Default configuration

Each Akka module has a reference.conf file with the default values.

Make your edits/overrides in your application.conf. Don’t override default values if you are not sure of the implications. Akka Config Checker is a useful tool for finding potential configuration issues.

The purpose of reference.conf files is for libraries, like Akka, to define default values that are used if an application doesn’t define a more specific value. It’s also a good place to document the existence and meaning of the configuration properties. One library must not try to override properties in its own reference.conf for properties originally defined by another library’s reference.conf, because the effective value would be nondeterministic when loading the configuration.`

akka-actor

####################################
# Akka Actor Reference Config File #
####################################

# This is the reference config file that contains all the default settings.
# Make your edits/overrides in your application.conf.

# Akka version, checked against the runtime version of Akka. Loaded from generated conf file.
include "version"

akka {
  # Home directory of Akka, modules in the deploy directory will be loaded
  home = ""

  # Loggers to register at boot time (akka.event.Logging$DefaultLogger logs
  # to STDOUT)
  loggers = ["akka.event.Logging$DefaultLogger"]

  # Filter of log events that is used by the LoggingAdapter before
  # publishing log events to the eventStream. It can perform
  # fine grained filtering based on the log source. The default
  # implementation filters on the `loglevel`.
  # FQCN of the LoggingFilter. The Class of the FQCN must implement
  # akka.event.LoggingFilter and have a public constructor with
  # (akka.actor.ActorSystem.Settings, akka.event.EventStream) parameters.
  logging-filter = "akka.event.DefaultLoggingFilter"

  # Specifies the default loggers dispatcher
  loggers-dispatcher = "akka.actor.default-dispatcher"

  # Loggers are created and registered synchronously during ActorSystem
  # start-up, and since they are actors, this timeout is used to bound the
  # waiting time
  logger-startup-timeout = 5s

  # Log level used by the configured loggers (see "loggers") as soon
  # as they have been started; before that, see "stdout-loglevel"
  # Options: OFF, ERROR, WARNING, INFO, DEBUG
  loglevel = "INFO"

  # Log level for the very basic logger activated during ActorSystem startup.
  # This logger prints the log messages to stdout (System.out).
  # Options: OFF, ERROR, WARNING, INFO, DEBUG
  stdout-loglevel = "WARNING"

  # Log the complete configuration at INFO level when the actor system is started.
  # This is useful when you are uncertain of what configuration is used.
  log-config-on-start = off

  # Log at info level when messages are sent to dead letters.
  # Possible values:
  # on: all dead letters are logged
  # off: no logging of dead letters
  # n: positive integer, number of dead letters that will be logged
  log-dead-letters = 10

  # Possibility to turn off logging of dead letters while the actor system
  # is shutting down. Logging is only done when enabled by 'log-dead-letters'
  # setting.
  log-dead-letters-during-shutdown = off

  # When log-dead-letters is enabled, this will re-enable the logging after configured duration.
  # infinite: suspend the logging forever;
  # or a duration (eg: 5 minutes), after which the logging will be re-enabled.
  log-dead-letters-suspend-duration = 5 minutes

  # List FQCN of extensions which shall be loaded at actor system startup.
  # Library extensions are regular extensions that are loaded at startup and are
  # available for third party library authors to enable auto-loading of extensions when
  # present on the classpath. This is done by appending entries:
  # 'library-extensions += "Extension"' in the library `reference.conf`.
  #
  # Should not be set by end user applications in 'application.conf', use the extensions property for that
  #
  library-extensions = ${?akka.library-extensions} ["akka.serialization.SerializationExtension"]

  # List FQCN of extensions which shall be loaded at actor system startup.
  # Should be on the format: 'extensions = ["foo", "bar"]' etc.
  # See the Akka Documentation for more info about Extensions
  extensions = []

  # Toggles whether threads created by this ActorSystem should be daemons or not
  daemonic = off

  # JVM shutdown, System.exit(-1), in case of a fatal error,
  # such as OutOfMemoryError
  jvm-exit-on-fatal-error = on

  # Akka installs JVM shutdown hooks by default, e.g. in CoordinatedShutdown and Artery. This property will
  # not disable user-provided hooks registered using `CoordinatedShutdown#addCancellableJvmShutdownHook`.
  # This property is related to `akka.coordinated-shutdown.run-by-jvm-shutdown-hook` below.
  # This property makes it possible to disable all such hooks if the application itself
  # or a higher level framework such as Play prefers to install the JVM shutdown hook and
  # terminate the ActorSystem itself, with or without using CoordinatedShutdown.
  jvm-shutdown-hooks = on

  # Version must be the same across all modules and if they are different the startup
  # will fail. It's possible but not recommended, to disable this check, and only log a warning,
  # by setting this property to `off`.
  fail-mixed-versions = on

  actor {

    # Either one of "local", "remote" or "cluster" or the
    # FQCN of the ActorRefProvider to be used; the below is the built-in default,
    # note that "remote" and "cluster" requires the akka-remote and akka-cluster
    # artifacts to be on the classpath.
    provider = "local"

    # The guardian "/user" will use this class to obtain its supervisorStrategy.
    # It needs to be a subclass of akka.actor.SupervisorStrategyConfigurator.
    # In addition to the default there is akka.actor.StoppingSupervisorStrategy.
    guardian-supervisor-strategy = "akka.actor.DefaultSupervisorStrategy"

    # Timeout for ActorSystem.actorOf
    creation-timeout = 20s

    # Serializes and deserializes (non-primitive) messages to ensure immutability,
    # this is only intended for testing.
    serialize-messages = off

    # Serializes and deserializes creators (in Props) to ensure that they can be
    # sent over the network, this is only intended for testing. Purely local deployments
    # as marked with deploy.scope == LocalScope are exempt from verification.
    serialize-creators = off

    # If serialize-messages or serialize-creators are enabled classes that starts with
    # a prefix listed here are not verified.
    no-serialization-verification-needed-class-prefix = ["akka."]

    # Timeout for send operations to top-level actors which are in the process
    # of being started. This is only relevant if using a bounded mailbox or the
    # CallingThreadDispatcher for a top-level actor.
    unstarted-push-timeout = 10s

    typed {
      # Default timeout for typed actor methods with non-void return type
      timeout = 5s
    }

    # Mapping between ´deployment.router' short names to fully qualified class names
    router.type-mapping {
      from-code = "akka.routing.NoRouter"
      round-robin-pool = "akka.routing.RoundRobinPool"
      round-robin-group = "akka.routing.RoundRobinGroup"
      random-pool = "akka.routing.RandomPool"
      random-group = "akka.routing.RandomGroup"
      balancing-pool = "akka.routing.BalancingPool"
      smallest-mailbox-pool = "akka.routing.SmallestMailboxPool"
      broadcast-pool = "akka.routing.BroadcastPool"
      broadcast-group = "akka.routing.BroadcastGroup"
      scatter-gather-pool = "akka.routing.ScatterGatherFirstCompletedPool"
      scatter-gather-group = "akka.routing.ScatterGatherFirstCompletedGroup"
      tail-chopping-pool = "akka.routing.TailChoppingPool"
      tail-chopping-group = "akka.routing.TailChoppingGroup"
      consistent-hashing-pool = "akka.routing.ConsistentHashingPool"
      consistent-hashing-group = "akka.routing.ConsistentHashingGroup"
    }

    deployment {

      # deployment id pattern - on the format: /parent/child etc.
      default {

        # The id of the dispatcher to use for this actor.
        # If undefined or empty the dispatcher specified in code
        # (Props.withDispatcher) is used, or default-dispatcher if not
        # specified at all.
        dispatcher = ""

        # The id of the mailbox to use for this actor.
        # If undefined or empty the default mailbox of the configured dispatcher
        # is used or if there is no mailbox configuration the mailbox specified
        # in code (Props.withMailbox) is used.
        # If there is a mailbox defined in the configured dispatcher then that
        # overrides this setting.
        mailbox = ""

        # routing (load-balance) scheme to use
        # - available: "from-code", "round-robin", "random", "smallest-mailbox",
        #              "scatter-gather", "broadcast"
        # - or:        Fully qualified class name of the router class.
        #              The class must extend akka.routing.CustomRouterConfig and
        #              have a public constructor with com.typesafe.config.Config
        #              and optional akka.actor.DynamicAccess parameter.
        # - default is "from-code";
        # Whether or not an actor is transformed to a Router is decided in code
        # only (Props.withRouter). The type of router can be overridden in the
        # configuration; specifying "from-code" means that the values specified
        # in the code shall be used.
        # In case of routing, the actors to be routed to can be specified
        # in several ways:
        # - nr-of-instances: will create that many children
        # - routees.paths: will route messages to these paths using ActorSelection,
        #   i.e. will not create children
        # - resizer: dynamically resizable number of routees as specified in
        #   resizer below
        router = "from-code"

        # number of children to create in case of a router;
        # this setting is ignored if routees.paths is given
        nr-of-instances = 1

        # within is the timeout used for routers containing future calls
        within = 5 seconds

        # number of virtual nodes per node for consistent-hashing router
        virtual-nodes-factor = 10

        tail-chopping-router {
          # interval is duration between sending message to next routee
          interval = 10 milliseconds
        }

        routees {
          # Alternatively to giving nr-of-instances you can specify the full
          # paths of those actors which should be routed to. This setting takes
          # precedence over nr-of-instances
          paths = []
        }

        # To use a dedicated dispatcher for the routees of the pool you can
        # define the dispatcher configuration inline with the property name
        # 'pool-dispatcher' in the deployment section of the router.
        # For example:
        # pool-dispatcher {
        #   fork-join-executor.parallelism-min = 5
        #   fork-join-executor.parallelism-max = 5
        # }

        # Routers with dynamically resizable number of routees; this feature is
        # enabled by including (parts of) this section in the deployment
        resizer {

          enabled = off

          # The fewest number of routees the router should ever have.
          lower-bound = 1

          # The most number of routees the router should ever have.
          # Must be greater than or equal to lower-bound.
          upper-bound = 10

          # Threshold used to evaluate if a routee is considered to be busy
          # (under pressure). Implementation depends on this value (default is 1).
          # 0:   number of routees currently processing a message.
          # 1:   number of routees currently processing a message has
          #      some messages in mailbox.
          # > 1: number of routees with at least the configured pressure-threshold
          #      messages in their mailbox. Note that estimating mailbox size of
          #      default UnboundedMailbox is O(N) operation.
          pressure-threshold = 1

          # Percentage to increase capacity whenever all routees are busy.
          # For example, 0.2 would increase 20% (rounded up), i.e. if current
          # capacity is 6 it will request an increase of 2 more routees.
          rampup-rate = 0.2

          # Minimum fraction of busy routees before backing off.
          # For example, if this is 0.3, then we'll remove some routees only when
          # less than 30% of routees are busy, i.e. if current capacity is 10 and
          # 3 are busy then the capacity is unchanged, but if 2 or less are busy
          # the capacity is decreased.
          # Use 0.0 or negative to avoid removal of routees.
          backoff-threshold = 0.3

