Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/22085#discussion_r209464515
--- 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())
+ } else {
+ None
+ }
+ gatewayServer.map(_.start())
+ gatewayServer.foreach { server =>
+ context.addTaskCompletionListener(_ => server.shutdown())
+ }
+ val boundPort: Int =
gatewayServer.map(_.getListeningPort).getOrElse(0)
+ if (boundPort == -1) {
+ val message = "GatewayServer to port BarrierTaskContext failed
to bind to Java side."
+ logError(message)
+ throw new SparkException(message)
+ } else {
+ logDebug(s"Started GatewayServer to port BarrierTaskContext on
port $boundPort.")
--- End diff --
When `isBarrier` is false, I think we don't need show this?
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