Github user squito commented on a diff in the pull request: https://github.com/apache/spark/pull/22085#discussion_r213060868 --- Diff: core/src/main/scala/org/apache/spark/api/python/PythonRunner.scala --- @@ -180,7 +188,73 @@ private[spark] abstract class BasePythonRunner[IN, OUT]( dataOut.writeInt(partitionIndex) // Python version of driver PythonRDD.writeUTF(pythonVer, dataOut) + // Init a ServerSocket to accept method calls from Python side. + val isBarrier = context.isInstanceOf[BarrierTaskContext] + if (isBarrier) { + serverSocket = Some(new ServerSocket(/* port */ 0, + /* backlog */ 1, + InetAddress.getByName("localhost"))) + // A call to accept() for ServerSocket shall block infinitely. + serverSocket.map(_.setSoTimeout(0)) + new Thread("accept-connections") { + setDaemon(true) + + override def run(): Unit = { + while (!serverSocket.get.isClosed()) { + var sock: Socket = null + try { + sock = serverSocket.get.accept() + // Wait for function call from python side. + sock.setSoTimeout(10000) + val input = new DataInputStream(sock.getInputStream()) --- End diff -- ok I'm doing this -- SPARK-25253, will open a pr shortly
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