Xiang Li commented on HBASE-20133:

Uploaded patch 000 for review.
# correctAssignments() is updated to calculate correct assignment as well as 
RegionPlan for mis-placed regions. correct assignment is returned by return 
value, while RegionPlan is returned by the input parameter
# findServerForRegion could be removed. By the way, I think the following code 
    throw new IllegalStateException("Could not find server for region "
        + region.getShortNameToLog());
could not be reached so no similar logic is add after the change.

> 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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