Github user ajbozarth commented on a diff in the pull request:
https://github.com/apache/spark/pull/19750#discussion_r151283135
--- Diff:
core/src/main/scala/org/apache/spark/status/AppStatusListener.scala ---
@@ -563,7 +575,7 @@ private[spark] class AppStatusListener(
/** Flush all live entities' data to the underlying store. */
def flush(): Unit = {
val now = System.nanoTime()
- liveStages.values.foreach { stage =>
+ liveStages.values.asScala.foreach { stage =>
--- End diff --
Why add `asScala`?
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