.patch, HBASE-6721_98_2.patch, HBASE-6721_hbase-6721_addendum.patch, HBASE-6721_trunk.patch,
HBASE-6721_trunk.patch, HBASE-6721_trunk.patch, HBASE-6721_trunk1.patch, HBASE-6721_trunk2.patch,
balanceCluster Sequence Diagram.svg, immediateAssignments Sequence Diagram.svg, randomAssignment
Sequence Diagram.svg, retainAssignment Sequence Diagram.svg, roundRobinAssignment Sequence
> 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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