Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22341#discussion_r216404844
--- Diff:
core/src/main/scala/org/apache/spark/status/AppStatusListener.scala ---
@@ -23,6 +23,7 @@ import java.util.function.Function
import scala.collection.JavaConverters._
import scala.collection.mutable.HashMap
+import scala.collection.mutable.HashSet
--- End diff --
nit: merge with above import
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