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

    https://github.com/apache/spark/pull/3711#discussion_r22624775
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/SparkListener.scala ---
    @@ -84,6 +85,14 @@ case class SparkListenerBlockManagerRemoved(time: Long, 
blockManagerId: BlockMan
     @DeveloperApi
     case class SparkListenerUnpersistRDD(rddId: Int) extends SparkListenerEvent
     
    +@DeveloperApi
    +case class SparkListenerExecutorAdded(executorId: String, executorDetails: 
ExecutorDetails)
    +  extends SparkListenerEvent
    +
    +@DeveloperApi
    +case class SparkListenerExecutorRemoved(executorId: String, 
executorDetails: ExecutorDetails)
    --- End diff --
    
    This makes the event more self describing. Otherwise you'd need to also 
listen on the executorAdded event, have a hashmap then look it up in the 
executor removed method to find the details. 
    
    That being said, I don't really feel that strongly so we can remove the 
executorDetails structure if you are concerned. 


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