Song Jiacheng created YARN-10786:
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             Summary: 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


The reason of this is that AM gets the proxy URI from config 
yarn.web-proxy.address, and it does not exist, it will gets 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:

<property>
 <name>yarn.web-proxy.address</name>
 <value>rm1:9088,rm2:9088</value>
</property>

And then gets the config with Configuration#getStrings.

So that I can access the AM page now



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