Xiang Li commented on HBASE-20133:

Thanks [~yuzhih...@gmail.com] for the comments!
1. Regarding
bq. BTW why is this JIRA critical ? The change is just some refactoring.
Sorry. Change it into "Minor"

2. Regarding
bq. Have you considered using tuple as return value ? It seems to be clearer 
that way.
Almost got your idea. But does Java support tuple? I think it needs to 
implement a simple tuple class or use a third-party library, like 
org.apache.commons.lang3.tuple.Pair? Do you mean to do it that way? Just wonder 
if it worths it (use only once for a return of a function)
Please correct me if I get it wrong.

> 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: Minor
>         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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