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

    https://github.com/apache/spark/pull/21758#discussion_r202857737
  
    --- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala ---
    @@ -434,6 +434,17 @@ private[spark] class MapOutputTrackerMaster(
         }
       }
     
    +  /** Unregister all map output information of the given shuffle. */
    +  def unregisterAllMapOutput(shuffleId: Int) {
    +    shuffleStatuses.get(shuffleId) match {
    +      case Some(shuffleStatus) =>
    +        shuffleStatus.removeOutputsByFilter(x => true)
    +        incrementEpoch()
    +      case None =>
    +        throw new SparkException("unregisterAllMapOutput called for 
nonexistent shuffle ID")
    --- End diff --
    
    should include the shuffleId in the error message


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