Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/13646#discussion_r67006526
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -378,31 +378,9 @@ class DAGScheduler(
* the provided firstJobId.
*/
private def getParentStages(rdd: RDD[_], firstJobId: Int): List[Stage] =
{
- val parents = new HashSet[Stage]
- val visited = new HashSet[RDD[_]]
- // We are manually maintaining a stack here to prevent
StackOverflowError
- // caused by recursively visiting
- val waitingForVisit = new Stack[RDD[_]]
- def visit(r: RDD[_]) {
- if (!visited(r)) {
- visited += r
- // Kind of ugly: need to register RDDs with the cache here since
- // we can't do it in its constructor because # of partitions is
unknown
--- End diff --
this comment is getting lost ... but I think that is OK, I have no idea
what it is referring to here. Its also in `newOrUsedShuffleStage`, which is
probably the only place it belongs.
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