huaxiang sun created HBASE-20997:
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             Summary: rebuildUserRegions() does not build ReplicaMapping during 
master switchover
                 Key: HBASE-20997
                 URL: https://issues.apache.org/jira/browse/HBASE-20997
             Project: HBase
          Issue Type: Bug
          Components: master
    Affects Versions: 1.4.6, 1.3.2, 1.2.6, 1.5.0
            Reporter: huaxiang sun
            Assignee: huaxiang sun


During master switchover, rebuildUserRegions() does not rebuild master 
in-memory defaultReplicaToOtherReplicas map. This puts the cluster in an 
inconsistent state. In read replica case, it causes replica parent region stay 
online without being unassigned.



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