A cluster is just a name for cooperating ActorSystems using a specific protocol. They are not reified.
On Mon, Jul 7, 2014 at 2:56 PM, Ryadh khsib <ryadh.kh...@gmail.com> wrote: > Thanks Martynas! > > It seems that Clusters are a higher level entity: > Cluster -> ActorSystem -> Actor > > AFAIK Clusters are created by ActorSystems when configured to do so which > is probably the source of confusion (lower entity creating a higher entity) > . > > Cheers, > Ryadh > > > On 7 July 2014 12:21, Martynas Mickevičius < > martynas.mickevic...@typesafe.com> wrote: > >> Hi Ryadh, >> >> ActorSystem can only join a Cluster once. >> >> Have you seen the documentation on Cluster Usage? >> http://doc.akka.io/docs/akka/2.3.4/java/cluster-usage.html >> >> The relevant excerpt from that page: >> >> An actor system can only join a cluster once. Additional attempts will be >> ignored. >> When it has successfully joined it must be restarted to be able to join >> another >> cluster or to join the same cluster again. It can use the same host name >> and port >> after the restart, but it must have been removed from the cluster before >> the join >> request is accepted. >> >> So it is not the case that Cluster is deployed on ActorSystem. But rather >> ActorSystem joins a particular Cluster. >> >> >> On Fri, Jul 4, 2014 at 4:23 PM, Ryadh khsib <ryadh.kh...@gmail.com> >> wrote: >> >>> OK we are using a cluster aware router to distribute the load. >>> >>> This means that we have 2 clusters deployed on the same ActorSystem, is >>> that correct? >>> >>> If it is the case, should we deploy each "cluster" in a separate >>> ActorSystem? >>> >>> Ryadh >>> >>> >>> On 4 July 2014 14:20, Patrik Nordwall <patrik.nordw...@gmail.com> wrote: >>> >>>> >>>> >>>> >>>> On Fri, Jul 4, 2014 at 3:10 PM, Ryadh khsib <ryadh.kh...@gmail.com> >>>> wrote: >>>> >>>>> I mean we deployed within the same actor system: >>>>> - singleton actor: scheduled task >>>>> - router: the singleton distributed the work to workers using a router >>>>> >>>>> I presume to implement a Singleton actor, some sort of Cluster is >>>>> needed. >>>>> >>>> >>>> Yes >>>> >>>> >>>>> The same thing applies for setting up a router. >>>>> >>>> >>>> well, you can have local routers: >>>> http://doc.akka.io/docs/akka/2.3.4/java/routing.html >>>> but for cluster aware routers you need a cluster, that is right >>>> >>>> /Patrik >>>> >>>> >>>>> >>>>> I am totally wrong? >>>>> >>>>> Thanks, >>>>> Ryadh >>>>> >>>>> >>>>> On 4 July 2014 10:40, Patrik Nordwall <patrik.nordw...@gmail.com> >>>>> wrote: >>>>> >>>>>> >>>>>> >>>>>> >>>>>> On Fri, Jul 4, 2014 at 11:12 AM, Ryadh khsib <riadh.kh...@gmail.com> >>>>>> wrote: >>>>>> >>>>>>> Hi Patrik, >>>>>>> Reading this: >>>>>>> >>>>>>>> An ActorSystem can only be part of one cluster, and only once. >>>>>>>> Rejoining or joining of two different clusters are not supported. Then >>>>>>>> the >>>>>>>> ActorSystem must be stopped and started again to join the cluster. >>>>>>>> >>>>>>>> /Patrik >>>>>>>> >>>>>>> >>>>>>> Do you confirm that for every Cluster an new ActorSytem should be >>>>>>> created? >>>>>>> >>>>>> >>>>>> An ActorSystem is created locally, in the JVM of each machine. We >>>>>> often refer to this as a cluster node, or a cluster member. >>>>>> A Cluster is a set of nodes (actor systems) working together. >>>>>> >>>>>> >>>>>>> We are using a singleton and router clusters within the same >>>>>>> ActorSystem. Would you recommend to create 2 actor systems? >>>>>>> >>>>>> >>>>>> I don't understand what you mean with "singleton and router >>>>>> clusters", but I assume that mean that you use Cluster Singelton >>>>>> <http://doc.akka.io/docs/akka/2.3.4/scala/cluster-usage.html#Cluster_Singleton> >>>>>> and Cluster Aware Routers >>>>>> <http://doc.akka.io/docs/akka/2.3.4/scala/cluster-usage.html#Cluster_Aware_Routers>. >>>>>> You can use these two features the same ActorSystem. >>>>>> >>>>>> /Patrik >>>>>> >>>>>> >>>>>>> >>>>>>> Thanks, >>>>>>> Ryadh >>>>>>> >>>>>>> >>>>>>> On Friday, July 4, 2014 8:38:47 AM UTC+1, Patrik Nordwall wrote: >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Thu, Jul 3, 2014 at 10:28 PM, Eugene Dzhurinsky < >>>>>>>> jdev...@gmail.com> wrote: >>>>>>>> >>>>>>>>> So you had one cluster consisting of all nodes, and then a network >>>>>>>>>> split caused it to be split into two separate clusters? >>>>>>>>>> That does not really have anything to do with seed nodes. Seed >>>>>>>>>> nodes are only used as initial contact points when joining new nodes. >>>>>>>>>> >>>>>>>>> >>>>>>>>> Hi! >>>>>>>>> >>>>>>>>> Let's assume there are 3 nodes - A, B and C. Node A is a seed node >>>>>>>>> for B and C. So when cluster starts - B joins A and C joins A, then >>>>>>>>> they >>>>>>>>> gossip and then B knows about C and vise versa. >>>>>>>>> >>>>>>>> yes, then my understanding was correct >>>>>>>> >>>>>>>>> >>>>>>>>> Now A is not reachable, so both B and C mark it as "quarantined". >>>>>>>>> After A gets online - it doesn't know neither about B nor about C, >>>>>>>>> and none >>>>>>>>> of the nodes B