Github user xuanyuanking commented on a diff in the pull request: https://github.com/apache/spark/pull/21353#discussion_r188974568 --- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala --- @@ -213,6 +213,12 @@ private[spark] sealed trait MapOutputTrackerMessage private[spark] case class GetMapOutputStatuses(shuffleId: Int) extends MapOutputTrackerMessage private[spark] case object StopMapOutputTracker extends MapOutputTrackerMessage +private[spark] case class CheckNoMissingPartitions(shuffleId: Int) --- End diff -- Changes about MapOutputTracker same in #21293
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