Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/22085#discussion_r211359028
--- 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")))
+ // A call to accept() for ServerSocket shall block infinitely.
+ serverSocket.map(_.setSoTimeout(0))
+ new Thread("accept-connections") {
+ setDaemon(true)
+
+ override def run(): Unit = {
+ while (!serverSocket.get.isClosed()) {
+ var sock: Socket = null
+ try {
+ sock = serverSocket.get.accept()
+ sock.setSoTimeout(10000)
+ val cmdString = readUtf8(sock)
+ if (cmdString.equals("run")) {
+ sock.setSoTimeout(0)
+ barrierAndServe(sock)
+ }
+ } catch {
+ case _: SocketException =>
--- End diff --
Is the the timeout exception? I don't see any exception that we could
silently ignore.
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