Wangda Tan updated YARN-2800:
    Attachment: YARN-2800-20141205-1.patch

Fixed UT failures.

> Remove MemoryNodeLabelsStore and add a way to enable/disable node labels 
> feature
> --------------------------------------------------------------------------------
>                 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, 
> YARN-2800-20141118-1.patch, YARN-2800-20141118-2.patch, 
> YARN-2800-20141119-1.patch, YARN-2800-20141203-1.patch, 
> YARN-2800-20141205-1.patch
> In the past, we have a MemoryNodeLabelStore, mostly for user to try this 
> feature without configuring where to store node labels on file system. It 
> seems convenient for user to try this, but actually it causes some bad use 
> experience. User may add/remove labels, and edit capacity-scheduler.xml. 
> After RM restart, labels will gone, (we store it in mem). And RM cannot get 
> started if we have some queue uses labels, and the labels don't exist in 
> cluster.
> As what we discussed, we should have an explicitly way to let user specify if 
> he/she wants this feature or not. If node label is disabled, any operations 
> trying to modify/use node labels will throw exception.

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