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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