Daniel Templeton commented on YARN-4767:

The javadoc complaints are all about the fact that {{_}} is used as a variable 
name.  I'd really love to fix that, but it's way out of scope for this patch.

> Network issues can cause persistent RM UI outage
> ------------------------------------------------
>                 Key: YARN-4767
>                 URL: https://issues.apache.org/jira/browse/YARN-4767
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: webapp
>    Affects Versions: 2.7.2
>            Reporter: Daniel Templeton
>            Assignee: Daniel Templeton
>            Priority: Critical
>         Attachments: YARN-4767.001.patch, YARN-4767.002.patch, 
> YARN-4767.003.patch, YARN-4767.004.patch, YARN-4767.005.patch, 
> YARN-4767.006.patch, YARN-4767.007.patch, YARN-4767.008.patch, 
> YARN-4767.009.patch, YARN-4767.010.patch
> If a network issue causes an AM web app to resolve the RM proxy's address to 
> something other than what's listed in the allowed proxies list, the 
> AmIpFilter will 302 redirect the RM proxy's request back to the RM proxy.  
> The RM proxy will then consume all available handler threads connecting to 
> itself over and over, resulting in an outage of the web UI.

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