Tsuyoshi OZAWA commented on YARN-2800:

Vinod, OK, let's discuss the design of state management of NodeLabelsManager on 
YARN-796 or another JIRA.

[~leftnoteasy] currently, I still think it's enough to log at startup time once 
and showing what kind of RMNodeLabelsManager is used on Web UI. The problem you 
mentioned after RM restart looks design issue of label management. We should 
fix it on another JIRA. Please correct me if I'm wrong.

> Should print WARN log in both RM/RMAdminCLI side when 
> MemoryRMNodeLabelsManager is enabled
> ------------------------------------------------------------------------------------------
>                 Key: YARN-2800
>                 URL: https://issues.apache.org/jira/browse/YARN-2800
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: client, resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-2800-20141102-1.patch, YARN-2800-20141102-2.patch
> Even though we have documented this, but it will be better to explicitly 
> print a message in both RM/RMAdminCLI side to explicitly say that the node 
> label being added will be lost across RM restart.

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