Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2471#discussion_r18737213
--- Diff:
core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala ---
@@ -28,15 +28,27 @@ import org.apache.spark.deploy.SparkHadoopUtil
import org.apache.spark.scheduler._
import org.apache.spark.ui.SparkUI
import org.apache.spark.util.Utils
+import java.util.concurrent.TimeUnit
+import scala.concurrent.duration.Duration
--- End diff --
nit: should be up there with other scala imports
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