Wangda Tan commented on YARN-2504:

an empty response of RPC protocol is as same as "void" of a Java method. And 
any exception thrown will be wrapped as YarnException so client can get it.

> Support get/add/remove/change labels in RM admin CLI 
> -----------------------------------------------------
>                 Key: YARN-2504
>                 URL: https://issues.apache.org/jira/browse/YARN-2504
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-2504-20141015-1.patch, YARN-2504.patch

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