I think SparkContext is thread-safe, you could concurrently submit jobs from different threads, the problem you hit might not relate to this. Can you reproduce this issue each time when you concurrently submit jobs, or is it happened occasionally?
BTW, I guess you're using the old version of Spark, it may potentially have concurrency problem, you could switch to a new version to take a try. Thanks Saisai On Fri, Dec 25, 2015 at 2:26 PM, donhoff_h <165612...@qq.com> wrote: > Hi,folks > > I wrote some spark jobs and these jobs could ran successfully when I ran > them one by one. But if I ran them concurrently, for example 12 jobs > parallel running, I met the following error. Could anybody tell me what > cause this? How to solve it? Many Thanks! > > Exception in thread "main" akka.actor.ActorNotFound: Actor not found for: > ActorSelection[Anchor(akka.tcp://sparkDriver@130.1.10.108:23600/), > Path(/user/MapOutputTracker)] > at > akka.actor.ActorSelection$$anonfun$resolveOne$1.apply(ActorSelection.scala:65) > at > akka.actor.ActorSelection$$anonfun$resolveOne$1.apply(ActorSelection.scala:63) > at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32) > at > akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.processBatch$1(BatchingExecutor.scala:67) > at > akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:82) > at > akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59) > at > akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59) > at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72) > at akka.dispatch.BatchingExecutor$Batch.run(BatchingExecutor.scala:58) > at > akka.dispatch.ExecutionContexts$sameThreadExecutionContext$.unbatchedExecute(Future.scala:74) > at akka.dispatch.BatchingExecutor$class.execute(BatchingExecutor.scala:110) > at > akka.dispatch.ExecutionContexts$sameThreadExecutionContext$.execute(Future.scala:73) > at > scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40) > at > scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:248) > at akka.pattern.PromiseActorRef.$bang(AskSupport.scala:267) > at akka.remote.DefaultMessageDispatcher.dispatch(Endpoint.scala:89) > at > akka.remote.EndpointReader$$anonfun$receive$2.applyOrElse(Endpoint.scala:937) > at akka.actor.Actor$class.aroundReceive(Actor.scala:465) > at akka.remote.EndpointActor.aroundReceive(Endpoint.scala:415) > 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) >
