Github user dbtsai commented on a diff in the pull request:
https://github.com/apache/spark/pull/22085#discussion_r212762076
--- Diff:
core/src/main/scala/org/apache/spark/api/python/PythonRunner.scala ---
@@ -180,7 +188,73 @@ 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(/* port */ 0,
+ /* backlog */ 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()
+ // Wait for function call from python side.
+ sock.setSoTimeout(10000)
+ val input = new DataInputStream(sock.getInputStream())
+ input.readInt() match {
+ case
BarrierTaskContextMessageProtocol.BARRIER_FUNCTION =>
+ // The barrier() function may wait infinitely,
socket shall not timeout
+ // before the function finishes.
+ sock.setSoTimeout(0)
+ barrierAndServe(sock)
+
+ case _ =>
+ val out = new DataOutputStream(new
BufferedOutputStream(
+ sock.getOutputStream))
+
writeUTF(BarrierTaskContextMessageProtocol.ERROR_UNRECOGNIZED_FUNCTION, out)
+ }
+ } catch {
+ case e: SocketException if e.getMessage.contains("Socket
closed") =>
+ // It is possible that the ServerSocket is not closed,
but the native socket
+ // has already been closed, we shall catch and
silently ignore this case.
+ } finally {
+ if (sock != null) {
+ sock.close()
+ }
+ }
+ }
+ }
+ }.start()
+ }
+ val secret = if (isBarrier) {
+ authHelper.secret
+ } else {
+ ""
+ }
+ // Close ServerSocket on task completion.
+ serverSocket.foreach { server =>
+ context.addTaskCompletionListener(_ => server.close())
--- End diff --
Addressed in https://github.com/apache/spark/pull/22229
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