          # Fraction of routees to be removed when the resizer reaches the
          # backoffThreshold.
          # For example, 0.1 would decrease 10% (rounded up), i.e. if current
          # capacity is 9 it will request an decrease of 1 routee.
          backoff-rate = 0.1

          # Number of messages between resize operation.
          # Use 1 to resize before each message.
          messages-per-resize = 10
        }

        # Routers with dynamically resizable number of routees based on
        # performance metrics.
        # This feature is enabled by including (parts of) this section in
        # the deployment, cannot be enabled together with default resizer.
        optimal-size-exploring-resizer {

          enabled = off

          # The fewest number of routees the router should ever have.
          lower-bound = 1

          # The most number of routees the router should ever have.
          # Must be greater than or equal to lower-bound.
          upper-bound = 10

          # probability of doing a ramping down when all routees are busy
          # during exploration.
          chance-of-ramping-down-when-full = 0.2

          # Interval between each resize attempt
          action-interval = 5s

          # If the routees have not been fully utilized (i.e. all routees busy)
          # for such length, the resizer will downsize the pool.
          downsize-after-underutilized-for = 72h

          # Duration exploration, the ratio between the largest step size and
          # current pool size. E.g. if the current pool size is 50, and the
          # explore-step-size is 0.1, the maximum pool size change during
          # exploration will be +- 5
          explore-step-size = 0.1

          # Probability of doing an exploration v.s. optmization.
          chance-of-exploration = 0.4

          # When downsizing after a long streak of underutilization, the resizer
          # will downsize the pool to the highest utiliziation multiplied by a
          # a downsize ratio. This downsize ratio determines the new pools size
          # in comparison to the highest utilization.
          # E.g. if the highest utilization is 10, and the down size ratio
          # is 0.8, the pool will be downsized to 8
          downsize-ratio = 0.8

          # When optimizing, the resizer only considers the sizes adjacent to the
          # current size. This number indicates how many adjacent sizes to consider.
          optimization-range = 16

          # The weight of the latest metric over old metrics when collecting
          # performance metrics.
          # E.g. if the last processing speed is 10 millis per message at pool
          # size 5, and if the new processing speed collected is 6 millis per
          # message at pool size 5. Given a weight of 0.3, the metrics
          # representing pool size 5 will be 6 * 0.3 + 10 * 0.7, i.e. 8.8 millis
          # Obviously, this number should be between 0 and 1.
          weight-of-latest-metric = 0.5
        }
      }

      "/IO-DNS/inet-address" {
        mailbox = "unbounded"
        router = "consistent-hashing-pool"
        nr-of-instances = 4
      }

      "/IO-DNS/inet-address/*" {
        dispatcher = "akka.actor.default-blocking-io-dispatcher"
      }

      "/IO-DNS/async-dns" {
        mailbox = "unbounded"
        router = "round-robin-pool"
        nr-of-instances = 1
      }
    }

    default-dispatcher {
      # Must be one of the following
      # Dispatcher, PinnedDispatcher, or a FQCN to a class inheriting
      # MessageDispatcherConfigurator with a public constructor with
      # both com.typesafe.config.Config parameter and
      # akka.dispatch.DispatcherPrerequisites parameters.
      # PinnedDispatcher must be used together with executor=thread-pool-executor.
      type = "Dispatcher"

      # Which kind of ExecutorService to use for this dispatcher
      # Valid options:
      #  - "default-executor" requires a "default-executor" section
      #  - "fork-join-executor" requires a "fork-join-executor" section
      #  - "thread-pool-executor" requires a "thread-pool-executor" section
      #  - "affinity-pool-executor" requires an "affinity-pool-executor" section
      #  - A FQCN of a class extending ExecutorServiceConfigurator
      executor = "default-executor"

      # This will be used if you have set "executor = "default-executor"".
      # If an ActorSystem is created with a given ExecutionContext, this
      # ExecutionContext will be used as the default executor for all
      # dispatchers in the ActorSystem configured with
      # executor = "default-executor". Note that "default-executor"
      # is the default value for executor, and therefore used if not
      # specified otherwise. If no ExecutionContext is given,
      # the executor configured in "fallback" will be used.
      default-executor {
        fallback = "fork-join-executor"
      }

      # This will be used if you have set "executor = "affinity-pool-executor""
      # Underlying thread pool implementation is akka.dispatch.affinity.AffinityPool.
      # This executor is classified as "ApiMayChange".
      affinity-pool-executor {
        # Min number of threads to cap factor-based parallelism number to
        parallelism-min = 4

        # The parallelism factor is used to determine thread pool size using the
        # following formula: ceil(available processors * factor). Resulting size
        # is then bounded by the parallelism-min and parallelism-max values.
        parallelism-factor = 0.8

        # Max number of threads to cap factor-based parallelism number to.
        parallelism-max = 64

        # Each worker in the pool uses a separate bounded MPSC queue. This value
        # indicates the upper bound of the queue. Whenever an attempt to enqueue
        # a task is made and the queue does not have capacity to accommodate
        # the task, the rejection handler created by the rejection handler specified
        # in "rejection-handler" is invoked.
        task-queue-size = 512

        # FQCN of the Rejection handler used in the pool.
        # Must have an empty public constructor and must
        # implement akka.actor.affinity.RejectionHandlerFactory.
        rejection-handler = "akka.dispatch.affinity.ThrowOnOverflowRejectionHandler"

        # Level of CPU time used, on a scale between 1 and 10, during backoff/idle.
        # The tradeoff is that to have low latency more CPU time must be used to be
        # able to react quickly on incoming messages or send as fast as possible after
        # backoff backpressure.
        # Level 1 strongly prefer low CPU consumption over low latency.
        # Level 10 strongly prefer low latency over low CPU consumption.
        idle-cpu-level = 5

        # FQCN of the akka.dispatch.affinity.QueueSelectorFactory.
        # The Class of the FQCN must have a public constructor with a
        # (com.typesafe.config.Config) parameter.
        # A QueueSelectorFactory create instances of akka.dispatch.affinity.QueueSelector,
        # that is responsible for determining which task queue a Runnable should be enqueued in.
        queue-selector = "akka.dispatch.affinity.FairDistributionHashCache"

        # When using the "akka.dispatch.affinity.FairDistributionHashCache" queue selector
        # internally the AffinityPool uses two methods to determine which task
        # queue to allocate a Runnable to:
        # - map based - maintains a round robin counter and a map of Runnable
        # hashcodes to queues that they have been associated with. This ensures
        # maximum fairness in terms of work distribution, meaning that each worker
        # will get approximately equal amount of mailboxes to execute. This is suitable
        # in cases where we have a small number of actors that will be scheduled on
        # the pool and we want to ensure the maximum possible utilization of the
        # available threads.
        # - hash based - the task - queue in which the runnable should go is determined
        # by using an uniformly distributed int to int hash function which uses the
        # hash code of the Runnable as an input. This is preferred in situations where we
        # have enough number of distinct actors to ensure statistically uniform
        # distribution of work across threads or we are ready to sacrifice the
        # former for the added benefit of avoiding map look-ups.
        fair-work-distribution {
          # The value serves as a threshold which determines the point at which the
          # pool switches from the first to the second work distribution schemes.
          # For example, if the value is set to 128, the pool can observe up to
          # 128 unique actors and schedule their mailboxes using the map based
          # approach. Once this number is reached the pool switches to hash based
          # task distribution mode. If the value is set to 0, the map based
          # work distribution approach is disabled and only the hash based is
          # used irrespective of the number of unique actors. Valid range is
          # 0 to 2048 (inclusive)
          threshold = 128
        }
      }

      # This will be used if you have set "executor = "fork-join-executor""
      # Underlying thread pool implementation is java.util.concurrent.ForkJoinPool
      fork-join-executor {
        # Min number of threads to cap factor-based parallelism number to
        parallelism-min = 8

        # The parallelism factor is used to determine thread pool size using the
        # following formula: ceil(available processors * factor). Resulting size
        # is then bounded by the parallelism-min and parallelism-max values.
        parallelism-factor = 1.0

        # Max number of threads to cap factor-based parallelism number to
        parallelism-max = 64

        # Setting to "FIFO" to use queue like peeking mode which "poll" or "LIFO" to use stack
        # like peeking mode which "pop".
        task-peeking-mode = "FIFO"
      }

      # This will be used if you have set "executor = "thread-pool-executor""
      # Underlying thread pool implementation is java.util.concurrent.ThreadPoolExecutor
      thread-pool-executor {
        # Keep alive time for threads
        keep-alive-time = 60s

        # Define a fixed thread pool size with this property. The corePoolSize
        # and the maximumPoolSize of the ThreadPoolExecutor will be set to this
        # value, if it is defined. Then the other pool-size properties will not
        # be used.
        #
        # Valid values are: `off` or a positive integer.
        fixed-pool-size = off

        # Min number of threads to cap factor-based corePoolSize number to
        core-pool-size-min = 8

        # The core-pool-size-factor is used to determine corePoolSize of the
        # ThreadPoolExecutor using the following formula:
        # ceil(available processors * factor).
        # Resulting size is then bounded by the core-pool-size-min and
        # core-pool-size-max values.
        core-pool-size-factor = 3.0

        # Max number of threads to cap factor-based corePoolSize number to
        core-pool-size-max = 64

        # Minimum number of threads to cap factor-based maximumPoolSize number to
        max-pool-size-min = 8

        # The max-pool-size-factor is used to determine maximumPoolSize of the
        # ThreadPoolExecutor using the following formula:
        # ceil(available processors * factor)
        # The maximumPoolSize will not be less than corePoolSize.
        # It is only used if using a bounded task queue.
        max-pool-size-factor  = 3.0

        # Max number of threads to cap factor-based maximumPoolSize number to
        max-pool-size-max = 64

        # Specifies the bounded capacity of the task queue (< 1 == unbounded)
        task-queue-size = -1

        # Specifies which type of task queue will be used, can be "array" or
        # "linked" (default)
        task-queue-type = "linked"

        # Allow core threads to time out
        allow-core-timeout = on
      }

      # How long time the dispatcher will wait for new actors until it shuts down
      shutdown-timeout = 1s

      # Throughput defines the number of messages that are processed in a batch
      # before the thread is returned to the pool. Set to 1 for as fair as possible.
      throughput = 5

      # Throughput deadline for Dispatcher, set to 0 or negative for no deadline
      throughput-deadline-time = 0ms

      # For BalancingDispatcher: If the balancing dispatcher should attempt to
      # schedule idle actors using the same dispatcher when a message comes in,
      # and the dispatchers ExecutorService is not fully busy already.
      attempt-teamwork = on

      # If this dispatcher requires a specific type of mailbox, specify the
      # fully-qualified class name here; the actually created mailbox will
      # be a subtype of this type. The empty string signifies no requirement.
      mailbox-requirement = ""
    }

