Xiang Li updated HBASE-20133:
    Status: Patch Available  (was: Open)

> Calculate correct assignment and build region movement plans for mis-placed 
> regions in one pass
> -----------------------------------------------------------------------------------------------
>                 Key: HBASE-20133
>                 URL: https://issues.apache.org/jira/browse/HBASE-20133
>             Project: HBase
>          Issue Type: Improvement
>          Components: rsgroup
>            Reporter: Xiang Li
>            Assignee: Xiang Li
>            Priority: Critical
>         Attachments: HBASE-20133.master.000.patch
> In RSGroupBasedLoadBalancer#balanceCluster(clusterState), the logic could be 
> improved:
> correctAssignment() builds a map for mis-placed and placed regions. For 
> mis-placed regions, the key(ServerName) is BOGUS_SERVER_NAME. Then the logic 
> gets those mis-paced regions out and calls findServerForRegion() several 
> times to find out the current host server, in order to build RegionPlan for 
> movement.
> Some logic in correctAssignment() and findServerForRegion() could be merged 
> so as to build both corrected assignment and RegionPlan for mis-placed region 
> in one pass. As a result, findServerForRegion() could be removed if I get it 
> correctly.

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