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https://issues.apache.org/jira/browse/HBASE-20500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16457697#comment-16457697
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Ted Yu commented on HBASE-20500:
--------------------------------

It seems there is no material difference between v3 and v4.

In this case, you can attach v3 again which would be run by QA bot.
Naming new patch v4 may give people impression that something has changed while 
that is not the case.

TestRSGroups may be flaky - investigation should be carried out to find the 
cause.

> [rsgroup] should keep at least one server in default group
> ----------------------------------------------------------
>
>                 Key: HBASE-20500
>                 URL: https://issues.apache.org/jira/browse/HBASE-20500
>             Project: HBase
>          Issue Type: Bug
>          Components: rsgroup
>    Affects Versions: 2.0.0-beta-2
>            Reporter: Yechao Chen
>            Assignee: Yechao Chen
>            Priority: Major
>         Attachments: HBASE-20500-branch-2.v1.patch, 
> HBASE-20500-master.v1.patch, HBASE-20500-master.v2.patch, 
> HBASE-20500-master.v3.patch, HBASE-20500-master.v4.patch
>
>
> we move all the servers from default group
> the default group will has  no servers,
> then we create a  new table ,
> it will failed case of the default group has no servers
> eorr info is :
> EROOR: ConstraintException:Target RSGroup must have at lease on server
>  
> we should keep at least one server in 'default' RSGroup
>  



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