    # Default separate internal dispatcher to run Akka internal tasks and actors on
    # protecting them against starvation because of accidental blocking in user actors (which run on the
    # default dispatcher)
    internal-dispatcher {
      type = "Dispatcher"
      executor = "fork-join-executor"
      throughput = 5
      fork-join-executor {
        parallelism-min = 4
        parallelism-factor = 1.0
        parallelism-max = 64
      }
    }

    default-blocking-io-dispatcher {
      type = "Dispatcher"
      executor = "thread-pool-executor"
      throughput = 1

      thread-pool-executor {
        fixed-pool-size = 16
      }
    }

    default-mailbox {
      # FQCN of the MailboxType. The Class of the FQCN must have a public
      # constructor with
      # (akka.actor.ActorSystem.Settings, com.typesafe.config.Config) parameters.
      mailbox-type = "akka.dispatch.UnboundedMailbox"

      # If the mailbox is bounded then it uses this setting to determine its
      # capacity. The provided value must be positive.
      # NOTICE:
      # Up to version 2.1 the mailbox type was determined based on this setting;
      # this is no longer the case, the type must explicitly be a bounded mailbox.
      mailbox-capacity = 1000

      # If the mailbox is bounded then this is the timeout for enqueueing
      # in case the mailbox is full. Negative values signify infinite
      # timeout, which should be avoided as it bears the risk of dead-lock.
      mailbox-push-timeout-time = 10s

      # For Actor with Stash: The default capacity of the stash.
      # If negative (or zero) then an unbounded stash is used (default)
      # If positive then a bounded stash is used and the capacity is set using
      # the property
      stash-capacity = -1
    }

    mailbox {
      # Mapping between message queue semantics and mailbox configurations.
      # Used by akka.dispatch.RequiresMessageQueue[T] to enforce different
      # mailbox types on actors.
      # If your Actor implements RequiresMessageQueue[T], then when you create
      # an instance of that actor its mailbox type will be decided by looking
      # up a mailbox configuration via T in this mapping
      requirements {
        "akka.dispatch.UnboundedMessageQueueSemantics" =
          akka.actor.mailbox.unbounded-queue-based
        "akka.dispatch.BoundedMessageQueueSemantics" =
          akka.actor.mailbox.bounded-queue-based
        "akka.dispatch.DequeBasedMessageQueueSemantics" =
          akka.actor.mailbox.unbounded-deque-based
        "akka.dispatch.UnboundedDequeBasedMessageQueueSemantics" =
          akka.actor.mailbox.unbounded-deque-based
        "akka.dispatch.BoundedDequeBasedMessageQueueSemantics" =
          akka.actor.mailbox.bounded-deque-based
        "akka.dispatch.MultipleConsumerSemantics" =
          akka.actor.mailbox.unbounded-queue-based
        "akka.dispatch.ControlAwareMessageQueueSemantics" =
          akka.actor.mailbox.unbounded-control-aware-queue-based
        "akka.dispatch.UnboundedControlAwareMessageQueueSemantics" =
          akka.actor.mailbox.unbounded-control-aware-queue-based
        "akka.dispatch.BoundedControlAwareMessageQueueSemantics" =
          akka.actor.mailbox.bounded-control-aware-queue-based
        "akka.event.LoggerMessageQueueSemantics" =
          akka.actor.mailbox.logger-queue
      }

      unbounded-queue-based {
        # FQCN of the MailboxType, The Class of the FQCN must have a public
        # constructor with (akka.actor.ActorSystem.Settings,
        # com.typesafe.config.Config) parameters.
        mailbox-type = "akka.dispatch.UnboundedMailbox"
      }

      bounded-queue-based {
        # FQCN of the MailboxType, The Class of the FQCN must have a public
        # constructor with (akka.actor.ActorSystem.Settings,
        # com.typesafe.config.Config) parameters.
        mailbox-type = "akka.dispatch.BoundedMailbox"
      }

      unbounded-deque-based {
        # FQCN of the MailboxType, The Class of the FQCN must have a public
        # constructor with (akka.actor.ActorSystem.Settings,
        # com.typesafe.config.Config) parameters.
        mailbox-type = "akka.dispatch.UnboundedDequeBasedMailbox"
      }

      bounded-deque-based {
        # FQCN of the MailboxType, The Class of the FQCN must have a public
        # constructor with (akka.actor.ActorSystem.Settings,
        # com.typesafe.config.Config) parameters.
        mailbox-type = "akka.dispatch.BoundedDequeBasedMailbox"
      }

      unbounded-control-aware-queue-based {
        # FQCN of the MailboxType, The Class of the FQCN must have a public
        # constructor with (akka.actor.ActorSystem.Settings,
        # com.typesafe.config.Config) parameters.
        mailbox-type = "akka.dispatch.UnboundedControlAwareMailbox"
      }

      bounded-control-aware-queue-based {
        # FQCN of the MailboxType, The Class of the FQCN must have a public
        # constructor with (akka.actor.ActorSystem.Settings,
        # com.typesafe.config.Config) parameters.
        mailbox-type = "akka.dispatch.BoundedControlAwareMailbox"
      }

      # The LoggerMailbox will drain all messages in the mailbox
      # when the system is shutdown and deliver them to the StandardOutLogger.
      # Do not change this unless you know what you are doing.
      logger-queue {
        mailbox-type = "akka.event.LoggerMailboxType"
      }
    }

    debug {
      # enable function of Actor.loggable(), which is to log any received message
      # at DEBUG level, see the “Testing Actor Systems” section of the Akka
      # Documentation at http://akka.io/docs
      receive = off

      # enable DEBUG logging of all AutoReceiveMessages (Kill, PoisonPill etc.)
      autoreceive = off

      # enable DEBUG logging of actor lifecycle changes
      lifecycle = off

      # enable DEBUG logging of all LoggingFSMs for events, transitions and timers
      fsm = off

      # enable DEBUG logging of subscription changes on the eventStream
      event-stream = off

      # enable DEBUG logging of unhandled messages
      unhandled = off

      # enable WARN logging of misconfigured routers
      router-misconfiguration = off
    }

    # SECURITY BEST-PRACTICE is to disable java serialization for its multiple
    # known attack surfaces.
    #
    # This setting is a short-cut to
    # - using DisabledJavaSerializer instead of JavaSerializer
    #
    # Completely disable the use of `akka.serialization.JavaSerialization` by the
    # Akka Serialization extension, instead DisabledJavaSerializer will
    # be inserted which will fail explicitly if attempts to use java serialization are made.
    #
    # The log messages emitted by such serializer SHOULD be treated as potential
    # attacks which the serializer prevented, as they MAY indicate an external operator
    # attempting to send malicious messages intending to use java serialization as attack vector.
    # The attempts are logged with the SECURITY marker.
    #
    # Please note that this option does not stop you from manually invoking java serialization
    #
    allow-java-serialization = off

    # Log warnings when the Java serialization is used to serialize messages.
    # Java serialization is not very performant and should not be used in production
    # environments unless you don't care about performance and security. In that case
    # you can turn this off.
    warn-about-java-serializer-usage = on

    # To be used with the above warn-about-java-serializer-usage
    # When warn-about-java-serializer-usage = on, and this warn-on-no-serialization-verification = off,
    # warnings are suppressed for classes extending NoSerializationVerificationNeeded
    # to reduce noise.
    warn-on-no-serialization-verification = on

    # Entries for pluggable serializers and their bindings.
    serializers {
      java = "akka.serialization.JavaSerializer"
      bytes = "akka.serialization.ByteArraySerializer"
      primitive-long = "akka.serialization.LongSerializer"
      primitive-int = "akka.serialization.IntSerializer"
      primitive-string = "akka.serialization.StringSerializer"
      primitive-bytestring = "akka.serialization.ByteStringSerializer"
      primitive-boolean = "akka.serialization.BooleanSerializer"
    }

    # Class to Serializer binding. You only need to specify the name of an
    # interface or abstract base class of the messages. In case of ambiguity it
    # is using the most specific configured class, or giving a warning and
    # choosing the “first” one.
    #
    # To disable one of the default serializers, assign its class to "none", like
    # "java.io.Serializable" = none
    serialization-bindings {
      "[B" = bytes
      "java.io.Serializable" = java

      "java.lang.String" = primitive-string
      "akka.util.ByteString$ByteString1C" = primitive-bytestring
      "akka.util.ByteString$ByteString1" = primitive-bytestring
      "akka.util.ByteString$ByteStrings" = primitive-bytestring
      "java.lang.Long" = primitive-long
      "scala.Long" = primitive-long
      "java.lang.Integer" = primitive-int
      "scala.Int" = primitive-int
      "java.lang.Boolean" = primitive-boolean
      "scala.Boolean" = primitive-boolean
    }

    # Configuration namespace of serialization identifiers.
    # Each serializer implementation must have an entry in the following format:
    # `akka.actor.serialization-identifiers."FQCN" = ID`
    # where `FQCN` is fully qualified class name of the serializer implementation
    # and `ID` is globally unique serializer identifier number.
    # Identifier values from 0 to 40 are reserved for Akka internal usage.
    serialization-identifiers {
      "akka.serialization.JavaSerializer" = 1
      "akka.serialization.ByteArraySerializer" = 4

      primitive-long = 18
      primitive-int = 19
      primitive-string = 20
      primitive-bytestring = 21
      primitive-boolean = 35
    }

  }

  serialization.protobuf {

    # Additional classes that are allowed even if they are not defined in `serialization-bindings`.
    # It can be exact class name or name of super class or interfaces (one level).
    # This is useful when a class is not used for serialization any more and therefore removed
    # from `serialization-bindings`, but should still be possible to deserialize.
    whitelist-class = [
      "com.google.protobuf.GeneratedMessage",
      "com.google.protobuf.GeneratedMessageV3",
      "scalapb.GeneratedMessageCompanion",
      "akka.protobuf.GeneratedMessage",
      "akka.protobufv3.internal.GeneratedMessageV3"
    ]
  }

  # Used to set the behavior of the scheduler.
  # Changing the default values may change the system behavior drastically so make
  # sure you know what you're doing! See the Scheduler section of the Akka
  # Documentation for more details.
  scheduler {
    # The LightArrayRevolverScheduler is used as the default scheduler in the
    # system. It does not execute the scheduled tasks on exact time, but on every
    # tick, it will run everything that is (over)due. You can increase or decrease
    # the accuracy of the execution timing by specifying smaller or larger tick
    # duration. If you are scheduling a lot of tasks you should consider increasing
    # the ticks per wheel.
    # Note that it might take up to 1 tick to stop the Timer, so setting the
    # tick-duration to a high value will make shutting down the actor system
    # take longer.
    tick-duration = 10ms

    # The timer uses a circular wheel of buckets to store the timer tasks.
    # This should be set such that the majority of scheduled timeouts (for high
    # scheduling frequency) will be shorter than one rotation of the wheel
    # (ticks-per-wheel * ticks-duration)
    # THIS MUST BE A POWER OF TWO!
    ticks-per-wheel = 512

