Github user WangTaoTheTonic commented on the pull request:
https://github.com/apache/spark/pull/4505#issuecomment-75891305
Assume that machines in our cluster have two network interfaces, one is
used for management mainly while the other is used for business. Spark is the
only one of many components and we just wanna access its Web UI via one of the
network interfaces. That makes configurable ip address necessary.
Most configuration could be assigned with a wrong value, it will be ok as
long as we give an error prompt when user configure it improperly.
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