Masatake Iwasaki commented on YARN-3711:

Though {{HAUtil.verifyAndSetConfiguration}} updates the configuration for HA on 
RM node, it only cares the rm-id of the node. AMs running on slave nodes need 
to know webapp addresses of all RMs. The URL of application shown in RM UI 
refers to wrong host name without explicit definition of webapp addresses.

> Documentation of ResourceManager HA should explain about webapp address 
> configuration
> -------------------------------------------------------------------------------------
>                 Key: YARN-3711
>                 URL: https://issues.apache.org/jira/browse/YARN-3711
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: documentation
>            Reporter: Masatake Iwasaki
>            Assignee: Masatake Iwasaki
>            Priority: Minor
>         Attachments: YARN-3711.002.patch
> There should be explanation about webapp address in addition to RPC address.
> AM proxy filter needs explicit definition of 
> {{yarn.resourcemanager.webapp.address._rm-id_}} and/or 
> {{yarn.resourcemanager.webapp.https.address._rm-id_}} to get proper addresses 
> in RM-HA mode.

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