Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/13950
> I can add info about app UI not being accessible directly when reverse
proxy is enabled in the documentation, so users do know about this.
I think that's the bare minimum, since users might be surprised by the
behavior. As for the behavior itself, it seems inline with the goal of the
patch (where users wouldn't have direct access to the app's UI, only through
the master). But one thing is that it requires both the master and all the
applications to share that config - and that needs to be clearly documented. In
cluster mode, it would even be nice if the master / worker daemons set that
config when launching the app.
The YARN code is in `ApplicationMaster` (look for `def addAmIpFilter`). But
that relies on a YARN class that might not be available to the master / worker
daemons, so you can't really use it here.
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