Github user mengxr commented on a diff in the pull request: https://github.com/apache/spark/pull/22085#discussion_r211357983 --- Diff: core/src/main/scala/org/apache/spark/api/python/PythonRunner.scala --- @@ -180,7 +190,61 @@ 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(0, 1, InetAddress.getByName("localhost"))) --- End diff -- minor: useful to add `/* port */` and `/* backlog */`
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