Github user WeichenXu123 commented on a diff in the pull request:
https://github.com/apache/spark/pull/16576#discussion_r96573963
--- 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) {
+ logWarning(s"Because job has been executed on RDD ${id}, checkpoint
won't work")
--- End diff --
reping @zsxwing Would you mind take a look? This is a simple PR but it will
bring much help for spark developers to avoid them making some mistake usage...
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