Github user HyukjinKwon commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20424#discussion_r168075988
  
    --- Diff: 
core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala ---
    @@ -191,7 +192,26 @@ private[spark] class PythonWorkerFactory(pythonExec: 
String, envVars: Map[String
             daemon = pb.start()
     
             val in = new DataInputStream(daemon.getInputStream)
    -        daemonPort = in.readInt()
    +        try {
    +          daemonPort = in.readInt()
    +        } catch {
    +          case _: EOFException =>
    +            throw new IOException(s"No port number in $daemonModule's 
stdout")
    --- End diff --
    
    Here too, `SparkException`.


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