Hi, This might actually be a regression, maybe some initialization code got n^2 unintentionally, and therefore goes wild when used with a large number of actors. I opened a ticket:https://github.com/akka/akka/issues/18613
-Endre On Tue, Sep 29, 2015 at 12:47 PM, gutzeit <[email protected]> wrote: > Dear list members, > > Recently we have upgraded to Akka 2.3.14 and I've noticed a very strange > behaviour. > > Right after startup we start receiving messages on our production > platform, and I the logs I see that it takes several minutes for actors > start processing messages. > Actors in question are part of routers that are defined in the following > way: > > /usersRouter { > router = consistent-hashing-pool > nr-of-instances = 100000 > virtual-nodes-factor = 10 > } > /contactsRouter { > router = consistent-hashing-pool > nr-of-instances = 100000 > virtual-nodes-factor = 10 > } > > Doing jstack in the period that no messages are processed, the only weird > thing i can see is the following: > > java.lang.Thread.State: RUNNABLE > at scala.collection.Iterator$class.foreach(Iterator.scala:727) > at scala.collection.AbstractIterator.foreach(Iterator.scala:1157) > at > scala.collection.IterableLike$class.foreach(IterableLike.scala:72) > at scala.collection.AbstractIterable.foreach(Iterable.scala:54) > at > scala.collection.TraversableLike$class.filter(TraversableLike.scala:263) > at > scala.collection.AbstractTraversable.filter(Traversable.scala:105) > at > scala.collection.TraversableLike$class.filterNot(TraversableLike.scala:274) > at > scala.collection.AbstractTraversable.filterNot(Traversable.scala:105) > at > akka.routing.RoutedActorCell$$anonfun$1.apply(RoutedActorCell.scala:77) > at > akka.routing.RoutedActorCell$$anonfun$1.apply(RoutedActorCell.scala:77) > at > scala.collection.TraversableOnce$$anonfun$foldLeft$1.apply(TraversableOnce.scala:144) > at > scala.collection.TraversableOnce$$anonfun$foldLeft$1.apply(TraversableOnce.scala:144) > at scala.collection.Iterator$class.foreach(Iterator.scala:727) > at scala.collection.AbstractIterator.foreach(Iterator.scala:1157) > at > scala.collection.IterableLike$class.foreach(IterableLike.scala:72) > at scala.collection.AbstractIterable.foreach(Iterable.scala:54) > at > scala.collection.TraversableOnce$class.foldLeft(TraversableOnce.scala:144) > at > scala.collection.AbstractTraversable.foldLeft(Traversable.scala:105) > at > akka.routing.RoutedActorCell.removeRoutees(RoutedActorCell.scala:77) > at akka.routing.ResizablePoolCell.resize(Resizer.scala:288) > at akka.routing.ResizablePoolCell.preSuperStart(Resizer.scala:267) > at akka.routing.RoutedActorCell.start(RoutedActorCell.scala:123) > at akka.routing.RoutedActorCell.start(RoutedActorCell.scala:41) > at > akka.actor.RepointableActorRef.point(RepointableActorRef.scala:105) > at akka.actor.ActorCell.handleSupervise(ActorCell.scala:614) > at akka.actor.ActorCell.supervise(ActorCell.scala:606) > at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:463) > at akka.actor.ActorCell.systemInvoke(ActorCell.scala:478) > at > akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:263) > at akka.dispatch.Mailbox.run(Mailbox.scala:219) > at > akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397) > 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) > > > After that period of "non-processing" is over, that stack trace does not > appear anymore. > > My best guess is that it is somehow related to latest changes to > consistent-hashing pool that was done lately, but then again its just a > guess. > > Does anyone have any clue what is going on ? > > Thanks in advance for your help. > > -- > >>>>>>>>>> Read the docs: http://akka.io/docs/ > >>>>>>>>>> Check the FAQ: > http://doc.akka.io/docs/akka/current/additional/faq.html > >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user > --- > You received this message because you are subscribed to the Google Groups > "Akka User List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. > -- Akka Team Typesafe - Reactive apps on the JVM Blog: letitcrash.com Twitter: @akkateam -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. 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