Style fixes and addressed review comments at #221

assembly/pom.xml

@@ -41,27 +41,27 @@
   <dependencies>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-core_${scala-short.version}</artifactId>
+      <artifactId>spark-core_2.10</artifactId>
       <version>${project.version}</version>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-bagel_${scala-short.version}</artifactId>
+      <artifactId>spark-bagel_2.10</artifactId>
       <version>${project.version}</version>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-mllib_${scala-short.version}</artifactId>
+      <artifactId>spark-mllib_2.10</artifactId>
       <version>${project.version}</version>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-repl_${scala-short.version}</artifactId>
+      <artifactId>spark-repl_2.10</artifactId>
       <version>${project.version}</version>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-streaming_${scala-short.version}</artifactId>
+      <artifactId>spark-streaming_2.10</artifactId>
       <version>${project.version}</version>
     </dependency>
     <dependency>
@@ -79,7 +79,7 @@
         <artifactId>maven-shade-plugin</artifactId>
         <configuration>
           <shadedArtifactAttached>false</shadedArtifactAttached>
-          <outputFile>${project.build.directory}/scala-${scala-short.version}/${project.artifactId}-${project.version}-hadoop${hadoop.version}.jar</outputFile>
+          <outputFile>${project.build.directory}/scala-2.10/${project.artifactId}-${project.version}-hadoop${hadoop.version}.jar</outputFile>
           <artifactSet>
             <includes>
               <include>*:*</include>
@@ -128,7 +128,7 @@
       <dependencies>
         <dependency>
           <groupId>org.apache.spark</groupId>
-          <artifactId>spark-yarn_${scala-short.version}</artifactId>
+          <artifactId>spark-yarn_2.10</artifactId>
           <version>${project.version}</version>
         </dependency>
       </dependencies>

bagel/pom.xml

@@ -34,7 +34,7 @@
   <dependencies>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-core_${scala-short.version}</artifactId>
+      <artifactId>spark-core_2.10</artifactId>
       <version>${project.version}</version>
     </dependency>
     <dependency>
@@ -43,18 +43,18 @@
     </dependency>
     <dependency>
       <groupId>org.scalatest</groupId>
-      <artifactId>scalatest_${scala-short.version}</artifactId>
+      <artifactId>scalatest_2.10</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.scalacheck</groupId>
-      <artifactId>scalacheck_${scala-short.version}</artifactId>
+      <artifactId>scalacheck_2.10</artifactId>
       <scope>test</scope>
     </dependency>
   </dependencies>
   <build>
-    <outputDirectory>target/scala-${scala-short.version}/classes</outputDirectory>
-    <testOutputDirectory>target/scala-${scala-short.version}/test-classes</testOutputDirectory>
+    <outputDirectory>target/scala-2.10/classes</outputDirectory>
+    <testOutputDirectory>target/scala-2.10/test-classes</testOutputDirectory>
     <plugins>
       <plugin>
         <groupId>org.scalatest</groupId>

core/pom.xml

@@ -86,7 +86,7 @@
     </dependency>
     <dependency>
       <groupId>com.twitter</groupId>
-      <artifactId>chill_${scala-short.version}</artifactId>
+      <artifactId>chill_2.10</artifactId>
       <version>0.3.1</version>
     </dependency>
     <dependency>
@@ -96,11 +96,11 @@
     </dependency>
     <dependency>
       <groupId>com.typesafe.akka</groupId>
-      <artifactId>akka-remote_${scala-short.version}</artifactId>
+      <artifactId>akka-remote_2.10</artifactId>
     </dependency>
     <dependency>
       <groupId>com.typesafe.akka</groupId>
-      <artifactId>akka-slf4j_${scala-short.version}</artifactId>
+      <artifactId>akka-slf4j_2.10</artifactId>
     </dependency>
     <dependency>
       <groupId>org.scala-lang</groupId>
@@ -108,7 +108,7 @@
     </dependency>
     <dependency>
       <groupId>net.liftweb</groupId>
-      <artifactId>lift-json_${scala-short.version}</artifactId>
+      <artifactId>lift-json_2.10</artifactId>
     </dependency>
     <dependency>
       <groupId>it.unimi.dsi</groupId>
@@ -120,7 +120,7 @@
     </dependency>
     <dependency>
       <groupId>com.github.scala-incubator.io</groupId>
-      <artifactId>scala-io-file_${scala-short.version}</artifactId>
+      <artifactId>scala-io-file_2.10</artifactId>
     </dependency>
     <dependency>
       <groupId>org.apache.mesos</groupId>
@@ -166,12 +166,12 @@
     </dependency>
     <dependency>
       <groupId>org.scalatest</groupId>
-      <artifactId>scalatest_${scala-short.version}</artifactId>
+      <artifactId>scalatest_2.10</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.scalacheck</groupId>
-      <artifactId>scalacheck_${scala-short.version}</artifactId>
+      <artifactId>scalacheck_2.10</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -191,8 +191,8 @@
     </dependency>
   </dependencies>
   <build>
-    <outputDirectory>target/scala-${scala-short.version}/classes</outputDirectory>
-    <testOutputDirectory>target/scala-${scala-short.version}/test-classes</testOutputDirectory>
+    <outputDirectory>target/scala-2.10/classes</outputDirectory>
+    <testOutputDirectory>target/scala-2.10/test-classes</testOutputDirectory>
     <plugins>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>

