Steve Loughran commented on YARN-1143:

I don't think we need to do this except for the special case of apps that want 
to be listed in the registry. Even there, the fact that you can't impose any 
restrictions on usernames implies that 
# punycoding will be needed to convert usernames to DNS standard names.
# the standard DNS limit on 63 chars will have to be ignored.

> Restrict the names that apps and types can have
> -----------------------------------------------
>                 Key: YARN-1143
>                 URL: https://issues.apache.org/jira/browse/YARN-1143
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.1.0-beta
>            Reporter: Steve Loughran
>            Priority: Minor
> YARN-1001 is an example of a RESTy API to the RM's list of apps and app types 
> -and it shows that we may want to add some restrictions on the characters 
> allowed in an app name or type (or at least forbid some) -before it is too 
> late.
> If we don't do that, then tests should verify that you can have apps with 
> high-unicode names as well as other troublesome characters

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