Phil Zampino commented on KNOX-1244:

Until YARNUIV2 requests return the redirect status codes when the standby 
endpoint is accessed, Knox can't know to "failover" to the active endpoint.

> YARNUIV2 support requires a custom dispatch to handle redirects from passive 
> to active endpoint
> -----------------------------------------------------------------------------------------------
>                 Key: KNOX-1244
>                 URL: https://issues.apache.org/jira/browse/KNOX-1244
>             Project: Apache Knox
>          Issue Type: Bug
>          Components: Server
>    Affects Versions: 1.1.0
>            Reporter: Phil Zampino
>            Assignee: Phil Zampino
>            Priority: Major
>             Fix For: 1.1.0
> If discovery queries the YARN config to identify the endpoint for the new 
> YARNUIV2 service, it may find that the configured value is actually the 
> standby endpoint. interactions with this endpoint yield a redirect notice, 
> which needs to be handled in exactly the same way as is done for the 
> RESOURCEMANAGER (RMHaDispatch) and YARNUI (RMUIHaDispatch) services.
> The RMUIHaDispatch may be able to be leveraged directly or extended.

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