    # This setting selects the timer implementation which shall be loaded at
    # system start-up.
    # The class given here must implement the akka.actor.Scheduler interface
    # and offer a public constructor which takes three arguments:
    #  1) com.typesafe.config.Config
    #  2) akka.event.LoggingAdapter
    #  3) java.util.concurrent.ThreadFactory
    implementation = akka.actor.LightArrayRevolverScheduler

    # When shutting down the scheduler, there will typically be a thread which
    # needs to be stopped, and this timeout determines how long to wait for
    # that to happen. In case of timeout the shutdown of the actor system will
    # proceed without running possibly still enqueued tasks.
    shutdown-timeout = 5s
  }

  io {

    # By default the select loops run on dedicated threads, hence using a
    # PinnedDispatcher
    pinned-dispatcher {
      type = "PinnedDispatcher"
      executor = "thread-pool-executor"
      thread-pool-executor.allow-core-timeout = off
    }

    tcp {

      # The number of selectors to stripe the served channels over; each of
      # these will use one select loop on the selector-dispatcher.
      nr-of-selectors = 1

      # Maximum number of open channels supported by this TCP module; there is
      # no intrinsic general limit, this setting is meant to enable DoS
      # protection by limiting the number of concurrently connected clients.
      # Also note that this is a "soft" limit; in certain cases the implementation
      # will accept a few connections more or a few less than the number configured
      # here. Must be an integer > 0 or "unlimited".
      max-channels = 256000

      # When trying to assign a new connection to a selector and the chosen
      # selector is at full capacity, retry selector choosing and assignment
      # this many times before giving up
      selector-association-retries = 10

      # The maximum number of connection that are accepted in one go,
      # higher numbers decrease latency, lower numbers increase fairness on
      # the worker-dispatcher
      batch-accept-limit = 10

      # The number of bytes per direct buffer in the pool used to read or write
      # network data from the kernel.
      direct-buffer-size = 128 KiB

      # The maximal number of direct buffers kept in the direct buffer pool for
      # reuse.
      direct-buffer-pool-limit = 1000

      # The duration a connection actor waits for a `Register` message from
      # its commander before aborting the connection.
      register-timeout = 5s

      # The maximum number of bytes delivered by a `Received` message. Before
      # more data is read from the network the connection actor will try to
      # do other work.
      # The purpose of this setting is to impose a smaller limit than the
      # configured receive buffer size. When using value 'unlimited' it will
      # try to read all from the receive buffer.
      max-received-message-size = unlimited

      # Enable fine grained logging of what goes on inside the implementation.
      # Be aware that this may log more than once per message sent to the actors
      # of the tcp implementation.
      trace-logging = off

      # Fully qualified config path which holds the dispatcher configuration
      # to be used for running the select() calls in the selectors
      selector-dispatcher = "akka.io.pinned-dispatcher"

      # Fully qualified config path which holds the dispatcher configuration
      # for the read/write worker actors
      worker-dispatcher = "akka.actor.internal-dispatcher"

      # Fully qualified config path which holds the dispatcher configuration
      # for the selector management actors
      management-dispatcher = "akka.actor.internal-dispatcher"

      # Fully qualified config path which holds the dispatcher configuration
      # on which file IO tasks are scheduled
      file-io-dispatcher = "akka.actor.default-blocking-io-dispatcher"

      # The maximum number of bytes (or "unlimited") to transfer in one batch
      # when using `WriteFile` command which uses `FileChannel.transferTo` to
      # pipe files to a TCP socket. On some OS like Linux `FileChannel.transferTo`
      # may block for a long time when network IO is faster than file IO.
      # Decreasing the value may improve fairness while increasing may improve
      # throughput.
      file-io-transferTo-limit = 512 KiB

      # The number of times to retry the `finishConnect` call after being notified about
      # OP_CONNECT. Retries are needed if the OP_CONNECT notification doesn't imply that
      # `finishConnect` will succeed, which is the case on Android.
      finish-connect-retries = 5

      # On Windows connection aborts are not reliably detected unless an OP_READ is
      # registered on the selector _after_ the connection has been reset. This
      # workaround enables an OP_CONNECT which forces the abort to be visible on Windows.
      # Enabling this setting on other platforms than Windows will cause various failures
      # and undefined behavior.
      # Possible values of this key are on, off and auto where auto will enable the
      # workaround if Windows is detected automatically.
      windows-connection-abort-workaround-enabled = off
    }

    udp {

      # The number of selectors to stripe the served channels over; each of
      # these will use one select loop on the selector-dispatcher.
      nr-of-selectors = 1

      # Maximum number of open channels supported by this UDP module Generally
      # UDP does not require a large number of channels, therefore it is
      # recommended to keep this setting low.
      max-channels = 4096

      # The select loop can be used in two modes:
      # - setting "infinite" will select without a timeout, hogging a thread
      # - setting a positive timeout will do a bounded select call,
      #   enabling sharing of a single thread between multiple selectors
      #   (in this case you will have to use a different configuration for the
      #   selector-dispatcher, e.g. using "type=Dispatcher" with size 1)
      # - setting it to zero means polling, i.e. calling selectNow()
      select-timeout = infinite

      # When trying to assign a new connection to a selector and the chosen
      # selector is at full capacity, retry selector choosing and assignment
      # this many times before giving up
      selector-association-retries = 10

      # The maximum number of datagrams that are read in one go,
      # higher numbers decrease latency, lower numbers increase fairness on
      # the worker-dispatcher
      receive-throughput = 3

      # The number of bytes per direct buffer in the pool used to read or write
      # network data from the kernel.
      direct-buffer-size = 128 KiB

      # The maximal number of direct buffers kept in the direct buffer pool for
      # reuse.
      direct-buffer-pool-limit = 1000

      # Enable fine grained logging of what goes on inside the implementation.
      # Be aware that this may log more than once per message sent to the actors
      # of the tcp implementation.
      trace-logging = off

      # Fully qualified config path which holds the dispatcher configuration
      # to be used for running the select() calls in the selectors
      selector-dispatcher = "akka.io.pinned-dispatcher"

      # Fully qualified config path which holds the dispatcher configuration
      # for the read/write worker actors
      worker-dispatcher = "akka.actor.internal-dispatcher"

      # Fully qualified config path which holds the dispatcher configuration
      # for the selector management actors
      management-dispatcher = "akka.actor.internal-dispatcher"
    }

    udp-connected {

      # The number of selectors to stripe the served channels over; each of
      # these will use one select loop on the selector-dispatcher.
      nr-of-selectors = 1

      # Maximum number of open channels supported by this UDP module Generally
      # UDP does not require a large number of channels, therefore it is
      # recommended to keep this setting low.
      max-channels = 4096

      # The select loop can be used in two modes:
      # - setting "infinite" will select without a timeout, hogging a thread
      # - setting a positive timeout will do a bounded select call,
      #   enabling sharing of a single thread between multiple selectors
      #   (in this case you will have to use a different configuration for the
      #   selector-dispatcher, e.g. using "type=Dispatcher" with size 1)
      # - setting it to zero means polling, i.e. calling selectNow()
      select-timeout = infinite

      # When trying to assign a new connection to a selector and the chosen
      # selector is at full capacity, retry selector choosing and assignment
      # this many times before giving up
      selector-association-retries = 10

      # The maximum number of datagrams that are read in one go,
      # higher numbers decrease latency, lower numbers increase fairness on
      # the worker-dispatcher
      receive-throughput = 3

      # The number of bytes per direct buffer in the pool used to read or write
      # network data from the kernel.
      direct-buffer-size = 128 KiB

      # The maximal number of direct buffers kept in the direct buffer pool for
      # reuse.
      direct-buffer-pool-limit = 1000

      # Enable fine grained logging of what goes on inside the implementation.
      # Be aware that this may log more than once per message sent to the actors
      # of the tcp implementation.
      trace-logging = off

      # Fully qualified config path which holds the dispatcher configuration
      # to be used for running the select() calls in the selectors
      selector-dispatcher = "akka.io.pinned-dispatcher"

      # Fully qualified config path which holds the dispatcher configuration
      # for the read/write worker actors
      worker-dispatcher = "akka.actor.internal-dispatcher"

      # Fully qualified config path which holds the dispatcher configuration
      # for the selector management actors
      management-dispatcher = "akka.actor.internal-dispatcher"
    }

    dns {
      # Fully qualified config path which holds the dispatcher configuration
      # for the manager and resolver router actors.
      # For actual router configuration see akka.actor.deployment./IO-DNS/*
      dispatcher = "akka.actor.internal-dispatcher"

      # Name of the subconfig at path akka.io.dns, see inet-address below
      #
      # Change to `async-dns` to use the new "native" DNS resolver,
      # which is also capable of resolving SRV records.
      resolver = "inet-address"

      # To-be-deprecated DNS resolver implementation which uses the Java InetAddress to resolve DNS records.
      # To be replaced by `akka.io.dns.async` which implements the DNS protocol natively and without blocking (which InetAddress does)
      inet-address {
        # Must implement akka.io.DnsProvider
        provider-object = "akka.io.InetAddressDnsProvider"

        # To set the time to cache name resolutions
        # Possible values:
        # default: sun.net.InetAddressCachePolicy.get() and getNegative()
        # forever: cache forever
        # never: no caching
        # n [time unit]: positive timeout with unit, for example 30s
        positive-ttl = default
        negative-ttl = default

        # How often to sweep out expired cache entries.
        # Note that this interval has nothing to do with TTLs
        cache-cleanup-interval = 120s
      }

      async-dns {
        provider-object = "akka.io.dns.internal.AsyncDnsProvider"

        # Set upper bound for caching successfully resolved dns entries
        # if the DNS record has a smaller TTL value than the setting that
        # will be used. Default is to use the record TTL with no cap.
        # Possible values:
        # forever: always use the minimum TTL from the found records
        # never: never cache
        # n [time unit] = cap the caching to this value
        positive-ttl = forever

        # Set how long the fact that a DNS record could not be found is
        # cached. If a new resolution is done while the fact is cached it will
        # be failed and not result in an actual DNS resolution. Default is
        # to never cache.
        # Possible values:
        # never: never cache
        # forever: cache a missing DNS record forever (you probably will not want to do this)
        # n [time unit] = cache for this long
        negative-ttl = never

        # Configures nameservers to query during DNS resolution.
        # Defaults to the nameservers that would be used by the JVM by default.
        # Set to a list of IPs to override the servers, e.g. [ "8.8.8.8", "8.8.4.4" ] for Google's servers
        # If multiple are defined then they are tried in order until one responds
        nameservers = default

        # The time that a request is allowed to live before being discarded
        # given no reply. The lower bound of this should always be the amount
        # of time to reasonably expect a DNS server to reply within.
        # If multiple name servers are provided then each gets this long to response before trying
        # the next one
        resolve-timeout = 5s

        # How often to sweep out expired cache entries.
        # Note that this interval has nothing to do with TTLs
        cache-cleanup-interval = 120s

