My program runs for 500 iterations, but fails at about 150 iterations
almostly.
It's hard to explain the details of my program, but i think my program is
ok, for it runs succesfully somtimes. *I just wana know in which situations
this exception will happen*.
The detail error information is as follows:
Exception in thread "main" org.apache.spark.SparkException: Job aborted due
to stage failure: Task 32 in stage 43644.0 failed 4 time
s, most recent failure: Lost task 32.3 in stage 43644.0 (TID 72976,
10.194.117.197): com.esotericsoftware.kryo.KryoException: java.u
til.ConcurrentModificationException
Serialization trace:
classes (sun.misc.Launcher$AppClassLoader)
classloader (java.security.ProtectionDomain)
cachedPDs (javax.security.auth.SubjectDomainCombiner)
combiner (java.security.AccessControlContext)
acc (org.apache.spark.executor.ExecutorURLClassLoader)
classLoader (com.twitter.chill.KryoBase)
kryo (org.apache.spark.serializer.KryoDeserializationStream)
$outer (org.apache.spark.serializer.DeserializationStream$$anon$1)
delegate (org.apache.spark.InterruptibleIterator)
at
com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:585)
at
com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)
at
com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
at
com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568)
at
com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:79)
at
com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:17)
at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)
at
com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
at
com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)
at
com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
at
com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
...
at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)
at
com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
at
com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568)
at
com.twitter.chill.Tuple2Serializer.write(TupleSerializers.scala:37)
at
com.twitter.chill.Tuple2Serializer.write(TupleSerializers.scala:33)
at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568)
at
org.apache.spark.serializer.KryoSerializationStream.writeObject(KryoSerializer.scala:130)
at
org.apache.spark.storage.DiskBlockObjectWriter.write(BlockObjectWriter.scala:195)
at
org.apache.spark.util.collection.ExternalSorter.spillToPartitionFiles(ExternalSorter.scala:370)
at
org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:211)
at
org.apache.spark.shuffle.sort.SortShuffleWriter.write(SortShuffleWriter.scala:63)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:68)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
at org.apache.spark.scheduler.Task.run(Task.scala:56)
at
org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:200)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.util.ConcurrentModificationException
at java.util.Vector$Itr.checkForComodification(Vector.java:1156)
at java.util.Vector$Itr.next(Vector.java:1133)
at
com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:67)
at
com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:18)
at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)
at
com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
... 44 more
Driver stacktrace:
at
org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler
.scala:1214)
at
org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1203)
at
org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1202)
at
scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
at
scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
at
org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1202)
at
org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:696)
at
org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:696)
at scala.Option.foreach(Option.scala:236)
at
org.apache.spark.scheduler.DAGScheduler.handleTaskSetFailed(DAGScheduler.scala:696)
at
org.apache.spark.scheduler.DAGSchedulerEventProcessActor$$anonfun$receive$2.applyOrElse(DAGScheduler.scala:1420)
at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
at
org.apache.spark.scheduler.DAGSchedulerEventProcessActor.aroundReceive(DAGScheduler.scala:1375)
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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