core/src/main/scala/org/apache/spark/MapOutputTracker.scala

@@ -72,12 +72,11 @@ private[spark] class MapOutputTracker extends Logging {
   // throw a SparkException if this fails.
   private def askTracker(message: Any): Any = {
     try {
-      val future = if (trackerActor.isLeft ) {
-        trackerActor.left.get.ask(message)(timeout)
-      } else {
-        trackerActor.right.get.ask(message)(timeout)
+      val future = trackerActor match {
+        case Left(a: ActorRef) => a.ask(message)(timeout)
+        case Right(b: ActorSelection) => b.ask(message)(timeout)
       }
-      return Await.result(future, timeout)
+      Await.result(future, timeout)
     } catch {
       case e: Exception =>
         throw new SparkException("Error communicating with MapOutputTracker", e)

core/src/main/scala/org/apache/spark/Partitioner.scala

@@ -17,11 +17,11 @@
 
 package org.apache.spark
 
-import org.apache.spark.util.Utils
-import org.apache.spark.rdd.RDD
-
 import scala.reflect.ClassTag
 
+import org.apache.spark.rdd.RDD
+import org.apache.spark.util.Utils
+
 /**
  * An object that defines how the elements in a key-value pair RDD are partitioned by key.
  * Maps each key to a partition ID, from 0 to `numPartitions - 1`.

core/src/main/scala/org/apache/spark/deploy/worker/ui/WorkerWebUI.scala

@@ -17,23 +17,19 @@
 
 package org.apache.spark.deploy.worker.ui
 
-import akka.actor.ActorRef
-import akka.util.Timeout
+import java.io.File
 
 import scala.concurrent.duration._
 
-import java.io.{FileInputStream, File}
-
+import akka.util.Timeout
 import javax.servlet.http.HttpServletRequest
 
-import org.eclipse.jetty.server.{Handler, Server}
-
+import org.apache.spark.Logging
 import org.apache.spark.deploy.worker.Worker
-import org.apache.spark.{Logging}
-import org.apache.spark.ui.JettyUtils
+import org.apache.spark.ui.{JettyUtils, UIUtils}
 import org.apache.spark.ui.JettyUtils._
-import org.apache.spark.ui.UIUtils
 import org.apache.spark.util.Utils
+import org.eclipse.jetty.server.{Handler, Server}
 
 /**
  * Web UI server for the standalone worker.

core/src/main/scala/org/apache/spark/rdd/CheckpointRDD.scala

@@ -17,16 +17,13 @@
 
 package org.apache.spark.rdd
 
+import java.io.IOException
+
 import scala.reflect.ClassTag
+
+import org.apache.hadoop.fs.Path
 import org.apache.spark._
 import org.apache.spark.deploy.SparkHadoopUtil
-import org.apache.hadoop.mapred.{FileInputFormat, SequenceFileInputFormat, JobConf, Reporter}
-import org.apache.hadoop.conf.Configuration
-import org.apache.hadoop.io.{NullWritable, BytesWritable}
-import org.apache.hadoop.util.ReflectionUtils
-import org.apache.hadoop.fs.Path
-import java.io.{File, IOException, EOFException}
-import java.text.NumberFormat
 
 private[spark] class CheckpointRDDPartition(val index: Int) extends Partition {}
 

core/src/main/scala/org/apache/spark/rdd/JdbcRDD.scala

@@ -20,6 +20,7 @@ package org.apache.spark.rdd
 import java.sql.{Connection, ResultSet}
 
 import scala.reflect.ClassTag
+
 import org.apache.spark.{Logging, Partition, SparkContext, TaskContext}
 import org.apache.spark.util.NextIterator
 

