[jira] [Commented] (KNOX-1244) YARNUIV2 support requires a custom dispatch to handle redirects from passive to active endpoint

["Phil Zampino (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KNOX-1244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16432383#comment-16432383 ] 

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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