Github user jiangxb1987 commented on a diff in the pull request: https://github.com/apache/spark/pull/22085#discussion_r209490553 --- Diff: core/src/main/scala/org/apache/spark/api/python/PythonRunner.scala --- @@ -180,7 +183,42 @@ private[spark] abstract class BasePythonRunner[IN, OUT]( dataOut.writeInt(partitionIndex) // Python version of driver PythonRDD.writeUTF(pythonVer, dataOut) + // Init a GatewayServer to port current BarrierTaskContext to Python side. + val isBarrier = context.isInstanceOf[BarrierTaskContext] + val secret = if (isBarrier) { + Utils.createSecret(env.conf) + } else { + "" + } + val gatewayServer: Option[GatewayServer] = if (isBarrier) { + Some(new GatewayServer.GatewayServerBuilder() + .entryPoint(context.asInstanceOf[BarrierTaskContext]) + .authToken(secret) + .javaPort(0) + .callbackClient(GatewayServer.DEFAULT_PYTHON_PORT, GatewayServer.defaultAddress(), + secret) + .build()) --- End diff -- We have to port `BarrierTaskContext` from java to python side, otherwise there is no way to call `BarrierTaskContext.barrier()` from python side. Thus, of course, the JavaGateway is only initiated when the context is a `BarrierTaskContext`.
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