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https://issues.apache.org/jira/browse/HBASE-20595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479450#comment-16479450
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Andrew Purtell edited comment on HBASE-20595 at 5/17/18 5:49 PM:
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bq. we'll probably need to document "can't turn on rsgroup feature" as a 
limitation of single-node deployments.

Ah, no, better that the constraint that system tables cannot be placed into the 
same rsgroup as user tables be what is optional, and allow single node 
deployments to put everything into "default"



was (Author: apurtell):
bq. we'll probably need to document "can't turn on rsgroup feature" as a 
limitation of single-node deployments.

Ah, no, better that the constraint that system tables cannot be placed into the 
same rsgroup as user tables be what is optional.


> Remove the concept of 'special tables' from rsgroups
> ----------------------------------------------------
>
>                 Key: HBASE-20595
>                 URL: https://issues.apache.org/jira/browse/HBASE-20595
>             Project: HBase
>          Issue Type: Task
>          Components: Region Assignment, rsgroup
>            Reporter: Andrew Purtell
>            Priority: Major
>             Fix For: 3.0.0, 2.1.0, 1.5.0
>
>
> Regionserver groups needs to specially handle what it calls "special tables", 
> tables upon which core or other modular functionality depends. They need to 
> be excluded from normal rsgroup processing during bootstrap to avoid circular 
> dependencies or errors due to insufficiently initialized state. I think we 
> also want to ensure that such tables are always given a rsgroup assignment 
> with nonzero servers. (IIRC another issue already raises that point, we can 
> link it later.)
> Special tables include:
> * The system tables in the 'hbase:' namespace
> * The ACL table if the AccessController coprocessor is installed
> * The Labels table if the VisibilityController coprocessor is installed
> * The Quotas table if the FS quotas feature is active
> Either we need a facility where "special tables" can be registered, which 
> should be in core. Or, we institute a blanket rule that core and all 
> extensions that need a "special table" must put them into the 'hbase:' 
> namespace, so the TableName#isSystemTable() test will return TRUE for all, 
> and then rsgroups simply needs to test for that.



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