Wangda Tan commented on YARN-2800:

Hi [~ozawa], 
Thanks for your comments,
bq. MemoryRMNodeLabelsManager for tests do nothing in new patch. How about 
renaming MemoryRMNodeLabelsManager to NullRMNodeLabelsManager for the 
consistency with RMStateStore?

bq. Maybe not related to this JIRA, but it's better to add testing RMRestart 
with NodeLabelManager to avoid regressions.
Agree, filed YARN-2880 to track this,

Uploaded a new patch,


> 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
> 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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