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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