Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/20519#discussion_r167014593 --- Diff: core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala --- @@ -180,18 +181,52 @@ private[spark] class PythonWorkerFactory(pythonExec: String, envVars: Map[String return } + var serverSocket: ServerSocket = null try { + // get a server socket so that the launched daemon can tell us its server port + serverSocket = new ServerSocket(0, 0, InetAddress.getByAddress(Array(127, 0, 0, 1))) --- End diff -- not sure it makes a difference here, but it's generally a good idea to call `setReuseAddress(true)`.
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