Akka Cluster 超入門 - 2019 Fringe81 大新年勉強会

Transcript

1. Akka Cluster ௒ೖ໳ 2019 1/9 Fringe81 େ৽೥ษڧձ

2. Akka Clusterͱ͸ʁ IUUQTUIJOLJUDPKQBSUJDMF

3. Akka Clusterͱ͸ʁ  Ϋϥελϝϯόʔγοϓ
    ෳ਺ͷϊʔυͰՔಇ͢ΔͷͰ଱ো֐ੑΛ࣋ͭ
    ෛՙ෼ࢄ
    ϧʔςΟϯάʹΑͬͯෛՙ෼ࢄͰ͖Δ
   

    ϊʔυύʔςΟγϣχϯά
    ಛఆͷϩʔϧͷϊʔυʹͷΈΞΫλʔΛ഑ஔͰ͖Δ
    ύʔςΟγϣϯϙΠϯτ
    ΞΫλʔΛαϒπϦʔʹ෼ׂͯ͠ɺଞͷϊʔυʹ഑ஔͰ͖Δ BLLBDMVTUFS
   Ϟδϡʔϧ͸্هͷػೳΛఏڙ͢Δ

4. Akka Clusterͱ͸ʁ  Ϋϥελϝϯόʔγοϓ
    ෳ਺ͷϊʔυͰՔಇ͢ΔͷͰ଱ো֐ੑΛ࣋ͭ
    ෛՙ෼ࢄ
    ϧʔςΟϯάʹΑͬͯෛՙ෼ࢄͰ͖Δ
   

    ϊʔυύʔςΟγϣχϯά
    ಛఆͷϩʔϧͷϊʔυʹͷΈΞΫλʔΛ഑ஔͰ͖Δ
    ύʔςΟγϣϯϙΠϯτ
    ΞΫλʔΛαϒπϦʔʹ෼ׂͯ͠ɺଞͷϊʔυʹ഑ஔͰ͖Δ BLLBDMVTUFS
   Ϟδϡʔϧ͸্هͷػೳΛఏڙ͢Δ

5. Ϋϥελϝϯόʔγοϓ γʔυϊʔυ γʔυϊʔυ ϊʔυ
   "ϩʔϧ ϊʔυ
   "ϩʔϧ ϊʔυ
   #ϩʔϧ ϊʔυ
   

   #ϩʔϧ  γʔυϊʔυ
    Ϋϥελʔͷ؅ཧΛ࢘Δ
    ϝϯόʔͷ+PJO΍-FBWFͳͲ
    ϊʔυ
    "DUPS͕ಈ͘ϊʔυ
    ϩʔϧͱ͍͏໾ׂ͝ͱͷλ άΈ͍ͨͳ΋ͷΛ෇༩͢Δ ͜ͱ͕Ͱ͖Δ

6. Ϋϥελͷىಈ-௥Ճ-཭୤ͷྲྀΕ γʔυ̍ γʔυ̍ γʔυ γʔυ̍ γʔυ γʔυ γʔυ̍ γʔυ γʔυ͕+PJO

   γʔυ͕+PJO γʔυ͕-FBWF TBNQMFͰಈ͖Λ֬ೝ

7. Ϋϥελͷىಈ-௥Ճ-཭୤ͷྲྀΕ akka { actor { provider = cluster } remote

   { artery { enabled = on transport = tcp canonical.hostname = "127.0.0.1" canonical.port = 0 } } cluster { seed-nodes = [ "akka://ClusterSystem@127.0.0.1:2551", "akka://ClusterSystem@127.0.0.1:2552"] # auto downing is NOT safe for production deployments. # you may want to use it during development, read more about it in the docs. auto-down-unreachable-after = 10s } } BQQMJDBUJPODPOG

8. Ϋϥελͷىಈ-௥Ճ-཭୤ͷྲྀΕ TBNQMF
   DMVTUFS object SimpleClusterApp { def main(args: Array[String]): Unit =

   { if (args.isEmpty) startup(Seq("2551", "2552", "0")) else startup(args) } def startup(ports: Seq[String]): Unit = { ports foreach { port => // Override the configuration of the port val config = ConfigFactory.parseString(s""" akka.remote.artery.canonical.port=$port """).withFallback(ConfigFactory.load()) // Create an Akka system val system = ActorSystem("ClusterSystem", config) // Create an actor that handles cluster domain events system.actorOf(Props[SimpleClusterListener], name = "clusterListener") } } }

9. Ϋϥελͷىಈ-௥Ճ-཭୤ͷྲྀΕ ͜Ε·ͰͷྲྀΕΛσϞͰ֬ೝ

10. ϝϯόʔͷϥΠϑαΠΫϧ IUUQTEPDBLLBJPEPDTBLLBDPNNPODMVTUFSIUNM

11. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏ γʔυϊʔυ
    #BDLFOE γʔυϊʔυ
    'SPOUFOE ϊʔυ
    #BDLFOE ϊʔυ
    #BDLFOE ϊʔυ
    

