Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/21575#discussion_r198579348
--- Diff: core/src/main/scala/org/apache/spark/HeartbeatReceiver.scala ---
@@ -21,6 +21,7 @@ import java.util.concurrent.{ScheduledFuture, TimeUnit}
import scala.collection.mutable
import scala.concurrent.Future
+import scala.concurrent.duration._
--- End diff --
this will be unused after you address my comments
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