title: Error while running standalone App example in Scala using the Spark API
body: <p>Iam unable to run the spark example
  (<a href="https://spark.incubator.apache.org/docs/latest/quick-start.html#a-standalone-app-in-scala" rel="nofollow">https://spark.incubator.apache.org/docs/latest/quick-start.html#a-standalone-app-in-scala</a>).</p>
  
  <p>sbt package command ran successfully. But sbt run command gives error.</p>
  
  <p>Output for sbt package</p>
  
  <pre><code>[info] Set current project to Simple Project (in build file:/home/raghuveer/Spark/)
  [info] Updating {file:/home/raghuveer/Spark/}default-13c61e...
  [info] Resolving com.codahale.metrics#metrics-graphite;3.0.0 ...
  [info] Done updating.
  [info] Compiling 1 Scala source to /home/raghuveer/Spark/target/scala-2.10/classes...
  [info] Packaging /home/raghuveer/Spark/target/scala-2.10/simple-project_2.10-1.0.jar ...
  [info] Done packaging.
  [success] Total time: 16 s, completed Feb 27, 2014 6:19:14 PM
  </code></pre>
  
  <p>Error for sbt run</p>
  
  <pre><code>ERROR executor.Executor: Exception in task ID 0 java.io.IOException: Server returned HTTP response code: 504 for URL:http://10.135.217.189:49650/jars/simple-project_2.10-1.0.jar
  at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1403)
  at java.net.URL.openStream(URL.java:1031)
  at org.apache.spark.util.Utils$.fetchFile(Utils.scala:253)
  at org.apache.spark.executor.Executor$$anonfun$org$apache$spark$executor$Executor$$updateDependencies$6.apply(Executor.scala:345)
  at org.apache.spark.executor.Executor$$anonfun$org$apache$spark$executor$Executor$$updateDependencies$6.apply(Executor.scala:343)
  at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:772)
  at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:98)
  at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:98)
  at scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:226)
  at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:39)
  at scala.collection.mutable.HashMap.foreach(HashMap.scala:98)
  at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:771)
  at org.apache.spark.executor.Executor.org$apache$spark$executor$Executor$$updateDependencies(Executor.scala:343)
  at org.apache.spark.executor.Executor$TaskRunner$$anonfun$run$1.apply$mcV$sp(Executor.scala:194)
  at org.apache.spark.deploy.SparkHadoopUtil.runAsUser(SparkHadoopUtil.scala:49)
  at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:178)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
  at java.lang.Thread.run(Thread.java:701)
  
  [error] (run-main) org.apache.spark.SparkException: Job aborted: Task 0.0:0 failed 1 times (most recent failure: 
  Exception failure: java.io.IOException: Server returned HTTP response code: 504 for URL:    http://10.135.217.189:49650/jars/simple-project_2.10-1.0.jar)org.apache.spark.SparkException: Job aborted: Task 0.0:0 failed 1 times (most recent failure:  
  Exception failure: java.io.IOException: Server returned HTTP response code: 504 for URL: http://10.135.217.189:49650/jars/simple-project_2.10-1.0.jar)
  </code></pre>
  
  <p>And the trace is</p>
  
  <pre><code>[trace] Stack trace suppressed: run last compile:run for the full output.
  14/02/27 18:20:58 INFO network.ConnectionManager: Selector thread was interrupted!
  java.lang.RuntimeException: Nonzero exit code: 1
  at scala.sys.package$.error(package.scala:27)
  [trace] Stack trace suppressed: run last compile:run for the full output.
  [error] (compile:run) Nonzero exit code: 1
  [error] Total time: 36 s, completed Feb 27, 2014 6:20:58 PM
  </code></pre>
  
  <p>EDIT: I disconnected the net connection and now the java.io.IOException: Server returned HTTP response code: 504 doesn't come and it ran successfully and shows the output.But i couldn't make it why its happening in that way.</p>