Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/5060#issuecomment-96460443
Hi @tdas , I agree with you that only port in enough, no need to track the
host. But we could only save the port when user explicitly set it. Port number
0 will not be stayed after `SparkEnv` is initialized, as you see
[here](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/SparkEnv.scala#L250),
so we shouldn't save this port number (which is set by `SparkEnv`).
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