Github user andrewor14 commented on a diff in the pull request: https://github.com/apache/spark/pull/10934#discussion_r51329576 --- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala --- @@ -1535,6 +1535,10 @@ abstract class RDD[T: ClassTag]( private[spark] var checkpointData: Option[RDDCheckpointData[T]] = None + // Whether checkpoint all RDDs that are marked with the checkpoint flag. --- End diff -- We need to expand on this comment: ``` // Whether to checkpoint all RDDs that are marked for checkpointing. By default, we stop // as soon as we find the first such RDD. This optimization allows us to write less data // but is not safe for all workloads. E.g. in streaming we may checkpoint both an RDD // and its parent every batch, in which case the parent may never be checkpointed // and its lineage never truncated (SPARK-6847). ```
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