Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/42#discussion_r10368558
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/SparkListener.scala ---
    @@ -19,33 +19,43 @@ package org.apache.spark.scheduler
     
     import java.util.Properties
     
    +import scala.collection.Map
    +
    +import org.apache.spark.util.{Utils, Distribution}
     import org.apache.spark.{Logging, TaskEndReason}
     import org.apache.spark.executor.TaskMetrics
    -import org.apache.spark.util.{Distribution, Utils}
    +import org.apache.spark.storage.StorageStatus
    +
    +sealed trait SparkListenerEvent
    +
    +case class SparkListenerStageSubmitted(stageInfo: StageInfo, properties: 
Properties = null)
    +  extends SparkListenerEvent
    +
    +case class SparkListenerStageCompleted(stageInfo: StageInfo) extends 
SparkListenerEvent
     
    -sealed trait SparkListenerEvents
    +case class SparkListenerTaskStart(stageId: Int, taskInfo: TaskInfo) 
extends SparkListenerEvent
     
    -case class SparkListenerStageSubmitted(stage: StageInfo, properties: 
Properties)
    -     extends SparkListenerEvents
    +case class SparkListenerTaskGettingResult(taskInfo: TaskInfo) extends 
SparkListenerEvent
     
    -case class SparkListenerStageCompleted(stage: StageInfo) extends 
SparkListenerEvents
    +case class SparkListenerTaskEnd(stageId: Int, taskType: String, reason: 
TaskEndReason,
    +  taskInfo: TaskInfo, taskMetrics: TaskMetrics) extends SparkListenerEvent
     
    -case class SparkListenerTaskStart(task: Task[_], taskInfo: TaskInfo) 
extends SparkListenerEvents
    +case class SparkListenerJobStart(jobId: Int, stageIds: Seq[Int], 
properties: Properties = null)
    +  extends SparkListenerEvent
     
    -case class SparkListenerTaskGettingResult(
    -  task: Task[_], taskInfo: TaskInfo) extends SparkListenerEvents
    +case class SparkListenerJobEnd(jobId: Int, jobResult: JobResult) extends 
SparkListenerEvent
     
    -case class SparkListenerTaskEnd(task: Task[_], reason: TaskEndReason, 
taskInfo: TaskInfo,
    -     taskMetrics: TaskMetrics) extends SparkListenerEvents
    +case class SparkListenerEnvironmentUpdate(environmentDetails: Map[String, 
Seq[(String, String)]])
    +  extends SparkListenerEvent
     
    -case class SparkListenerJobStart(job: ActiveJob, stageIds: Array[Int],
    -    properties: Properties = null) extends SparkListenerEvents
    +case class SparkListenerExecutorsStateChange(storageStatusList: 
Seq[StorageStatus])
    --- End diff --
    
    Sounds reasonable


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