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https://issues.apache.org/jira/browse/HBASE-20997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16567561#comment-16567561
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huaxiang sun commented on HBASE-20997:
--------------------------------------

I will go back to check if it applies to master branch, focusing on a branch-1 
fix first.

> 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: 1.2.6, 1.3.2, 1.5.0, 1.4.6
>            Reporter: huaxiang sun
>            Assignee: huaxiang sun
>            Priority: Major
>
> 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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