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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