Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/12655#discussion_r60858650
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -403,32 +403,47 @@ class DAGScheduler(
parents.toList
}
- /** Find ancestor shuffle dependencies that are not registered in
shuffleToMapStage yet */
- private def getAncestorShuffleDependencies(rdd: RDD[_]):
Stack[ShuffleDependency[_, _, _]] = {
- val parents = new Stack[ShuffleDependency[_, _, _]]
+ /**
+ * Find ancestor shuffle dependencies that are not registered in
shuffleToMapStage yet.
+ * This is done in topological order to create ancestor stages first to
ensure that the result
--- End diff --
Can you move this comment to some place inside the method? It doesn't seem
relevant to someone using this method, since the order of the
ShuffleDependencies returned doesn't matter
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