Github user suyanNone commented on a diff in the pull request: https://github.com/apache/spark/pull/4055#discussion_r32811839 --- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala --- @@ -305,7 +305,7 @@ private[spark] class MapOutputTrackerMaster(conf: SparkConf) if (mapStatuses.contains(shuffleId)) { val statuses = mapStatuses(shuffleId) - if (statuses.nonEmpty) { + if (statuses.nonEmpty && statuses.exists(_ != null)) { --- End diff -- nonEmpty is just to judge the array length != 0 but we will register array[partitionSize] for each shuffle when job submit. So statuses,nonEmpty is always true
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