Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/16576#discussion_r96130960
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -1539,6 +1539,9 @@ abstract class RDD[T: ClassTag](
// NOTE: we use a global lock here due to complexities downstream with
ensuring
// children RDD partitions point to the correct parent partitions. In
the future
// we should revisit this consideration.
+ if (doCheckpointCalled) {
--- End diff --
`doCheckpointCalled && !isCheckpointed`
If it is already checkpoint'ed successfully, then it is fine.
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