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https://issues.apache.org/jira/browse/HBASE-20997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16568777#comment-16568777
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John Leach commented on HBASE-20997:
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[~huaxiang]Have you started writing the tests?
> 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
> Attachments: HBASE-20997-branch-1-v1.patch,
> HBASE-20997-branch-1-v2.patch
>
>
> 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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