Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/2480#discussion_r17845815 --- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala --- @@ -1270,13 +1270,12 @@ abstract class RDD[T: ClassTag]( * doCheckpoint() is called recursively on the parent RDDs. */ private[spark] def doCheckpoint() { - if (!doCheckpointCalled) { - doCheckpointCalled = true - if (checkpointData.isDefined) { - checkpointData.get.doCheckpoint() - } else { - dependencies.foreach(_.rdd.doCheckpoint()) - } + if (checkpointData == None && doCheckpointCalled == 0) { --- End diff -- There is no explanation of what this change is trying to accomplish. What do you believe this fixes? I would not use "1" and "2" to represent some kind of state without explanation.
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