Github user xuanyuanking commented on a diff in the pull request:
https://github.com/apache/spark/pull/21642#discussion_r200160022
--- Diff:
core/src/main/scala/org/apache/spark/status/AppStatusListener.scala ---
@@ -19,6 +19,7 @@ package org.apache.spark.status
import java.util.Date
import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.atomic.AtomicLong
--- End diff --
import order error here.
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