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

    https://github.com/apache/spark/pull/22085#discussion_r211356840
  
    --- Diff: 
core/src/main/scala/org/apache/spark/api/python/PythonRunner.scala ---
    @@ -76,6 +77,15 @@ private[spark] abstract class BasePythonRunner[IN, OUT](
       // TODO: support accumulator in multiple UDF
       protected val accumulator = funcs.head.funcs.head.accumulator
     
    +  // Expose a ServerSocket to support method calls via socket from Python 
side.
    +  private[spark] var serverSocket: Option[ServerSocket] = None
    +
    +  // Authentication helper used when serving method calls via socket from 
Python side.
    +  private lazy val authHelper = {
    +    val conf = Option(SparkEnv.get).map(_.conf).getOrElse(new SparkConf())
    --- End diff --
    
    When `SparkEnv.get` returns null?


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