Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/17458#discussion_r108521117
--- Diff: core/src/main/scala/org/apache/spark/ui/jobs/AllStagesPage.scala
---
@@ -34,9 +34,9 @@ private[ui] class AllStagesPage(parent: StagesTab)
extends WebUIPage("") {
listener.synchronized {
val activeStages = listener.activeStages.values.toSeq
val pendingStages = listener.pendingStages.values.toSeq
- val completedStages = listener.completedStages.reverse.toSeq
+ val completedStages = listener.completedStages.reverse
--- End diff --
I'm neutral on this because Seq.toSeq is a no-op anyway and, theoretically,
the type of completedStages could change and then this isn't a Seq, but, in
practice, wont' matter.
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