Umesh Agashe created HBASE-18575:

             Summary: [AMv2] Enable and fix 
TestRestartCluster#testRetainAssignmentOnRestart on master
                 Key: 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. This trigger 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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