Github user markhamstra commented on a diff in the pull request:
https://github.com/apache/spark/pull/8923#discussion_r44844445
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -399,8 +399,8 @@ class DAGScheduler(
}
/** Find ancestor shuffle dependencies that are not registered in
shuffleToMapStage yet */
- private def getAncestorShuffleDependencies(rdd: RDD[_]):
Stack[ShuffleDependency[_, _, _]] = {
- val parents = new Stack[ShuffleDependency[_, _, _]]
+ private def getAncestorShuffleDependencies(rdd: RDD[_]):
Set[ShuffleDependency[_, _, _]] = {
--- End diff --
Please return an immutable Set.
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