Duo Zhang created HBASE-23006:

             Summary: RSGroupBasedLoadBalancer should also try to place 
replicas for the same region to different region servers
                 Key: HBASE-23006
                 URL: https://issues.apache.org/jira/browse/HBASE-23006
             Project: HBase
          Issue Type: Bug
          Components: Region Assignment, rsgroup
            Reporter: Duo Zhang

Found this when implementing HBASE-22971. TestSCPWithReplicas fails when 
RSGroupBasedLoadBalancer is enabled.

And this can be reproduced by a UT on master branch too. I think the problem is 
that in RSGroupBasedLoadBalancer.retainAssignment we do not consider region 

We should fix this.

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