Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/9237#issuecomment-155250340
BTW, this is a simple code to demonstrate this issue:
```Scala
import java.net.{InetSocketAddress, ServerSocket}
class TestServer(host: String, port: Int) extends Thread {
setDaemon(true)
override def run(): Unit = {
println("listen to " + port)
val s = new ServerSocket()
val a = if (host == null) new InetSocketAddress(port) else new
InetSocketAddress(host, port)
s.bind(a)
while (true) {
val clientSocket = s.accept()
clientSocket.close()
}
}
}
object MultipleBindsToTheSamePort extends App {
new TestServer(null, 9000).start()
new TestServer("localhost", 9000).start()
Thread.sleep(30000)
}
```
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