Hi, I've been trying to run a simple SparkWordCount app on EC2, but it looks like my apps are not succeeding/completing. I'm suspecting some sort of communication issue. I used the SparkWordCount app from http://blog.cloudera.com/blog/2014/04/how-to-run-a-simple-apache-spark-app-in-cdh-5/
Digging through logs I found this: 15/03/16 21:28:20 INFO Utils: Successfully started service 'driverPropsFetcher' on port 58123. Exception in thread "main" java.lang.reflect.UndeclaredThrowableException at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1563) at org.apache.spark.deploy.SparkHadoopUtil.runAsSparkUser(SparkHadoopUtil.scala:60) at org.apache.spark.executor.CoarseGrainedExecutorBackend$.run(CoarseGrainedExecutorBackend.scala:115) at org.apache.spark.executor.CoarseGrainedExecutorBackend$.main(CoarseGrainedExecutorBackend.scala:163) at org.apache.spark.executor.CoarseGrainedExecutorBackend.main(CoarseGrainedExecutorBackend.scala) * Caused by: java.util.concurrent.TimeoutException: Futures timed out after [30 seconds] * at scala.concurrent.impl.Promise$DefaultPromise.ready(Promise.scala:219) at scala.concurrent.impl.Promise$DefaultPromise.result(Promise.scala:223) at scala.concurrent.Await$$anonfun$result$1.apply(package.scala:107) at scala.concurrent.BlockContext$DefaultBlockContext$.blockOn(BlockContext.scala:53) at scala.concurrent.Await$.result(package.scala:107) at org.apache.spark.executor.CoarseGrainedExecutorBackend$$anonfun$run$1.apply$mcV$sp(CoarseGrainedExecutorBackend.scala:127) at org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:61) at org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:60) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548) ... 4 more Or exceptions like: *Caused by: akka.pattern.AskTimeoutException: Ask timed out on [ActorSelection[Anchor(akka.tcp://sparkDriver@ip-10-111-222-111.ec2.internal:58360/), Path(/user/CoarseGrainedScheduler)]] after [30000 ms] * at akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:333) at akka.actor.Scheduler$$anon$7.run(Scheduler.scala:117) at scala.concurrent.Future$InternalCallbackExecutor$.scala$concurrent$Future$InternalCallbackExecutor$$unbatchedExecute(Future.scala:694) at scala.concurrent.Future$InternalCallbackExecutor$.execute(Future.scala:691) at akka.actor.LightArrayRevolverScheduler$TaskHolder.executeTask(Scheduler.scala:467) at akka.actor.LightArrayRevolverScheduler$$anon$8.executeBucket$1(Scheduler.scala:419) at akka.actor.LightArrayRevolverScheduler$$anon$8.nextTick(Scheduler.scala:423) at akka.actor.LightArrayRevolverScheduler$$anon$8.run(Scheduler.scala:375) at java.lang.Thread.run(Thread.java:745) This is in EC2 and I have ports 22, 7077, 8080, and 8081 open to any source. But maybe I need to do something, too? I do see Master sees Workers and Workers do connect to the Master. I did run this in spark-shell, and it runs without problems; scala> val something = sc.parallelize(1 to 10000000).collect().filter(_<1000 This is how I submitted the job (on the Master machine): $ spark-1.2.1-bin-hadoop2.4/bin/spark-submit --class com.cloudera.sparkwordcount.SparkWordCount --executor-memory 256m --master spark://ip-10-171-32-62:7077 wc-spark/target/sparkwordcount-0.0.1-SNAPSHOT.jar /usr/share/dict/words 0 Any help would be greatly appreciated. Thanks, Otis -- Monitoring * Alerting * Anomaly Detection * Centralized Log Management Solr & Elasticsearch Support * http://sematext.com/