Jason Lowe commented on YARN-4365:

+1 latest patch lgtm.  Committing this.

> FileSystemNodeLabelStore should check for root dir existence on startup
> -----------------------------------------------------------------------
>                 Key: YARN-4365
>                 URL: https://issues.apache.org/jira/browse/YARN-4365
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.7.2
>            Reporter: Jason Lowe
>            Assignee: Kuhu Shukla
>         Attachments: YARN-4365-1.patch, YARN-4365-2.patch, YARN-4365-3.patch
> If the namenode is in safe mode for some reason then FileSystemNodeLabelStore 
> will prevent the RM from starting since it unconditionally tries to create 
> the root directory for the label store.  If the root directory already exists 
> and no labels are changing then we shouldn't prevent the RM from starting 
> even if the namenode is in safe mode.

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