Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/318#issuecomment-39648238
Hey I thought about this some more. I think that it might make more sense
in the short term to just do what this is doing, revert to binding the UI to
all interfaces.
Doing a broader clean-up of the way we infer and bind to hostnames may not
be in scope for 1.0 and I'd rather avoid the reversion here. So @kanzhang if
you make the change @andrewor14 maybe we can just merge this. We'll need to
document clearly that `SPARK_LOCAL_IP` is only used for internal communications
(e.g. Akka actors) and that the UI binds to all interfaces at present.
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