core/src/main/scala/org/apache/spark/rdd/MappedRDD.scala

@@ -17,9 +17,10 @@
 
 package org.apache.spark.rdd
 
-import org.apache.spark.{Partition, TaskContext}
 import scala.reflect.ClassTag
 
+import org.apache.spark.{Partition, TaskContext}
+
 private[spark]
 class MappedRDD[U: ClassTag, T: ClassTag](prev: RDD[T], f: T => U)
   extends RDD[U](prev) {

core/src/main/scala/org/apache/spark/rdd/OrderedRDDFunctions.scala

@@ -17,9 +17,10 @@
 
 package org.apache.spark.rdd
 
-import org.apache.spark.{RangePartitioner, Logging}
 import scala.reflect.ClassTag
 
+import org.apache.spark.{Logging, RangePartitioner}
+
 /**
  * Extra functions available on RDDs of (key, value) pairs where the key is sortable through
  * an implicit conversion. Import `org.apache.spark.SparkContext._` at the top of your program to

core/src/main/scala/org/apache/spark/rdd/ShuffledRDD.scala

@@ -17,9 +17,10 @@
 
 package org.apache.spark.rdd
 
-import org.apache.spark.{Dependency, Partitioner, SparkEnv, ShuffleDependency, Partition, TaskContext}
 import scala.reflect.ClassTag
 
+import org.apache.spark.{Dependency, Partition, Partitioner, ShuffleDependency,
+  SparkEnv, TaskContext}
 
 private[spark] class ShuffledRDDPartition(val idx: Int) extends Partition {
   override val index = idx

core/src/main/scala/org/apache/spark/storage/BlockManagerMaster.scala

@@ -157,10 +157,9 @@ private[spark] class BlockManagerMaster(var driverActor : Either[ActorRef, Actor
     while (attempts < AKKA_RETRY_ATTEMPTS) {
       attempts += 1
       try {
-        val future = if (driverActor.isLeft ) {
-          driverActor.left.get.ask(message)(timeout)
-        } else {
-          driverActor.right.get.ask(message)(timeout)
+        val future = driverActor match {
+          case Left(a: ActorRef) => a.ask(message)(timeout)
+          case Right(b: ActorSelection) => b.ask(message)(timeout)
         }
         val result = Await.result(future, timeout)
         if (result == null) {

core/src/main/scala/org/apache/spark/util/IndestructibleActorSystem.scala

-/**
- *  Copyright (C) 2009-2013 Typesafe Inc. <http://www.typesafe.com>
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 // Must be in akka.actor package as ActorSystemImpl is protected[akka].

examples/pom.xml

@@ -49,25 +49,25 @@
   <dependencies>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-core_${scala-short.version}</artifactId>
+      <artifactId>spark-core_2.10</artifactId>
       <version>${project.version}</version>
       <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-streaming_${scala-short.version}</artifactId>
+      <artifactId>spark-streaming_2.10</artifactId>
       <version>${project.version}</version>
       <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-mllib_${scala-short.version}</artifactId>
+      <artifactId>spark-mllib_2.10</artifactId>
       <version>${project.version}</version>
       <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-bagel_${scala-short.version}</artifactId>
+      <artifactId>spark-bagel_2.10</artifactId>
       <version>${project.version}</version>
       <scope>provided</scope>
     </dependency>
@@ -88,7 +88,7 @@
     </dependency>
     <dependency>
       <groupId>org.apache.kafka</groupId>
-      <artifactId>kafka_2.9.2</artifactId>
+      <artifactId>kafka_2.10</artifactId>
       <version>0.8.0-beta1</version>
       <exclusions>
         <exclusion>
@@ -107,17 +107,17 @@
     </dependency>
     <dependency>
       <groupId>com.twitter</groupId>
-      <artifactId>algebird-core_${scala-short.version}</artifactId>
+      <artifactId>algebird-core_2.10</artifactId>
       <version>0.1.11</version>
     </dependency>
     <dependency>
       <groupId>org.scalatest</groupId>
-      <artifactId>scalatest_${scala-short.version}</artifactId>
+      <artifactId>scalatest_2.10</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.scalacheck</groupId>
-      <artifactId>scalacheck_${scala-short.version}</artifactId>
+      <artifactId>scalacheck_2.10</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -166,8 +166,8 @@
   </dependencies>
 
