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https://issues.apache.org/jira/browse/YARN-10786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17350861#comment-17350861
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Qi Zhu commented on YARN-10786:
-------------------------------

Thanks [~Song Jiacheng] for report this.

Can you add some image to confirm your patch will fix this?
 # Before this patch.
 # After this patch.

> Federation:We can't access the AM page while using federation
> -------------------------------------------------------------
>
>                 Key: YARN-10786
>                 URL: https://issues.apache.org/jira/browse/YARN-10786
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: federation
>    Affects Versions: 3.2.1
>            Reporter: Song Jiacheng
>            Priority: Major
>              Labels: federation
>             Fix For: 3.2.1
>
>         Attachments: YARN-10786.v1.patch
>
>
> The reason of this is that AM gets the proxy URI from config 
> yarn.web-proxy.address, and if it does not exist, it will get the URI from 
> yarn.resourcemanager.webapp.address.
> But in federation, we don't know which RM will be the home cluster of an 
> application, so I do this fix:
> 1. Add this config in the yarn-site.xml on client.
> <property>
>  <name>yarn.web-proxy.address</name>
>  <value>rm1:9088,rm2:9088</value>
>  </property>
> 2. Change the way to get the config from Configuration#get to 
> Configuration#getStrings in WebAppUtils#getProxyHostsAndPortsForAmFilter.
> So that I can access the AM page now.
> This config need to be added in the client side, so it will affect 
> application only.



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