Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18887#discussion_r133000455
--- Diff:
core/src/main/scala/org/apache/spark/deploy/history/ApplicationHistoryProvider.scala
---
@@ -76,6 +76,14 @@ private[history] case class LoadedAppUI(
private[history] abstract class ApplicationHistoryProvider {
/**
+ * The number of applications available for listing. Separate method in
case it's cheaper
+ * to get a count than to calculate the whole listing.
--- End diff --
This is an interface, so this was added to allow implementations to
override this method if that makes sense.
It just looks like I lost the override in one of my rebases, so let me add
that back.
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