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

Transcript

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

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2. Akka Clusterͱ͸ʁ
   IUUQTUIJOLJUDPKQBSUJDMF
   

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3. Akka Clusterͱ͸ʁ
   Ϋϥελϝϯόʔγοϓ
   ෳ਺ͷϊʔυͰՔಇ͢ΔͷͰ଱ো֐ੑΛ࣋ͭ
   ෛՙ෼ࢄ
   ϧʔςΟϯάʹΑͬͯෛՙ෼ࢄͰ͖Δ
   ϊʔυύʔςΟγϣχϯά
   ಛఆͷϩʔϧͷϊʔυʹͷΈΞΫλʔΛ഑ஔͰ͖Δ
   ύʔςΟγϣϯϙΠϯτ
   ΞΫλʔΛαϒπϦʔʹ෼ׂͯ͠ɺଞͷϊʔυʹ഑ஔͰ͖Δ
   BLLBDMVTUFSϞδϡʔϧ͸্هͷػೳΛఏڙ͢Δ
   

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4. Akka Clusterͱ͸ʁ
   Ϋϥελϝϯόʔγοϓ
   ෳ਺ͷϊʔυͰՔಇ͢ΔͷͰ଱ো֐ੑΛ࣋ͭ
   ෛՙ෼ࢄ
   ϧʔςΟϯάʹΑͬͯෛՙ෼ࢄͰ͖Δ
   ϊʔυύʔςΟγϣχϯά
   ಛఆͷϩʔϧͷϊʔυʹͷΈΞΫλʔΛ഑ஔͰ͖Δ
   ύʔςΟγϣϯϙΠϯτ
   ΞΫλʔΛαϒπϦʔʹ෼ׂͯ͠ɺଞͷϊʔυʹ഑ஔͰ͖Δ
   BLLBDMVTUFSϞδϡʔϧ͸্هͷػೳΛఏڙ͢Δ
   

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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
   

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

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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
   

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8. Ϋϥελͷىಈ-௥Ճ-཭୤ͷྲྀΕ
   TBNQMFDMVTUFS
   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")
   }
   }
   }
   

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9. Ϋϥελͷىಈ-௥Ճ-཭୤ͷྲྀΕ
   ͜Ε·ͰͷྲྀΕΛσϞͰ֬ೝ
   

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10. ϝϯόʔͷϥΠϑαΠΫϧ
    IUUQTEPDBLLBJPEPDTBLLBDPNNPODMVTUFSIUNM
    

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11. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏
    γʔυϊʔυ
    #BDLFOE
    γʔυϊʔυ
    'SPOUFOE
    ϊʔυ
    #BDLFOE
    ϊʔυ
    #BDLFOE
    ϊʔυ
    'SPOUFOE
    'SPOUFOE
    #BDLFOE
    IFMMP+PC*E
    )FMMP+PC*E
    ઌ಄Λେจࣈʹม׵
    ఆظతʹϝοηʔδΛBTL
    

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12. +PCͷ$PVOUFSͰͲͷ#BDLFOEʹׂΓৼΔ͔ܾఆ
    ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏
    'SPOUFOE
    #BDLFOE
    #BDLFOE
    #BDLFOE
    #BDLFOEͷ
    "DUPS3FGͷϦε
    τΛ͍࣋ͬͯΔ
    var backends = IndexedSeq.empty[ActorRef]
    backends(jobCounter % backends.size) forward job
    

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13. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏
    #BDLFOE
    'SPOUFOE
    'SPOUFOE
    $MVTUFSʹ+PJOͨ͠ࡍʹ
    'SPOUFOEʹϝοηʔδΛ
    ૹΔ
    #BDLFOE͔Βϝοηʔδ
    ͕ಧ͍ͨΒɺCBDLFOET
    ʹ௥Ճ͢Δ
    #BDLFOE͔Βϝοηʔδ
    ͕ಧ͍ͨΒɺCBDLFOET
    ʹ௥Ճ͢Δ
    #BDLFOE͕৽نʹΫϥελʹ
    ௥Ճ͞Εͨࡍͷڍಈ
    #BDLFOE3FHJTUSBUJPO
    

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14. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏
    #BDLFOE
    'SPOUFOE
    'SPOUFOE
    'SPOUFOEʹϝοηʔδΛૹΔ
    #BDLFOE͔Βϝοηʔδ
    ͕ಧ͍ͨΒɺCBDLFOET
    ʹ௥Ճ͢Δ
    'SPOUFOE͕৽نʹΫϥελʹ
    ௥Ճ͞Εͨࡍͷڍಈ
    ৽نʹ௥Ճ͞Εͨ'SPOUFOE
    طଘͷ'SPOUFOE
    #BDLFOE3FHJTUSBUJPO
    $MVTUFSʹ৽نͷϊʔυ͕௥Ճ
    ͞Εͨϝοηʔδ͕ඈͿ
    .FNCFS6Q
    

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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
    

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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)
    }
    }
    }
    }
    

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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
    }
    

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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")
    }
    }
    

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19. ClusterͷαϯϓϧΛಈ͔ͯ͠ΈΑ͏
    ͜Ε·ͰͷྲྀΕΛσϞͰ֬ೝ
    

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20. ·ͱΊ
    BQQMJDBUJPODPOGͷઃఆͷΈͰɺDMVTUFSΛ࡞੒͢Δ͜ͱ͕Ͱ
    ͖Δ
    $MVTUFSͷ&WFOUΛTVCTDSJCF͢Δ͜ͱ͕Ͱ͖Δ
    &WFOUʹԊͬͯɺඞཁͳॲཧ͸ࣗલͰॻ͘
    FYCBDLFOET΁ͷొ࿥ͷΈͳͲ
    ͦͷଞʹ΋DMVTUFSJOHͷͨΊͷ৭ʑͳػೳ͕͋Δ
    3PVUJOH
    4IBSEJOH
    FUDʜ
    

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