Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22381#discussion_r225721730
--- Diff:
core/src/main/scala/org/apache/spark/status/AppStatusListener.scala ---
@@ -17,6 +17,7 @@
package org.apache.spark.status
+import java.time.Duration
--- End diff --
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