Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/19750#discussion_r151287617 --- 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 -- `liveStages` is not a Scala map anymore.
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