    'SPOUFOE 'SPOUFOE #BDLFOE IFMMP+PC*E )FMMP+PC*E ઌ಄Λେจࣈʹม׵ ఆظతʹϝοηʔδΛBTL

12. +PCͷ$PVOUFSͰͲͷ#BDLFOEʹׂΓৼΔ͔ܾఆ ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏ 'SPOUFOE #BDLFOE #BDLFOE #BDLFOE #BDLFOEͷ "DUPS3FGͷϦε τΛ͍࣋ͬͯΔ var

    backends = IndexedSeq.empty[ActorRef] backends(jobCounter % backends.size) forward job

13. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏ #BDLFOE 'SPOUFOE 'SPOUFOE $MVTUFSʹ+PJOͨ͠ࡍʹ 'SPOUFOEʹϝοηʔδΛ ૹΔ #BDLFOE͔Βϝοηʔδ ͕ಧ͍ͨΒɺCBDLFOET ʹ௥Ճ͢Δ

    #BDLFOE͔Βϝοηʔδ ͕ಧ͍ͨΒɺCBDLFOET ʹ௥Ճ͢Δ #BDLFOE͕৽نʹΫϥελʹ
    ௥Ճ͞Εͨࡍͷڍಈ #BDLFOE3FHJTUSBUJPO

14. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏ #BDLFOE 'SPOUFOE 'SPOUFOE 'SPOUFOEʹϝοηʔδΛૹΔ #BDLFOE͔Βϝοηʔδ ͕ಧ͍ͨΒɺCBDLFOET ʹ௥Ճ͢Δ 'SPOUFOE͕৽نʹΫϥελʹ
    ௥Ճ͞Εͨࡍͷڍಈ

    ৽نʹ௥Ճ͞Εͨ'SPOUFOE طଘͷ'SPOUFOE #BDLFOE3FHJTUSBUJPO $MVTUFSʹ৽نͷϊʔυ͕௥Ճ ͞Εͨϝοηʔδ͕ඈͿ .FNCFS6Q

15. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏ class TransformationFrontend extends Actor { var backends = IndexedSeq.empty[ActorRef]

    var jobCounter = 0 def receive = { case job: TransformationJob if backends.isEmpty => sender() ! JobFailed("Service unavailable, try again later", job) case job: TransformationJob => jobCounter += 1 backends(jobCounter % backends.size) forward job case BackendRegistration if !backends.contains(sender()) => context watch sender() backends = backends :+ sender() case Terminated(a) => backends = backends.filterNot(_ == a) } } 'SPOUFOEͷίʔυ

16. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏ 'SPOUFOEͷίʔυ object TransformationFrontend { def main(args: Array[String]): Unit =

    { // Override the configuration of the port when specified as program argument val port = if (args.isEmpty) "0" else args(0) val config = ConfigFactory.parseString(s""" akka.remote.artery.canonical.port=$port """) .withFallback(ConfigFactory.parseString("akka.cluster.roles = [frontend]")) .withFallback(ConfigFactory.load()) val system = ActorSystem("ClusterSystem", config) val frontend = system.actorOf(Props[TransformationFrontend], name = "frontend") val counter = new AtomicInteger import system.dispatcher system.scheduler.schedule(2.seconds, 2.seconds) { implicit val timeout = Timeout(5 seconds) (frontend ? TransformationJob("hello-" + counter.incrementAndGet())) onSuccess { case result => println(result) } } } }

17. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏ #BDLFOEͷίʔυ class TransformationBackend extends Actor { val cluster =

    Cluster(context.system) // subscribe to cluster changes, MemberUp // re-subscribe when restart override def preStart(): Unit = cluster.subscribe(self, classOf[MemberUp]) override def postStop(): Unit = cluster.unsubscribe(self) def receive = { case TransformationJob(text) => sender() ! TransformationResult(text.toUpperCase) case state: CurrentClusterState => state.members.filter(_.status == MemberStatus.Up) foreach register case MemberUp(m) => register(m) } def register(member: Member): Unit = if (member.hasRole("frontend")) context.actorSelection(RootActorPath(member.address) / "user" / "frontend") ! BackendRegistration }

18. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏ #BDLFOEͷίʔυ object TransformationBackend { def main(args: Array[String]): Unit =

    { // Override the configuration of the port when specified as program argument val port = if (args.isEmpty) "0" else args(0) val config = ConfigFactory.parseString(s""" akka.remote.artery.canonical.port=$port """) .withFallback(ConfigFactory.parseString("akka.cluster.roles = [backend]")) .withFallback(ConfigFactory.load()) val system = ActorSystem("ClusterSystem", config) system.actorOf(Props[TransformationBackend], name = "backend") } }

19. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏ ͜Ε·ͰͷྲྀΕΛσϞͰ֬ೝ

20. ·ͱΊ  BQQMJDBUJPODPOGͷઃఆͷΈͰɺDMVTUFSΛ࡞੒͢Δ͜ͱ͕Ͱ ͖Δ
     $MVTUFSͷ&WFOUΛTVCTDSJCF͢Δ͜ͱ͕Ͱ͖Δ
     &WFOUʹԊͬͯɺඞཁͳॲཧ͸ࣗલͰॻ͘
     FY
    CBDLFOET΁ͷొ࿥ͷΈͳͲ
    

     ͦͷଞʹ΋DMVTUFSJOHͷͨΊͷ৭ʑͳػೳ͕͋Δ
     3PVUJOH
     4IBSEJOH
     FUDʜ