Steve Loughran commented on YARN-1946:

This has got more complex with the HA proxy stuff: there's >1 (host,port) pair 
and the caller needs to handle failover.

its still something that could be made public for anyone wanting to do their 
own AmIPFilter; they'd just need to add failover logic themselves

> need Public interface for WebAppUtils.getProxyHostAndPort
> ---------------------------------------------------------
>                 Key: YARN-1946
>                 URL: https://issues.apache.org/jira/browse/YARN-1946
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api, webapp
>    Affects Versions: 2.4.0
>            Reporter: Thomas Graves
>            Priority: Critical
> ApplicationMasters are supposed to go through the ResourceManager web app 
> proxy if they have web UI's so they are properly secured.  There is currently 
> no public interface for Application Masters to conveniently get the proxy 
> host and port.  There is a function in WebAppUtils, but that class is 
> private.  
> We should provide this as a utility since any properly written AM will need 
> to do this.

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