   <build>
-    <outputDirectory>target/scala-${scala-short.version}/classes</outputDirectory>
-    <testOutputDirectory>target/scala-${scala-short.version}/test-classes</testOutputDirectory>
+    <outputDirectory>target/scala-2.10/classes</outputDirectory>
+    <testOutputDirectory>target/scala-2.10/test-classes</testOutputDirectory>
     <plugins>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>

mllib/pom.xml

@@ -34,7 +34,7 @@
   <dependencies>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-core_${scala-short.version}</artifactId>
+      <artifactId>spark-core_2.10</artifactId>
       <version>${project.version}</version>
     </dependency>
     <dependency>
@@ -48,12 +48,12 @@
     </dependency>
     <dependency>
       <groupId>org.scalatest</groupId>
-      <artifactId>scalatest_${scala-short.version}</artifactId>
+      <artifactId>scalatest_2.10</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.scalacheck</groupId>
-      <artifactId>scalacheck_${scala-short.version}</artifactId>
+      <artifactId>scalacheck_2.10</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -63,8 +63,8 @@
     </dependency>
   </dependencies>
   <build>
-    <outputDirectory>target/scala-${scala-short.version}/classes</outputDirectory>
-    <testOutputDirectory>target/scala-${scala-short.version}/test-classes</testOutputDirectory>
+    <outputDirectory>target/scala-2.10/classes</outputDirectory>
+    <testOutputDirectory>target/scala-2.10/test-classes</testOutputDirectory>
     <plugins>
       <plugin>
         <groupId>org.scalatest</groupId>

pom.xml

@@ -101,7 +101,6 @@
 
     <java.version>1.6</java.version>
 
-    <scala-short.version>2.10</scala-short.version>
     <scala.version>2.10.3</scala.version>
     <mesos.version>0.13.0</mesos.version>
     <akka.version>2.2.3</akka.version>
@@ -205,7 +204,7 @@
       </dependency>
       <dependency>
         <groupId>com.twitter</groupId>
-        <artifactId>chill_${scala-short.version}</artifactId>
+        <artifactId>chill_2.10</artifactId>
         <version>0.3.1</version>
       </dependency>
       <dependency>
@@ -215,7 +214,7 @@
       </dependency>
       <dependency>
         <groupId>com.typesafe.akka</groupId>
-        <artifactId>akka-actor_${scala-short.version}</artifactId>
+        <artifactId>akka-actor_2.10</artifactId>
         <version>${akka.version}</version>
         <exclusions>
           <exclusion>
@@ -226,7 +225,7 @@
       </dependency>
       <dependency>
         <groupId>com.typesafe.akka</groupId>
-        <artifactId>akka-remote_${scala-short.version}</artifactId>
+        <artifactId>akka-remote_2.10</artifactId>
         <version>${akka.version}</version>
         <exclusions>
           <exclusion>
@@ -237,7 +236,7 @@
       </dependency>
       <dependency>
         <groupId>com.typesafe.akka</groupId>
-        <artifactId>akka-slf4j_${scala-short.version}</artifactId>
+        <artifactId>akka-slf4j_2.10</artifactId>
         <version>${akka.version}</version>
         <exclusions>
           <exclusion>
@@ -258,7 +257,7 @@
       </dependency>
       <dependency>
         <groupId>com.github.scala-incubator.io</groupId>
-        <artifactId>scala-io-file_${scala-short.version}</artifactId>
+        <artifactId>scala-io-file_2.10</artifactId>
         <version>0.4.1</version>
       </dependency>
       <dependency>
@@ -279,7 +278,7 @@
       </dependency>
       <dependency>
         <groupId>net.liftweb</groupId>
-        <artifactId>lift-json_${scala-short.version}</artifactId>
+        <artifactId>lift-json_2.10</artifactId>
         <version>2.5.1</version>
         <exclusions>
           <exclusion>
@@ -335,7 +334,7 @@
       </dependency>
       <dependency>
         <groupId>org.scalatest</groupId>
-        <artifactId>scalatest_${scala-short.version}</artifactId>
+        <artifactId>scalatest_2.10</artifactId>
         <version>1.9.1</version>
         <scope>test</scope>
       </dependency>
@@ -358,7 +357,7 @@
       </dependency>
       <dependency>
         <groupId>org.scalacheck</groupId>
-        <artifactId>scalacheck_${scala-short.version}</artifactId>
+        <artifactId>scalacheck_2.10</artifactId>
         <version>1.10.0</version>
         <scope>test</scope>
       </dependency>