        # Configures the list of search domains.
        # Defaults to a system dependent lookup (on Unix like OSes, will attempt to parse /etc/resolv.conf, on
        # other platforms, will not make any attempt to lookup the search domains). Set to a single domain, or
        # a list of domains, eg, [ "example.com", "example.net" ].
        search-domains = default

        # Any hosts that have a number of dots less than this will not be looked up directly, instead, a search on
        # the search domains will be tried first. This corresponds to the ndots option in /etc/resolv.conf, see
        # https://linux.die.net/man/5/resolver for more info.
        # Defaults to a system dependent lookup (on Unix like OSes, will attempt to parse /etc/resolv.conf, on
        # other platforms, will default to 1).
        ndots = default
      }
    }
  }


  # CoordinatedShutdown is an extension that will perform registered
  # tasks in the order that is defined by the phases. It is started
  # by calling CoordinatedShutdown(system).run(). This can be triggered
  # by different things, for example:
  # - JVM shutdown hook will by default run CoordinatedShutdown
  # - Cluster node will automatically run CoordinatedShutdown when it
  #   sees itself as Exiting
  # - A management console or other application specific command can
  #   run CoordinatedShutdown
  coordinated-shutdown {
    # The timeout that will be used for a phase if not specified with
    # 'timeout' in the phase
    default-phase-timeout = 5 s

    # Terminate the ActorSystem in the last phase actor-system-terminate.
    terminate-actor-system = on

    # Exit the JVM (System.exit(0)) in the last phase actor-system-terminate
    # if this is set to 'on'. It is done after termination of the
    # ActorSystem if terminate-actor-system=on, otherwise it is done
    # immediately when the last phase is reached.
    exit-jvm = off

    # Exit status to use on System.exit(int) when 'exit-jvm' is 'on'.
    exit-code = 0

    # Run the coordinated shutdown when the JVM process exits, e.g.
    # via kill SIGTERM signal (SIGINT ctrl-c doesn't work).
    # This property is related to `akka.jvm-shutdown-hooks` above.
    run-by-jvm-shutdown-hook = on

    # Run the coordinated shutdown when ActorSystem.terminate is called.
    # Enabling this and disabling terminate-actor-system is not a supported
    # combination (will throw ConfigurationException at startup).
    run-by-actor-system-terminate = on

    # When Coordinated Shutdown is triggered an instance of `Reason` is
    # required. That value can be used to override the default settings.
    # Only 'exit-jvm', 'exit-code' and 'terminate-actor-system' may be
    # overridden depending on the reason.
    reason-overrides {
      # Overrides are applied using the `reason.getClass.getName`.
      # Overrides the `exit-code` when the `Reason` is a cluster
      # Downing or a Cluster Join Unsuccessful event
      "akka.actor.CoordinatedShutdown$ClusterDowningReason$" {
        exit-code = -1
      }
      "akka.actor.CoordinatedShutdown$ClusterJoinUnsuccessfulReason$" {
        exit-code = -1
      }
    }

    #//#coordinated-shutdown-phases
    # CoordinatedShutdown is enabled by default and will run the tasks that
    # are added to these phases by individual Akka modules and user logic.
    #
    # The phases are ordered as a DAG by defining the dependencies between the phases
    # to make sure shutdown tasks are run in the right order.
    #
    # In general user tasks belong in the first few phases, but there may be use
    # cases where you would want to hook in new phases or register tasks later in
    # the DAG.
    #
    # Each phase is defined as a named config section with the
    # following optional properties:
    # - timeout=15s: Override the default-phase-timeout for this phase.
    # - recover=off: If the phase fails the shutdown is aborted
    #                and depending phases will not be executed.
    # - enabled=off: Skip all tasks registered in this phase. DO NOT use
    #                this to disable phases unless you are absolutely sure what the
    #                consequences are. Many of the built in tasks depend on other tasks
    #                having been executed in earlier phases and may break if those are disabled.
    # depends-on=[]: Run the phase after the given phases
    phases {

      # The first pre-defined phase that applications can add tasks to.
      # Note that more phases can be added in the application's
      # configuration by overriding this phase with an additional
      # depends-on.
      before-service-unbind {
      }

      # Stop accepting new incoming connections.
      # This is where you can register tasks that makes a server stop accepting new connections. Already
      # established connections should be allowed to continue and complete if possible.
      service-unbind {
        depends-on = [before-service-unbind]
      }

      # Wait for requests that are in progress to be completed.
      # This is where you register tasks that will wait for already established connections to complete, potentially
      # also first telling them that it is time to close down.
      service-requests-done {
        depends-on = [service-unbind]
      }

      # Final shutdown of service endpoints.
      # This is where you would add tasks that forcefully kill connections that are still around.
      service-stop {
        depends-on = [service-requests-done]
      }

      # Phase for custom application tasks that are to be run
      # after service shutdown and before cluster shutdown.
      before-cluster-shutdown {
        depends-on = [service-stop]
      }

      # Graceful shutdown of the Cluster Sharding regions.
      # This phase is not meant for users to add tasks to.
      cluster-sharding-shutdown-region {
        timeout = 10 s
        depends-on = [before-cluster-shutdown]
      }

      # Emit the leave command for the node that is shutting down.
      # This phase is not meant for users to add tasks to.
      cluster-leave {
        depends-on = [cluster-sharding-shutdown-region]
      }

      # Shutdown cluster singletons
      # This is done as late as possible to allow the shard region shutdown triggered in
      # the "cluster-sharding-shutdown-region" phase to complete before the shard coordinator is shut down.
      # This phase is not meant for users to add tasks to.
      cluster-exiting {
        timeout = 10 s
        depends-on = [cluster-leave]
      }

      # Wait until exiting has been completed
      # This phase is not meant for users to add tasks to.
      cluster-exiting-done {
        depends-on = [cluster-exiting]
      }

      # Shutdown the cluster extension
      # This phase is not meant for users to add tasks to.
      cluster-shutdown {
        depends-on = [cluster-exiting-done]
      }

      # Phase for custom application tasks that are to be run
      # after cluster shutdown and before ActorSystem termination.
      before-actor-system-terminate {
        depends-on = [cluster-shutdown]
      }

      # Last phase. See terminate-actor-system and exit-jvm above.
      # Don't add phases that depends on this phase because the
      # dispatcher and scheduler of the ActorSystem have been shutdown.
      # This phase is not meant for users to add tasks to.
      actor-system-terminate {
        timeout = 10 s
        depends-on = [before-actor-system-terminate]
      }
    }
    #//#coordinated-shutdown-phases
  }

}

akka-actor-typed

akka.actor.typed {

  # List FQCN of `akka.actor.typed.ExtensionId`s which shall be loaded at actor system startup.
  # Should be on the format: 'extensions = ["com.example.MyExtId1", "com.example.MyExtId2"]' etc.
  # See the Akka Documentation for more info about Extensions
  extensions = []

  # List FQCN of extensions which shall be loaded at actor system startup.
  # Library extensions are regular extensions that are loaded at startup and are
  # available for third party library authors to enable auto-loading of extensions when
  # present on the classpath. This is done by appending entries:
  # 'library-extensions += "Extension"' in the library `reference.conf`.
  #
  # Should not be set by end user applications in 'application.conf', use the extensions property for that
  #
  library-extensions = ${?akka.actor.typed.library-extensions} []

  # Receptionist is started eagerly to allow clustered receptionist to gather remote registrations early on.
  library-extensions += "akka.actor.typed.receptionist.Receptionist"

  # While an actor is restarted (waiting for backoff to expire and children to stop)
  # incoming messages and signals are stashed, and delivered later to the newly restarted
  # behavior. This property defines the capacity in number of messages of the stash
  # buffer. If the capacity is exceed then additional incoming messages are dropped.
  restart-stash-capacity = 1000

  # Typed mailbox defaults to the single consumber mailbox as balancing dispatcher is not supported
  default-mailbox {
    mailbox-type = "akka.dispatch.SingleConsumerOnlyUnboundedMailbox"
  }
}

# Load typed extensions by a classic extension.
akka.library-extensions += "akka.actor.typed.internal.adapter.ActorSystemAdapter$LoadTypedExtensions"

akka.actor {
  serializers {
    typed-misc = "akka.actor.typed.internal.MiscMessageSerializer"
    service-key = "akka.actor.typed.internal.receptionist.ServiceKeySerializer"
  }

  serialization-identifiers {
    "akka.actor.typed.internal.MiscMessageSerializer" = 24
    "akka.actor.typed.internal.receptionist.ServiceKeySerializer" = 26
  }

  serialization-bindings {
    "akka.actor.typed.ActorRef" = typed-misc
    "akka.actor.typed.internal.adapter.ActorRefAdapter" = typed-misc
    "akka.actor.typed.internal.receptionist.DefaultServiceKey" = service-key
  }
}

# When using Akka Typed (having akka-actor-typed in classpath) the
# akka.event.slf4j.Slf4jLogger is enabled instead of the DefaultLogger
# even though it has not been explicitly defined in `akka.loggers`
# configuration.
#
# Slf4jLogger will be used for all Akka classic logging via eventStream,
# including logging from Akka internals. The Slf4jLogger is then using
# an ordinary org.slf4j.Logger to emit the log events.
#
# The Slf4jLoggingFilter is also enabled automatically.
#
# This behavior can be disabled by setting this property to `off`.
akka.use-slf4j = on

akka-cluster-typed

############################################
# Akka Cluster Typed Reference Config File #
############################################

# This is the reference config file that contains all the default settings.
# Make your edits/overrides in your application.conf.

akka.cluster.typed.receptionist {
  # Updates with Distributed Data are done with this consistency level.
  # Possible values: local, majority, all, 2, 3, 4 (n)
  write-consistency = local

  # Period task to remove actor references that are hosted by removed nodes,
  # in case of abrupt termination.
  pruning-interval = 3 s

  # Shard the services over this many Distributed Data keys, with large amounts of different
  # service keys storing all of them in the same Distributed Data entry would lead to large updates
  # etc. instead the keys are sharded across this number of keys. This must be the same on all nodes
  # in a cluster, changing it requires a full cluster restart (stopping all nodes before starting them again)
  distributed-key-count = 5

  # Settings for the Distributed Data replicator used by Receptionist.
  # Same layout as akka.cluster.distributed-data.
  distributed-data = ${akka.cluster.distributed-data}
  # make sure that by default it's for all roles (Play loads config in different way)
  distributed-data.role = ""
}

akka.cluster.ddata.typed {
  # The timeout to use for ask operations in ReplicatorMessageAdapter.
  # This should be longer than the timeout given in Replicator.WriteConsistency and
  # Replicator.ReadConsistency. The replicator will always send a reply within those
  # timeouts so the unexpected ask timeout should not occur, but for cleanup in a
  # failure situation it must still exist.
  # If askUpdate, askGet or askDelete takes longer then this timeout a
  # java.util.concurrent.TimeoutException will be thrown by the requesting actor and
  # may be handled by supervision.
  replicator-message-adapter-unexpected-ask-timeout = 20 s
}

akka {
  actor {
    serialization-identifiers {
      "akka.cluster.typed.internal.AkkaClusterTypedSerializer" = 28
    }
    serializers {
      typed-cluster = "akka.cluster.typed.internal.AkkaClusterTypedSerializer"
    }
    serialization-bindings {
      "akka.cluster.typed.internal.receptionist.ClusterReceptionist$Entry" = typed-cluster
    }
  }
  cluster.configuration-compatibility-check.checkers {
    receptionist = "akka.cluster.typed.internal.receptionist.ClusterReceptionistConfigCompatChecker"
  }
}

akka-cluster

######################################
# Akka Cluster Reference Config File #
######################################

