Mingliang Liu updated HDFS-11008:
    Attachment: HDFS-11008.000.patch

[~szetszwo] Could you kindly review? Thanks.

> Add unit test for parsing "-source" parameter in Balancer tool
> --------------------------------------------------------------
>                 Key: HDFS-11008
>                 URL: https://issues.apache.org/jira/browse/HDFS-11008
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: test
>            Reporter: Mingliang Liu
>            Assignee: Mingliang Liu
>         Attachments: HDFS-11008.000.patch
> [HDFS-8826] added an option to specify the source node list so that balancer 
> only selects blocks to move from those nodes. This is very efficient in some 
> cases.
> The unit test of {{-source}} option parsing is missing, for both valid and 
> invalid cases. This JIRA is to track the effort of adding unit test for that. 
> In fact, we can refactor the existing code by replacing code that manually 
> creates {{BalancerParameters}} with new code that explores the 
> {{Balancer$Cli#parse()}}.

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