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

    https://github.com/apache/spark/pull/19211#discussion_r139529920
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/LiveListenerBus.scala ---
    @@ -39,20 +41,13 @@ import org.apache.spark.util.Utils
      * has started will events be actually propagated to all attached 
listeners. This listener bus
      * is stopped when `stop()` is called, and it will drop further events 
after stopping.
      */
    -private[spark] class LiveListenerBus(conf: SparkConf) extends 
SparkListenerBus {
    -
    -  self =>
    +private[spark] class LiveListenerBus(conf: SparkConf) {
     
       import LiveListenerBus._
     
       private var sparkContext: SparkContext = _
    --- End diff --
    
    Ah, this should be set in `start()`, probably deleted in one of the code 
moves.


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