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https://issues.apache.org/jira/browse/HBASE-20997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16568455#comment-16568455
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huaxiang sun commented on HBASE-20997:
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Add steps about how to reproduce this issue manually.
1. Spawn a cluster with two masters.
2. Create a table with region replica >= 2.
3. failover the active master.
4. Split the table from shell.
5. Check the RS hosting replica parent region. The replica parent region is not
offlined at the RS.
> 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
>
>
> 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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