Github user darkcrawler01 commented on the pull request:
https://github.com/apache/spark/pull/7110#issuecomment-120813333
```java
15/07/12 14:17:31 ERROR executor.CoarseGrainedExecutorBackend: Cannot
register with driver:
akka.tcp://[email protected]:41698/user/CoarseGrainedScheduler
java.lang.NullPointerException
at
org.apache.spark.rpc.akka.AkkaRpcEndpointRef.actorRef$lzycompute(AkkaRpcEnv.scala:273)
at
org.apache.spark.rpc.akka.AkkaRpcEndpointRef.actorRef(AkkaRpcEnv.scala:273)
at
org.apache.spark.rpc.akka.AkkaRpcEndpointRef.toString(AkkaRpcEnv.scala:313)
at java.lang.String.valueOf(String.java:2981)
at
scala.collection.mutable.StringBuilder.append(StringBuilder.scala:197)
at
org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend$DriverEndpoint$$anonfun$receiveAndReply$1$$anonfun$applyOrElse$3.apply(CoarseGrainedSchedulerBackend.scala:125)
at
org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend$DriverEndpoint$$anonfun$receiveAndReply$1$$anonfun$applyOrElse$3.apply(CoarseGrainedSchedulerBackend.scala:125)
at org.apache.spark.Logging$class.logInfo(Logging.scala:59)
at
org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend$DriverEndpoint.logInfo(CoarseGrainedSchedulerBackend.scala:69)
at
org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend$DriverEndpoint$$anonfun$receiveAndReply$1.applyOrElse(CoarseGrainedSchedulerBackend.scala:125)
at
org.apache.spark.rpc.akka.AkkaRpcEnv.org$apache$spark$rpc$akka$AkkaRpcEnv$$processMessage(AkkaRpcEnv.scala:178)
at
org.apache.spark.rpc.akka.AkkaRpcEnv$$anonfun$actorRef$lzycompute$1$1$$anon$1$$anonfun$receiveWithLogging$1$$anonfun$applyOrElse$4.apply$mcV$sp(AkkaRpcEnv.scala:127)
at
org.apache.spark.rpc.akka.AkkaRpcEnv.org$apache$spark$rpc$akka$AkkaRpcEnv$$safelyCall(AkkaRpcEnv.scala:198)
at
org.apache.spark.rpc.akka.AkkaRpcEnv$$anonfun$actorRef$lzycompute$1$1$$anon$1$$anonfun$receiveWithLogging$1.applyOrElse(AkkaRpcEnv.scala:126)
at
scala.runtime.AbstractPartialFunction$mcVL$sp.apply$mcVL$sp(AbstractPartialFunction.scala:33)
at
scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:33)
at
scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:25)
at
org.apache.spark.util.ActorLogReceive$$anon$1.apply(ActorLogReceive.scala:59)
at
org.apache.spark.util.ActorLogReceive$$anon$1.apply(ActorLogReceive.scala:42)
at
scala.PartialFunction$class.applyOrElse(PartialFunction.scala:118)
at
org.apache.spark.util.ActorLogReceive$$anon$1.applyOrElse(ActorLogReceive.scala:42)
at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
at
org.apache.spark.rpc.akka.AkkaRpcEnv$$anonfun$actorRef$lzycompute$1$1$$anon$1.aroundReceive(AkkaRpcEnv.scala:93)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
at akka.dispatch.Mailbox.run(Mailbox.scala:220)
at
akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
at
scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at
scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
```
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