Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/5392#discussion_r27969603
--- Diff: core/src/main/scala/org/apache/spark/deploy/worker/Worker.scala
---
@@ -21,48 +21,50 @@ import java.io.File
import java.io.IOException
import java.text.SimpleDateFormat
import java.util.{UUID, Date}
+import java.util.concurrent._
import scala.collection.JavaConversions._
import scala.collection.mutable.{HashMap, HashSet}
-import scala.concurrent.duration._
-import scala.language.postfixOps
+import scala.concurrent.ExecutionContext
import scala.util.Random
-import akka.actor._
-import akka.remote.{DisassociatedEvent, RemotingLifecycleEvent}
-
+import org.apache.spark.rpc._
import org.apache.spark.{Logging, SecurityManager, SparkConf}
import org.apache.spark.deploy.{Command, ExecutorDescription,
ExecutorState}
import org.apache.spark.deploy.DeployMessages._
import org.apache.spark.deploy.master.{DriverState, Master}
import org.apache.spark.deploy.worker.ui.WorkerWebUI
import org.apache.spark.metrics.MetricsSystem
-import org.apache.spark.util.{ActorLogReceive, AkkaUtils, SignalLogger,
Utils}
+import org.apache.spark.util.{SignalLogger, Utils}
+
+import scala.util.control.NonFatal
--- End diff --
Fixed.
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