Steve Loughran commented on YARN-3368:

This relates to YARN-2031 & having full REST access to AMs. currently when some 
conditions are met (e.g. client attempting to GET from an AM that is still to 
launch, or completed) the RM proxy redirects to human-centric error pages, 
which confuses REST client apps.

If there was a REST view, it'd be good to hook up (or at least have an option 
to) REST clients in a way which provided meaningful HTTP error codes in such 
situations, rather than just HTML text

> Improve YARN web UI
> -------------------
>                 Key: YARN-3368
>                 URL: https://issues.apache.org/jira/browse/YARN-3368
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Jian He
> The goal is to improve YARN UI for better usability.
> We may take advantage of some existing front-end frameworks to build a 
> fancier, easier-to-use UI. 
> The old UI continue to exist until  we feel it's ready to flip to the new UI.
> This serves as an umbrella jira to track the tasks. we can do this in a 
> branch.

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