# This is the reference config file that contains all the default settings.
# Make your edits/overrides in your application.conf.

akka {

  cluster {
    # Initial contact points of the cluster.
    # The nodes to join automatically at startup.
    # Comma separated full URIs defined by a string on the form of
    # "akka://[email protected]:port"
    # Leave as empty if the node is supposed to be joined manually.
    seed-nodes = []

    # How long to wait for one of the seed nodes to reply to initial join request.
    # When this is the first seed node and there is no positive reply from the other
    # seed nodes within this timeout it will join itself to bootstrap the cluster.
    # When this is not the first seed node the join attempts will be performed with
    # this interval.  
    seed-node-timeout = 5s

    # If a join request fails it will be retried after this period.
    # Disable join retry by specifying "off".
    retry-unsuccessful-join-after = 10s
    
    # The joining of given seed nodes will by default be retried indefinitely until
    # a successful join. That process can be aborted if unsuccessful by defining this
    # timeout. When aborted it will run CoordinatedShutdown, which by default will
    # terminate the ActorSystem. CoordinatedShutdown can also be configured to exit
    # the JVM. It is useful to define this timeout if the seed-nodes are assembled
    # dynamically and a restart with new seed-nodes should be tried after unsuccessful
    # attempts.   
    shutdown-after-unsuccessful-join-seed-nodes = off

    # Time margin after which shards or singletons that belonged to a downed/removed
    # partition are created in surviving partition. The purpose of this margin is that
    # in case of a network partition the persistent actors in the non-surviving partitions
    # must be stopped before corresponding persistent actors are started somewhere else.
    # This is useful if you implement downing strategies that handle network partitions,
    # e.g. by keeping the larger side of the partition and shutting down the smaller side.
    # Disable with "off" or specify a duration to enable.
    down-removal-margin = off

    # Pluggable support for downing of nodes in the cluster.
    # If this setting is left empty the `NoDowning` provider is used and no automatic downing will be performed.
    #
    # If specified the value must be the fully qualified class name of a subclass of
    # `akka.cluster.DowningProvider` having a public one argument constructor accepting an `ActorSystem`
    downing-provider-class = ""

    # Artery only setting
    # When a node has been gracefully removed, let this time pass (to allow for example
    # cluster singleton handover to complete) and then quarantine the removed node.
    quarantine-removed-node-after = 5s

    # If this is set to "off", the leader will not move 'Joining' members to 'Up' during a network
    # split. This feature allows the leader to accept 'Joining' members to be 'WeaklyUp'
    # so they become part of the cluster even during a network split. The leader will
    # move `Joining` members to 'WeaklyUp' after 3 rounds of 'leader-actions-interval'
    # without convergence.
    # The leader will move 'WeaklyUp' members to 'Up' status once convergence has been reached.
    allow-weakly-up-members = on

    # The roles of this member. List of strings, e.g. roles = ["A", "B"].
    # The roles are part of the membership information and can be used by
    # routers or other services to distribute work to certain member types,
    # e.g. front-end and back-end nodes.
    # Roles are not allowed to start with "dc-" as that is reserved for the
    # special role assigned from the data-center a node belongs to (see the
    # multi-data-center section below)
    roles = []
    
    # Run the coordinated shutdown from phase 'cluster-shutdown' when the cluster
    # is shutdown for other reasons than when leaving, e.g. when downing. This
    # will terminate the ActorSystem when the cluster extension is shutdown.
    run-coordinated-shutdown-when-down = on

    role {
      # Minimum required number of members of a certain role before the leader
      # changes member status of 'Joining' members to 'Up'. Typically used together
      # with 'Cluster.registerOnMemberUp' to defer some action, such as starting
      # actors, until the cluster has reached a certain size.
      # E.g. to require 2 nodes with role 'frontend' and 3 nodes with role 'backend':
      #   frontend.min-nr-of-members = 2
      #   backend.min-nr-of-members = 3
      #<role-name>.min-nr-of-members = 1
    }

    # Minimum required number of members before the leader changes member status
    # of 'Joining' members to 'Up'. Typically used together with
    # 'Cluster.registerOnMemberUp' to defer some action, such as starting actors,
    # until the cluster has reached a certain size.
    min-nr-of-members = 1

    # Enable/disable info level logging of cluster events.
    # These are logged with logger name `akka.cluster.Cluster`.
    log-info = on

    # Enable/disable verbose info-level logging of cluster events
    # for temporary troubleshooting. Defaults to 'off'.
    # These are logged with logger name `akka.cluster.Cluster`.
    log-info-verbose = off

    # Enable or disable JMX MBeans for management of the cluster
    jmx.enabled = on

    # Enable or disable multiple JMX MBeans in the same JVM
    # If this is disabled, the MBean Object name is "akka:type=Cluster"
    # If this is enabled, them MBean Object names become "akka:type=Cluster,port=$clusterPortNumber"
    jmx.multi-mbeans-in-same-jvm = off

    # how long should the node wait before starting the periodic tasks
    # maintenance tasks?
    periodic-tasks-initial-delay = 1s

    # how often should the node send out gossip information?
    gossip-interval = 1s
    
    # discard incoming gossip messages if not handled within this duration
    gossip-time-to-live = 2s

    # how often should the leader perform maintenance tasks?
    leader-actions-interval = 1s

    # how often should the node move nodes, marked as unreachable by the failure
    # detector, out of the membership ring?
    unreachable-nodes-reaper-interval = 1s

    # How often the current internal stats should be published.
    # A value of 0s can be used to always publish the stats, when it happens.
    # Disable with "off".
    publish-stats-interval = off

    # The id of the dispatcher to use for cluster actors.
    # If specified you need to define the settings of the actual dispatcher.
    use-dispatcher = "akka.actor.internal-dispatcher"

    # Gossip to random node with newer or older state information, if any with
    # this probability. Otherwise Gossip to any random live node.
    # Probability value is between 0.0 and 1.0. 0.0 means never, 1.0 means always.
    gossip-different-view-probability = 0.8
    
    # Reduced the above probability when the number of nodes in the cluster
    # greater than this value.
    reduce-gossip-different-view-probability = 400

    # When a node is removed the removal is marked with a tombstone
    # which is kept at least this long, after which it is pruned, if there is a partition
    # longer than this it could lead to removed nodes being re-added to the cluster
    prune-gossip-tombstones-after = 24h

    # Settings for the Phi accrual failure detector (http://www.jaist.ac.jp/~defago/files/pdf/IS_RR_2004_010.pdf
    # [Hayashibara et al]) used by the cluster subsystem to detect unreachable
    # members.
    # The default PhiAccrualFailureDetector will trigger if there are no heartbeats within
    # the duration heartbeat-interval + acceptable-heartbeat-pause + threshold_adjustment,
    # i.e. around 5.5 seconds with default settings.
    failure-detector {

      # FQCN of the failure detector implementation.
      # It must implement akka.remote.FailureDetector and have
      # a public constructor with a com.typesafe.config.Config and
      # akka.actor.EventStream parameter.
      implementation-class = "akka.remote.PhiAccrualFailureDetector"

      # How often keep-alive heartbeat messages should be sent to each connection.
      heartbeat-interval = 1 s

      # Defines the failure detector threshold.
      # A low threshold is prone to generate many wrong suspicions but ensures
      # a quick detection in the event of a real crash. Conversely, a high
      # threshold generates fewer mistakes but needs more time to detect
      # actual crashes.
      threshold = 8.0

      # Number of the samples of inter-heartbeat arrival times to adaptively
      # calculate the failure timeout for connections.
      max-sample-size = 1000

      # Minimum standard deviation to use for the normal distribution in
      # AccrualFailureDetector. Too low standard deviation might result in
      # too much sensitivity for sudden, but normal, deviations in heartbeat
      # inter arrival times.
      min-std-deviation = 100 ms

      # Number of potentially lost/delayed heartbeats that will be
      # accepted before considering it to be an anomaly.
      # This margin is important to be able to survive sudden, occasional,
      # pauses in heartbeat arrivals, due to for example garbage collect or
      # network drop.
      acceptable-heartbeat-pause = 3 s

      # Number of member nodes that each member will send heartbeat messages to,
      # i.e. each node will be monitored by this number of other nodes.
      monitored-by-nr-of-members = 9
      
      # After the heartbeat request has been sent the first failure detection
      # will start after this period, even though no heartbeat message has
      # been received.
      expected-response-after = 1 s

    }

    # Configures multi-dc specific heartbeating and other mechanisms,
    # many of them have a direct counter-part in "one datacenter mode",
    # in which case these settings would not be used at all - they only apply,
    # if your cluster nodes are configured with at-least 2 different `akka.cluster.data-center` values.
    multi-data-center {

      # Defines which data center this node belongs to. It is typically used to make islands of the
      # cluster that are colocated. This can be used to make the cluster aware that it is running
      # across multiple availability zones or regions. It can also be used for other logical
      # grouping of nodes.
      self-data-center = "default"


      # Try to limit the number of connections between data centers. Used for gossip and heartbeating.
      # This will not limit connections created for the messaging of the application.
      # If the cluster does not span multiple data centers, this value has no effect.
      cross-data-center-connections = 5

      # The n oldest nodes in a data center will choose to gossip to another data center with
      # this probability. Must be a value between 0.0 and 1.0 where 0.0 means never, 1.0 means always.
      # When a data center is first started (nodes < 5) a higher probability is used so other data
      # centers find out about the new nodes more quickly
      cross-data-center-gossip-probability = 0.2

      failure-detector {
        # FQCN of the failure detector implementation.
        # It must implement akka.remote.FailureDetector and have
        # a public constructor with a com.typesafe.config.Config and
        # akka.actor.EventStream parameter.
        implementation-class = "akka.remote.DeadlineFailureDetector"
  
        # Number of potentially lost/delayed heartbeats that will be
        # accepted before considering it to be an anomaly.
        # This margin is important to be able to survive sudden, occasional,
        # pauses in heartbeat arrivals, due to for example garbage collect or
        # network drop.
        acceptable-heartbeat-pause = 10 s
        
        # How often keep-alive heartbeat messages should be sent to each connection.
        heartbeat-interval = 3 s
  
        # After the heartbeat request has been sent the first failure detection
        # will start after this period, even though no heartbeat message has
        # been received.
        expected-response-after = 1 s
      }
    }

