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https://issues.apache.org/jira/browse/HBASE-20500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16456151#comment-16456151
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Ted Yu commented on HBASE-20500:
--------------------------------

There seems to be some typo in the error above.
Here is related code:
{code}
          throw new ConstraintException("Target RSGroup must have at least one 
server.");
{code}
Do you want to attach a patch ?

> [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
>
> 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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