spark集羣其中一個節點沒有啓動成功

Spark Command: /usr/java/jdk1.7/bin/java -cp ::/home/hadoop2/spark/spark-1.0.0/conf:/home/hadoop2/spark/spark-1.0.0/assembly/target/scala-2.10/spark-assembly-1.0.0-hadoop2.2.0.jar -XX:MaxPermSize=128m -Dspark.akka.logLifecycleEvents=true -Xms512m -Xmx512m org.apache.spark.deploy.worker.Worker spark://master:7077 --webui-port 8081
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14/07/19 17:05:07 INFO SecurityManager: Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
14/07/19 17:05:07 INFO SecurityManager: Changing view acls to: hadoop2
14/07/19 17:05:07 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(hadoop2)
14/07/19 17:06:11 INFO Slf4jLogger: Slf4jLogger started
14/07/19 17:06:16 INFO Remoting: Starting remoting
Exception in thread "main" java.util.concurrent.TimeoutException: Futures timed out after [10000 milliseconds]
    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 akka.remote.Remoting.start(Remoting.scala:173)
    at akka.remote.RemoteActorRefProvider.init(RemoteActorRefProvider.scala:184)
    at akka.actor.ActorSystemImpl._start$lzycompute(ActorSystem.scala:579)
    at akka.actor.ActorSystemImpl._start(ActorSystem.scala:577)
    at akka.actor.ActorSystemImpl.start(ActorSystem.scala:588)
    at akka.actor.ActorSystem$.apply(ActorSystem.scala:111)
    at akka.actor.ActorSystem$.apply(ActorSystem.scala:104)
    at org.apache.spark.util.AkkaUtils$.createActorSystem(AkkaUtils.scala:104)
    at org.apache.spark.deploy.worker.Worker$.startSystemAndActor(Worker.scala:386)
    at org.apache.spark.deploy.worker.Worker$.main(Worker.scala:367)

    at org.apache.spark.deploy.worker.Worker.main(Worker.scala)

我這裏是三個節點 ，一個master和三個worker。其中有一個worker和master在同一個節點上。很奇怪的是有的時候三個worker都能正常啓動，有的時候啓動兩個。有的時候只有一個worker。貌似也沒有什麼規律。