Github user markhamstra commented on a diff in the pull request:
https://github.com/apache/spark/pull/1362#discussion_r15041791
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -1107,7 +1106,6 @@ class DAGScheduler(
case shufDep: ShuffleDependency[_, _, _] =>
val mapStage = getShuffleMapStage(shufDep, stage.jobId)
if (!mapStage.isAvailable) {
- visitedStages += mapStage
--- End diff --
Yup, it's odd -- and it looks to me like it has been that way since this
section of code was introduced. Looks like there should be an `if
(!visitedStages(mapStage))` guarding `visit(mapStage.rdd)`... testing...
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