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

    https://github.com/apache/spark/pull/3009#discussion_r20669574
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/SparkListener.scala ---
    @@ -56,7 +56,11 @@ case class SparkListenerTaskEnd(
       extends SparkListenerEvent
     
     @DeveloperApi
    -case class SparkListenerJobStart(jobId: Int, stageIds: Seq[Int], 
properties: Properties = null)
    +case class SparkListenerJobStart(
    +    jobId: Int,
    +    stageInfos: Seq[StageInfo],
    +    stageIds: Seq[Int],  // Note: this is here for backwards-compatibility
    --- End diff --
    
    The problem I described could be fixed by just modifying the serializer and 
not the message here. However, we'd also like to provide binary compatiblity 
for people who wrote custom listeners and expect this field to be there.


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