    # If the tick-duration of the default scheduler is longer than the
    # tick-duration configured here a dedicated scheduler will be used for
    # periodic tasks of the cluster, otherwise the default scheduler is used.
    # See akka.scheduler settings for more details.
    scheduler {
      tick-duration = 33ms
      ticks-per-wheel = 512
    }

    debug {
      # Log heartbeat events (very verbose, useful mostly when debugging heartbeating issues).
      # These are logged with logger name `akka.cluster.ClusterHeartbeat`.
      verbose-heartbeat-logging = off

      # log verbose details about gossip
      verbose-gossip-logging = off
    }

    configuration-compatibility-check {

      # Enforce configuration compatibility checks when joining a cluster.
      # Set to off to allow joining nodes to join a cluster even when configuration incompatibilities are detected or
      # when the cluster does not support this feature. Compatibility checks are always performed and warning and
      # error messages are logged.
      #
      # This is particularly useful for rolling updates on clusters that do not support that feature. Since the old
      # cluster won't be able to send the compatibility confirmation to the joining node, the joining node won't be able
      # to 'know' if its allowed to join.
      enforce-on-join = on

      # Add named entry to this section with fully qualified class name of the JoinConfigCompatChecker
      # to enable.
      # Checkers defined in reference.conf can be disabled by application by using empty string value
      # for the named entry.
      checkers {
        akka-cluster = "akka.cluster.JoinConfigCompatCheckCluster"
      }

      # Some configuration properties might not be appropriate to transfer between nodes
      # and such properties can be excluded from the configuration compatibility check by adding
      # the paths of the properties to this list. Sensitive paths are grouped by key. Modules and third-party libraries
      # can define their own set of sensitive paths without clashing with each other (as long they use unique keys).
      #
      # All properties starting with the paths defined here are excluded, i.e. you can add the path of a whole
      # section here to skip everything inside that section.
      sensitive-config-paths {
        akka = [
          "user.home", "user.name", "user.dir",
          "socksNonProxyHosts", "http.nonProxyHosts", "ftp.nonProxyHosts",
          "akka.remote.secure-cookie",
          "akka.remote.classic.netty.ssl.security",
          # Pre 2.6 path, keep around to avoid sending things misconfigured with old paths
          "akka.remote.netty.ssl.security",
          "akka.remote.artery.ssl"
        ]
      }

    }
  }

  actor.deployment.default.cluster {
    # enable cluster aware router that deploys to nodes in the cluster
    enabled = off

    # Maximum number of routees that will be deployed on each cluster
    # member node.
    # Note that max-total-nr-of-instances defines total number of routees, but
    # number of routees per node will not be exceeded, i.e. if you
    # define max-total-nr-of-instances = 50 and max-nr-of-instances-per-node = 2
    # it will deploy 2 routees per new member in the cluster, up to
    # 25 members.
    max-nr-of-instances-per-node = 1
    
    # Maximum number of routees that will be deployed, in total
    # on all nodes. See also description of max-nr-of-instances-per-node.
    # For backwards compatibility reasons, nr-of-instances
    # has the same purpose as max-total-nr-of-instances for cluster
    # aware routers and nr-of-instances (if defined by user) takes
    # precedence over max-total-nr-of-instances. 
    max-total-nr-of-instances = 10000

    # Defines if routees are allowed to be located on the same node as
    # the head router actor, or only on remote nodes.
    # Useful for master-worker scenario where all routees are remote.
    allow-local-routees = on

    # Use members with all specified roles, or all members if undefined or empty.
    use-roles = []

    # Deprecated, since Akka 2.5.4, replaced by use-roles
    # Use members with specified role, or all members if undefined or empty.
    use-role = ""
  }

  # Protobuf serializer for cluster messages
  actor {
    serializers {
      akka-cluster = "akka.cluster.protobuf.ClusterMessageSerializer"
    }

    serialization-bindings {
      "akka.cluster.ClusterMessage" = akka-cluster
      "akka.cluster.routing.ClusterRouterPool" = akka-cluster
    }
    
    serialization-identifiers {
      "akka.cluster.protobuf.ClusterMessageSerializer" = 5
    }
    
  }

}

akka-discovery

######################################################
# Akka Discovery Config                              #
######################################################

akka.actor.deployment {
  "/SD-DNS/async-dns" {
    mailbox = "unbounded"
    router = "round-robin-pool"
    nr-of-instances = 1
  }
}

akka.discovery {

  # Users MUST configure this value to set the default discovery method.
  #
  # The value can be an implementation config path name, such as "akka-dns",
  # which would attempt to resolve as `akka.discovery.akka-dns` which is expected
  # to contain a `class` setting. As fallback, the root `akka-dns` setting scope
  # would be used. If none of those contained a `class` setting, then the value is
  # assumed to be a class name, and an attempt is made to instantiate it.
  method = "<method>"

  # Config based service discovery
  config {
    class = akka.discovery.config.ConfigServiceDiscovery

    # Location of the services in configuration
    services-path = "akka.discovery.config.services"

    # A map of services to resolve from configuration.
    # See docs for more examples.
    # A list of endpoints with host/port where port is optional e.g.
    # services {
    #  service1 {
    #    endpoints = [
    #      {
    #        host = "cat.com"
    #        port = 1233
    #      },
    #      {
    #        host = "dog.com"
    #      }
    #    ]
    #  },
    #  service2 {
    #    endpoints = [
    #    {
    #        host = "fish.com"
    #        port = 1233
    #      }
    #    ]
    #  }
    # }
    services = {

    }
  }

  # Aggregate multiple service discovery mechanisms
  aggregate {
    class = akka.discovery.aggregate.AggregateServiceDiscovery

    # List of service discovery methods to try in order. E.g config then fall back to DNS
    # ["config", "akka-dns"]
    discovery-methods = []

  }

  # DNS based service discovery
  akka-dns {
    class = akka.discovery.dns.DnsServiceDiscovery
  }
}

akka-coordination

akka.coordination {

  # Defaults for any lease implementation that doesn't include these properties
  lease {

    # FQCN of the implementation of the Lease
    lease-class = ""

    #defaults
    # if the node that acquired the leases crashes, how long should the lease be held before another owner can get it
    heartbeat-timeout = 120s

    # interval for communicating with the third party to confirm the lease is still held
    heartbeat-interval = 12s

    # lease implementations are expected to time out acquire and release calls or document
    # that they do not implement an operation timeout
    lease-operation-timeout = 5s

    #defaults
  }
}

akka-multi-node-testkit

#############################################
# Akka Remote Testing Reference Config File #
#############################################

# This is the reference config file that contains all the default settings.
# Make your edits/overrides in your application.conf.

akka {
  testconductor {

    # Timeout for joining a barrier: this is the maximum time any participants
    # waits for everybody else to join a named barrier.
    barrier-timeout = 30s
    
    # Timeout for interrogation of TestConductor’s Controller actor
    query-timeout = 10s
    
    # Threshold for packet size in time unit above which the failure injector will
    # split the packet and deliver in smaller portions; do not give value smaller
    # than HashedWheelTimer resolution (would not make sense)
    packet-split-threshold = 100ms
    
    # amount of time for the ClientFSM to wait for the connection to the conductor
    # to be successful
    connect-timeout = 20s
    
    # Number of connect attempts to be made to the conductor controller
    client-reconnects = 30
    
    # minimum time interval which is to be inserted between reconnect attempts
    reconnect-backoff = 1s

    netty {
      # (I&O) Used to configure the number of I/O worker threads on server sockets
      server-socket-worker-pool {
        # Min number of threads to cap factor-based number to
        pool-size-min = 1

        # The pool size factor is used to determine thread pool size
        # using the following formula: ceil(available processors * factor).
        # Resulting size is then bounded by the pool-size-min and
        # pool-size-max values.
        pool-size-factor = 1.0

        # Max number of threads to cap factor-based number to
        pool-size-max = 2
      }

      # (I&O) Used to configure the number of I/O worker threads on client sockets
      client-socket-worker-pool {
        # Min number of threads to cap factor-based number to
        pool-size-min = 1

        # The pool size factor is used to determine thread pool size
        # using the following formula: ceil(available processors * factor).
        # Resulting size is then bounded by the pool-size-min and
        # pool-size-max values.
        pool-size-factor = 1.0

        # Max number of threads to cap factor-based number to
        pool-size-max = 2
      }
    }
  }
}

akka-persistence-typed

akka.persistence.typed {

  # Persistent actors stash while recovering or persisting events,
  # this setting configures the default capacity of this stash.
  #
  # Stashing is always bounded to the size that is defined in this setting.
  # You can set it to large values, however "unbounded" buffering is not supported.
  # Negative or 0 values are not allowed.
  stash-capacity = 4096

  # Configure how to react when the event sourced stash overflows. This can happen in two scenarios:
  # when a event sourced actor is doing recovery, persisting or snapshotting and it gets more than
  # 'stash-capacity' commands, or if more than 'stash-capacity' commands are manually stashed with the
  # 'stash' effect.
  #
  # Possible options
  # - drop - the message is published as a akka.actor.typed.Dropped message on the event bus
  # - fail - an exception is thrown so that the actor is failed
  stash-overflow-strategy = "drop"

  # enables automatic DEBUG level logging of messages stashed automatically by an EventSourcedBehavior,
  # this may happen while it receives commands while it is recovering events or while it is persisting events
  log-stashing = off

}

akka-persistence

###########################################################
# Akka Persistence Extension Reference Configuration File #
###########################################################

# This is the reference config file that contains all the default settings.
# Make your edits in your application.conf in order to override these settings.

