[GitHub] [spark] srowen commented on a change in pull request #24586: [SPARK-27682][CORE][GRAPHX][MLLIB] Replace use of collections and methods that will be removed in Scala 2.13 with work-alikes

[GitBox <gi...@apache.org>]

srowen commented on a change in pull request #24586: [SPARK-27682][CORE][GRAPHX][MLLIB] Replace use of collections and methods that will be removed in Scala 2.13 with work-alikes
URL: https://github.com/apache/spark/pull/24586#discussion_r283107192
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
 ##########
 @@ -468,21 +468,20 @@ private[spark] class DAGScheduler(
 
   /** Find ancestor shuffle dependencies that are not registered in shuffleToMapStage yet */
   private def getMissingAncestorShuffleDependencies(
-      rdd: RDD[_]): ArrayStack[ShuffleDependency[_, _, _]] = {
-    val ancestors = new ArrayStack[ShuffleDependency[_, _, _]]
+      rdd: RDD[_]): ListBuffer[ShuffleDependency[_, _, _]] = {
+    val ancestors = new ListBuffer[ShuffleDependency[_, _, _]]
     val visited = new HashSet[RDD[_]]
     // We are manually maintaining a stack here to prevent StackOverflowError
     // caused by recursively visiting
-    val waitingForVisit = new ArrayStack[RDD[_]]
-    waitingForVisit.push(rdd)
+    val waitingForVisit = ListBuffer[RDD[_]](rdd)
     while (waitingForVisit.nonEmpty) {
-      val toVisit = waitingForVisit.pop()
+      val toVisit = waitingForVisit.remove(0)
 
 Review comment:
   "pop" the first element

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
users@infra.apache.org


With regards,
Apache Git Services

---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscribe@spark.apache.org
For additional commands, e-mail: reviews-help@spark.apache.org