Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11720#discussion_r57667547
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -286,6 +286,7 @@ class DAGScheduler(
case None =>
// We are going to register ancestor shuffle dependencies
getAncestorShuffleDependencies(shuffleDep.rdd).foreach { dep =>
+ assert(!shuffleToMapStage.get(dep.shuffleId).isDefined)
--- End diff --
@markhamstra Thank you for your review.
I'll remove the assertion for now but notice that there is a case that some
stages refer the overwritten stage as its parent by the overwrite, which is
undesirable for `DAGScheduler`.
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