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https://issues.apache.org/jira/browse/HBASE-18575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HBASE-18575 started by Umesh Agashe.
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> [AMv2] Enable and fix TestRestartCluster#testRetainAssignmentOnRestart on
> master
> --------------------------------------------------------------------------------
>
> Key: HBASE-18575
> URL: https://issues.apache.org/jira/browse/HBASE-18575
> Project: HBase
> Issue Type: Bug
> Components: amv2
> Affects Versions: 2.0.0
> Reporter: Umesh Agashe
> Assignee: Umesh Agashe
> Priority: Critical
> Fix For: 2.0.0
>
>
> * Test creates 3 node cluster (master + 2 RS) and creates 3 tables with 1
> region each.
> * It then takes a snapshot of region assignments
> * Shuts down the cluster and restarts with 4 nodes (2 RS on same ports, 1 RS
> on port where master was running previously and master on new port)
> * Takes snapshot of region assignments
> * Expected behavior is regions will be retained on RS with appropriate ports
> Debugging done so far shows that, when cluster is restarted meta is loaded
> but meta has old entries (though the ports are same for RSs, start timestamps
> are different). AssignmentManager#processofflineServersWithOnlineRegions()
> finds that old RS with different timestamps are not online even though
> regions assigned to them are online; triggering submitting SCP for each those
> RSs. Subprocedure AssignProcedure of SCP has forceNewPlan set to true. Which
> triggers re-assignment of regions.
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