and C will even try to restore the connections to A. >>>>>>>>> >>>>>>>> quarantine is because of downing: http://doc.akka.io/docs/akka/ >>>>>>>> 2.3.4/scala/cluster-usage.html#Automatic_vs__Manual_Downing >>>>>>>> >>>>>>>>> >>>>>>>>> If A has some "actors" to be deployed on node B - then it will not >>>>>>>>> be able to do so. >>>>>>>>> >>>>>>>>> The only way to resolve this seems to make A, B and C as "seed" >>>>>>>>> nodes, so if any of then will "disconnect" - then after the >>>>>>>>> connection is >>>>>>>>> established (and threshold is not broken yet) they will re-join. But >>>>>>>>> I'm >>>>>>>>> not sure if there would be a delay in startup of node B - will it be >>>>>>>>> marked >>>>>>>>> as inaccessible? >>>>>>>>> >>>>>>>> >>>>>>>> I repeat myself, this has nothing to do with seed nodes. Please >>>>>>>> re-read my previous reply, and this section: http://doc.akka.io/ >>>>>>>> docs/akka/2.3.4/scala/cluster-usage.html#Joining_to_Seed_Nodes >>>>>>>> >>>>>>>> /Patrik >>>>>>>> >>>>>>>> >>>>>>>>> -- >>>>>>>>> >>>>>>>>>> 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 akka-user+...@googlegroups.com. >>>>>>>>> To post to this group, send email to akka...@googlegroups.com. >>>>>>>>> >>>>>>>>> Visit this group at http://groups.google.com/group/akka-user. >>>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> >>>>>>>> Patrik Nordwall >>>>>>>> Typesafe <http://typesafe.com/> - Reactive apps on the JVM >>>>>>>> Twitter: @patriknw >>>>>>>> >>>>>>>> -- >>>>>>> >>>>>>>>>> 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 akka-user+unsubscr...@googlegroups.com. >>>>>>> >>>>>>> To post to this group, send email to akka-user@googlegroups.com. >>>>>>> Visit this group at http://groups.google.com/group/akka-user. >>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> >>>>>> Patrik Nordwall >>>>>> Typesafe <http://typesafe.com/> - Reactive apps on the JVM >>>>>> Twitter: @patriknw >>>>>> >>>>>> -- >>>>>> >>>>>>>>>> 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 a topic in >>>>>> the Google Groups "Akka User List" group. >>>>>> To unsubscribe from this topic, visit >>>>>> https://groups.google.com/d/topic/akka-user/2PnY31IgGEg/unsubscribe. >>>>>> To unsubscribe from this group and all its topics, send an email to >>>>>> akka-user+unsubscr...@googlegroups.com. >>>>>> >>>>>> To post to this group, send email to akka-user@googlegroups.com. >>>>>> Visit this group at http://groups.google.com/group/akka-user. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> *Ryadh Khsib* >>>>> Software Engineer >>>>> >>>>> email: ryadh.kh...@gmail.com >>>>> >>>>> -- >>>>> >>>>>>>>>> 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 akka-user+unsubscr...@googlegroups.com. >>>>> To post to this group, send email to akka-user@googlegroups.com. >>>>> Visit this group at http://groups.google.com/group/akka-user. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> >>>> >>>> >>>> -- >>>> >>>> Patrik Nordwall >>>> Typesafe <http://typesafe.com/> - Reactive apps on the JVM >>>> Twitter: @patriknw >>>> >>>> -- >>>> >>>>>>>>>> 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 a topic in the >>>> Google Groups "Akka User List" group. >>>> To unsubscribe from this topic, visit >>>> https://groups.google.com/d/topic/akka-user/2PnY31IgGEg/unsubscribe. >>>> To unsubscribe from this group and all its topics, send an email to >>>> akka-user+unsubscr...@googlegroups.com. >>>> To post to this group, send email to akka-user@googlegroups.com. >>>> Visit this group at http://groups.google.com/group/akka-user. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> >>> >>> -- >>> *Ryadh Khsib* >>> Software Engineer >>> >>> email: ryadh.kh...@gmail.com >>> >>> -- >>> >>>>>>>>>> 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 akka-user+unsubscr...@googlegroups.com. >>> To post to this group, send email to akka-user@googlegroups.com. >>> Visit this group at http://groups.google.com/group/akka-user. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> >> -- >> Martynas Mickevičius >> Typesafe <http://typesafe.com/> – Reactive >> <http://www.reactivemanifesto.org/> Apps on the JVM >> >> -- >> >>>>>>>>>> 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 a topic in the >> Google Groups "Akka User List" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/akka-user/2PnY31IgGEg/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> akka-user+unsubscr...@googlegroups.com. >> To post to this group, send email to akka-user@googlegroups.com. >> Visit this group at http://groups.google.com/group/akka-user. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > *Ryadh Khsib* > Software Engineer > > email: ryadh.kh...@gmail.com > > -- > >>>>>>>>>> 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 akka-user+unsubscr...@googlegroups.com. > To post to this group, send email to akka-user@googlegroups.com. > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. > -- Cheers, √ -- >>>>>>>>>> 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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