repl-bin/pom.xml

@@ -40,18 +40,18 @@
   <dependencies>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-core_${scala-short.version}</artifactId>
+      <artifactId>spark-core_2.10</artifactId>
       <version>${project.version}</version>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-bagel_${scala-short.version}</artifactId>
+      <artifactId>spark-bagel_2.10</artifactId>
       <version>${project.version}</version>
       <scope>runtime</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-repl_${scala-short.version}</artifactId>
+      <artifactId>spark-repl_2.10</artifactId>
       <version>${project.version}</version>
       <scope>runtime</scope>
     </dependency>

repl/pom.xml

@@ -39,18 +39,18 @@
   <dependencies>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-core_${scala-short.version}</artifactId>
+      <artifactId>spark-core_2.10</artifactId>
       <version>${project.version}</version>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-bagel_${scala-short.version}</artifactId>
+      <artifactId>spark-bagel_2.10</artifactId>
       <version>${project.version}</version>
       <scope>runtime</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-mllib_${scala-short.version}</artifactId>
+      <artifactId>spark-mllib_2.10</artifactId>
       <version>${project.version}</version>
       <scope>runtime</scope>
     </dependency>
@@ -78,18 +78,18 @@
     </dependency>
     <dependency>
       <groupId>org.scalatest</groupId>
-      <artifactId>scalatest_${scala-short.version}</artifactId>
+      <artifactId>scalatest_2.10</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.scalacheck</groupId>
-      <artifactId>scalacheck_${scala-short.version}</artifactId>
+      <artifactId>scalacheck_2.10</artifactId>
       <scope>test</scope>
     </dependency>
   </dependencies>
   <build>
-    <outputDirectory>target/scala-${scala-short.version}/classes</outputDirectory>
-    <testOutputDirectory>target/scala-${scala-short.version}/test-classes</testOutputDirectory>
+    <outputDirectory>target/scala-2.10/classes</outputDirectory>
+    <testOutputDirectory>target/scala-2.10/test-classes</testOutputDirectory>
     <plugins>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>

streaming/pom.xml

@@ -48,7 +48,7 @@
   <dependencies>
     <dependency>
       <groupId>org.apache.spark</groupId>
-      <artifactId>spark-core_${scala-short.version}</artifactId>
+      <artifactId>spark-core_2.10</artifactId>
       <version>${project.version}</version>
     </dependency>
     <dependency>
@@ -61,8 +61,8 @@
       <version>1.9.11</version>
     </dependency>
     <dependency>
-      <groupId>org.apache.kafka</groupId>
-      <artifactId>kafka_2.9.2</artifactId>
+      <groupId>com.sksamuel.kafka</groupId>
+      <artifactId>kafka_2.10</artifactId>
       <version>0.8.0-beta1</version>
       <exclusions>
         <exclusion>
@@ -111,7 +111,7 @@
     </dependency>
     <dependency>
       <groupId>com.typesafe.akka</groupId>
-      <artifactId>akka-zeromq_${scala-short.version}</artifactId>
+      <artifactId>akka-zeromq_2.10</artifactId>
       <version>${akka.version}</version>
       <exclusions>
         <exclusion>
@@ -122,12 +122,12 @@
     </dependency>
     <dependency>
       <groupId>org.scalatest</groupId>
-      <artifactId>scalatest_${scala-short.version}</artifactId>
+      <artifactId>scalatest_2.10</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.scalacheck</groupId>
-      <artifactId>scalacheck_${scala-short.version}</artifactId>
+      <artifactId>scalacheck_2.10</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -151,8 +151,8 @@
     </dependency>
   </dependencies>
   <build>
-    <outputDirectory>target/scala-${scala-short.version}/classes</outputDirectory>
-    <testOutputDirectory>target/scala-${scala-short.version}/test-classes</testOutputDirectory>
+    <outputDirectory>target/scala-2.10/classes</outputDirectory>
+    <testOutputDirectory>target/scala-2.10/test-classes</testOutputDirectory>
     <plugins>
       <plugin>
         <groupId>org.scalatest</groupId>

streaming/src/main/scala/org/apache/spark/streaming/receivers/ZeroMQReceiver.scala

@@ -17,14 +17,14 @@
 
 package org.apache.spark.streaming.receivers
 
+import scala.reflect.ClassTag
+
 import akka.actor.Actor
 import akka.util.ByteString
 import akka.zeromq._
 
 import org.apache.spark.Logging
 
-import scala.reflect.ClassTag
-
 /**
  * A receiver to subscribe to ZeroMQ stream.
  */