akka-persistance issue

[Neel Sachdeva]

Hi Guys,

I'm seeing this exception on server :

akka.actor.OneForOneStrategy - 

java.util.NoSuchElementException

        at java.util.LinkedList.removeFirst(LinkedList.java:270)

        at java.util.LinkedList.pop(LinkedList.java:801)

        at akka.persistence.Eventsourced$$anon$2.onWriteMessageComplete(Eventsourced.scala:632)

        at akka.persistence.Eventsourced$ProcessingState$$anonfun$2.applyOrElse(Eventsourced.scala:554)

        at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)

        at akka.persistence.Eventsourced$$anon$2.stateReceive(Eventsourced.scala:628)

        at akka.persistence.Eventsourced$class.aroundReceive(Eventsourced.scala:158)

        at catalyst.actors.subr.Subr.aroundReceive(Subr.scala:242)

        at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)

        at akka.actor.ActorCell.invoke_aroundBody0(ActorCell.scala:495)

        at akka.actor.ActorCell$AjcClosure1.run(ActorCell.scala:1)

        at org.aspectj.runtime.reflect.JoinPointImpl.proceed(JoinPointImpl.java:149)

        at akka.kamon.instrumentation.ActorCellInstrumentation$$anonfun$aroundBehaviourInvoke$1.apply(ActorCellInstrumentation.scala:63)

        at kamon.trace.Tracer$.withContext(TracerModule.scala:53)

        at akka.kamon.instrumentation.ActorCellInstrumentation.aroundBehaviourInvoke(ActorCellInstrumentation.scala:62)

        at akka.actor.ActorCell.invoke(ActorCell.scala:488)

        at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)

        at akka.dispatch.Mailbox.run(Mailbox.scala:224)

        at akka.dispatch.Mailbox.exec(Mailbox.scala:234)

        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)

2015-12-22 14:01:16,876 DEBUG catalyst.actors.subr.Subr - restarting

Problem is being caused at line 632 here https://github.com/akka/akka/blob/master/akka-persistence/src/main/scala/akka/persistence/Eventsourced.scala
Any idea whats happening here ?

[Patrik Nordwall]

That is strange. Do you have a way to reproduce it?

/Patrik

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Patrik Nordwall
Typesafe -  Reactive apps on the JVM
Twitter: @patriknw

[Neel Sachdeva]

Hi Patrik, 

Thank you for responding to it.

No, i don't have a way to reproduce it. It happened two times with us. 

---------------------------------------------------------------------------------

final def persist[A](event: A)(handler: A ⇒ Unit): Unit = {

    pendingStashingPersistInvocations += 1

    pendingInvocations addLast StashingHandlerInvocation(event, handler.asInstanceOf[Any ⇒ Unit])

    resequenceableEventBatch = PersistentRepr(event) :: resequenceableEventBatch

    useProcessorBatching = false

  }

----------------------------------------------------------------------------------

May be somehow this "pendingInvocations addLast StashingHandlerInvocation(event, handler.asInstanceOf[Any ⇒ Unit])"   didn't happen or not sure what was that. Still trying to see what could've caused it.

Cheers | NS

[Patrik Nordwall]

Can you share the code of your PersistentActor?

I would like to see if you are calling the methods of PersistentActor from another thread than the actor's receive thread, e.g. from Future callbacks.