# Directory of persistence journal and snapshot store plugins is available at the 
# Akka Community Projects page http://akka.io/community/

# Default persistence extension settings.
akka.persistence {

    # When starting many persistent actors at the same time the journal
    # and its data store is protected from being overloaded by limiting number
    # of recoveries that can be in progress at the same time. When
    # exceeding the limit the actors will wait until other recoveries have
    # been completed.   
    max-concurrent-recoveries = 50

    # Fully qualified class name providing a default internal stash overflow strategy.
    # It needs to be a subclass of akka.persistence.StashOverflowStrategyConfigurator.
    # The default strategy throws StashOverflowException.
    internal-stash-overflow-strategy = "akka.persistence.ThrowExceptionConfigurator"
    journal {
        # Absolute path to the journal plugin configuration entry used by 
        # persistent actor by default.
        # Persistent actor can override `journalPluginId` method 
        # in order to rely on a different journal plugin.
        plugin = ""
        # List of journal plugins to start automatically. Use "" for the default journal plugin.
        auto-start-journals = []
    }
    snapshot-store {
        # Absolute path to the snapshot plugin configuration entry used by
        # persistent actor by default.
        # Persistent actor can override `snapshotPluginId` method
        # in order to rely on a different snapshot plugin.
        # It is not mandatory to specify a snapshot store plugin.
        # If you don't use snapshots you don't have to configure it.
        # Note that Cluster Sharding is using snapshots, so if you
        # use Cluster Sharding you need to define a snapshot store plugin. 
        plugin = ""
        # List of snapshot stores to start automatically. Use "" for the default snapshot store.
        auto-start-snapshot-stores = []
    }
    # used as default-snapshot store if no plugin configured 
    # (see `akka.persistence.snapshot-store`)
    no-snapshot-store {
      class = "akka.persistence.snapshot.NoSnapshotStore"
    }
    # Default reliable delivery settings.
    at-least-once-delivery {
        # Interval between re-delivery attempts.
        redeliver-interval = 5s
        # Maximum number of unconfirmed messages that will be sent in one 
        # re-delivery burst.
        redelivery-burst-limit = 10000
        # After this number of delivery attempts a 
        # `ReliableRedelivery.UnconfirmedWarning`, message will be sent to the actor.
        warn-after-number-of-unconfirmed-attempts = 5
        # Maximum number of unconfirmed messages that an actor with 
        # AtLeastOnceDelivery is allowed to hold in memory.
        max-unconfirmed-messages = 100000
    }
    # Default persistent extension thread pools.
    dispatchers {
        # Dispatcher used by every plugin which does not declare explicit
        # `plugin-dispatcher` field.
        default-plugin-dispatcher {
            type = PinnedDispatcher
            executor = "thread-pool-executor"
        }
        # Default dispatcher for message replay.
        default-replay-dispatcher {
            type = Dispatcher
            executor = "fork-join-executor"
            fork-join-executor {
                parallelism-min = 2
                parallelism-max = 8
            }
        }
        # Default dispatcher for streaming snapshot IO
        default-stream-dispatcher {
            type = Dispatcher
            executor = "fork-join-executor"
            fork-join-executor {
                parallelism-min = 2
                parallelism-max = 8
            }
        }
    }

    # Fallback settings for journal plugin configurations.
    # These settings are used if they are not defined in plugin config section.
    journal-plugin-fallback {

      # Fully qualified class name providing journal plugin api implementation.
      # It is mandatory to specify this property.
      # The class must have a constructor without parameters or constructor with
      # one `com.typesafe.config.Config` parameter.
      class = ""

      # Dispatcher for the plugin actor.
      plugin-dispatcher = "akka.persistence.dispatchers.default-plugin-dispatcher"

      # Dispatcher for message replay.
      replay-dispatcher = "akka.persistence.dispatchers.default-replay-dispatcher"

      # Removed: used to be the Maximum size of a persistent message batch written to the journal.
      # Now this setting is without function, PersistentActor will write as many messages
      # as it has accumulated since the last write.
      max-message-batch-size = 200

      # If there is more time in between individual events gotten from the journal
      # recovery than this the recovery will fail.
      # Note that it also affects reading the snapshot before replaying events on
      # top of it, even though it is configured for the journal.
      recovery-event-timeout = 30s

      circuit-breaker {
        max-failures = 10
        call-timeout = 10s
        reset-timeout = 30s
      }

      # The replay filter can detect a corrupt event stream by inspecting
      # sequence numbers and writerUuid when replaying events.
      replay-filter {
        # What the filter should do when detecting invalid events.
        # Supported values:
        # `repair-by-discard-old` : discard events from old writers,
        #                           warning is logged
        # `fail` : fail the replay, error is logged
        # `warn` : log warning but emit events untouched
        # `off` : disable this feature completely
        mode = repair-by-discard-old

        # It uses a look ahead buffer for analyzing the events.
        # This defines the size (in number of events) of the buffer.
        window-size = 100

        # How many old writerUuid to remember
        max-old-writers = 10

        # Set this to `on` to enable detailed debug logging of each
        # replayed event.
        debug = off
      }
    }

    # Fallback settings for snapshot store plugin configurations
    # These settings are used if they are not defined in plugin config section.
    snapshot-store-plugin-fallback {

      # Fully qualified class name providing snapshot store plugin api
      # implementation. It is mandatory to specify this property if
      # snapshot store is enabled.
      # The class must have a constructor without parameters or constructor with
      # one `com.typesafe.config.Config` parameter.
      class = ""

      # Dispatcher for the plugin actor.
      plugin-dispatcher = "akka.persistence.dispatchers.default-plugin-dispatcher"

      circuit-breaker {
        max-failures = 5
        call-timeout = 20s
        reset-timeout = 60s
      }
    }

  fsm {
    # PersistentFSM saves snapshots after this number of persistent
    # events. Snapshots are used to reduce recovery times.
    # When you disable this feature, specify snapshot-after = off.
    # To enable the feature, specify a number like snapshot-after = 1000
    # which means a snapshot is taken after persisting every 1000 events.
    snapshot-after = off
  }
}

# Protobuf serialization for the persistent extension messages.
akka.actor {
    serializers {
        akka-persistence-message = "akka.persistence.serialization.MessageSerializer"
        akka-persistence-snapshot = "akka.persistence.serialization.SnapshotSerializer"
    }
    serialization-bindings {
        "akka.persistence.serialization.Message" = akka-persistence-message
        "akka.persistence.serialization.Snapshot" = akka-persistence-snapshot
    }
    serialization-identifiers {
        "akka.persistence.serialization.MessageSerializer" = 7
        "akka.persistence.serialization.SnapshotSerializer" = 8
    }
}


###################################################
# Persistence plugins included with the extension #
###################################################

# In-memory journal plugin.
akka.persistence.journal.inmem {
    # Class name of the plugin.
    class = "akka.persistence.journal.inmem.InmemJournal"
    # Dispatcher for the plugin actor.
    plugin-dispatcher = "akka.actor.default-dispatcher"

    # Turn this on to test serialization of the events
    test-serialization = off
}

# Local file system snapshot store plugin.
akka.persistence.snapshot-store.local {
    # Class name of the plugin.
    class = "akka.persistence.snapshot.local.LocalSnapshotStore"
    # Dispatcher for the plugin actor.
    plugin-dispatcher = "akka.persistence.dispatchers.default-plugin-dispatcher"
    # Dispatcher for streaming snapshot IO.
    stream-dispatcher = "akka.persistence.dispatchers.default-stream-dispatcher"
    # Storage location of snapshot files.
    dir = "snapshots"
    # Number load attempts when recovering from the latest snapshot fails
    # yet older snapshot files are available. Each recovery attempt will try
    # to recover using an older than previously failed-on snapshot file 
    # (if any are present). If all attempts fail the recovery will fail and
    # the persistent actor will be stopped.
    max-load-attempts = 3
}

# LevelDB journal plugin.
# Note: this plugin requires explicit LevelDB dependency, see below. 
akka.persistence.journal.leveldb {
    # Class name of the plugin.
    class = "akka.persistence.journal.leveldb.LeveldbJournal"
    # Dispatcher for the plugin actor.
    plugin-dispatcher = "akka.persistence.dispatchers.default-plugin-dispatcher"
    # Dispatcher for message replay.
    replay-dispatcher = "akka.persistence.dispatchers.default-replay-dispatcher"
    # Storage location of LevelDB files.
    dir = "journal"
    # Use fsync on write.
    fsync = on
    # Verify checksum on read.
    checksum = off
    # Native LevelDB (via JNI) or LevelDB Java port.
    native = on
    # Number of deleted messages per persistence id that will trigger journal compaction
    compaction-intervals {
    }
}

# Shared LevelDB journal plugin (for testing only).
# Note: this plugin requires explicit LevelDB dependency, see below. 
akka.persistence.journal.leveldb-shared {
    # Class name of the plugin.
    class = "akka.persistence.journal.leveldb.SharedLeveldbJournal"
    # Dispatcher for the plugin actor.
    plugin-dispatcher = "akka.actor.default-dispatcher"
    # Timeout for async journal operations.
    timeout = 10s
    store {
        # Dispatcher for shared store actor.
        store-dispatcher = "akka.persistence.dispatchers.default-plugin-dispatcher"
        # Dispatcher for message replay.
        replay-dispatcher = "akka.persistence.dispatchers.default-replay-dispatcher"
        # Storage location of LevelDB files.
        dir = "journal"
        # Use fsync on write.
        fsync = on
        # Verify checksum on read.
        checksum = off
        # Native LevelDB (via JNI) or LevelDB Java port.
        native = on
        # Number of deleted messages per persistence id that will trigger journal compaction
        compaction-intervals {
        }
    }
}

akka.persistence.journal.proxy {
  # Class name of the plugin.
  class = "akka.persistence.journal.PersistencePluginProxy"
  # Dispatcher for the plugin actor.
  plugin-dispatcher = "akka.actor.default-dispatcher"
  # Set this to on in the configuration of the ActorSystem
  # that will host the target journal
  start-target-journal = off
  # The journal plugin config path to use for the target journal
  target-journal-plugin = ""
  # The address of the proxy to connect to from other nodes. Optional setting.
  target-journal-address = ""
  # Initialization timeout of target lookup
  init-timeout = 10s
}

akka.persistence.snapshot-store.proxy {
  # Class name of the plugin.
  class = "akka.persistence.journal.PersistencePluginProxy"
  # Dispatcher for the plugin actor.
  plugin-dispatcher = "akka.actor.default-dispatcher"
  # Set this to on in the configuration of the ActorSystem
  # that will host the target snapshot-store
  start-target-snapshot-store = off
  # The journal plugin config path to use for the target snapshot-store
  target-snapshot-store-plugin = ""
  # The address of the proxy to connect to from other nodes. Optional setting.
  target-snapshot-store-address = ""
  # Initialization timeout of target lookup
  init-timeout = 10s
}

# LevelDB persistence requires the following dependency declarations:
#
# SBT:
#       "org.iq80.leveldb"            % "leveldb"          % "0.7"
#       "org.fusesource.leveldbjni"   % "leveldbjni-all"   % "1.8"
#
# Maven:
#        <dependency>
#            <groupId>org.iq80.leveldb</groupId>
#            <artifactId>leveldb</artifactId>
#            <version>0.7</version>
#        </dependency>
#        <dependency>
#            <groupId>org.fusesource.leveldbjni</groupId>
#            <artifactId>leveldbjni-all</artifactId>
#            <version>1.8</version>
#        </dependency>

akka-persistence-query

#######################################################
# Akka Persistence Query Reference Configuration File #
#######################################################

# This is the reference config file that contains all the default settings.
# Make your edits in your application.conf in order to override these settings.

#//#query-leveldb
# Configuration for the LeveldbReadJournal
akka.persistence.query.journal.leveldb {
  # Implementation class of the LevelDB ReadJournalProvider
  class = "akka.persistence.query.journal.leveldb.LeveldbReadJournalProvider"
  
  # Absolute path to the write journal plugin configuration entry that this 
  # query journal will connect to. That must be a LeveldbJournal or SharedLeveldbJournal.
  # If undefined (or "") it will connect to the default journal as specified by the
  # akka.persistence.journal.plugin property.
  write-plugin = ""
  
  # The LevelDB write journal is notifying the query side as soon as things
  # are persisted, but for efficiency reasons the query side retrieves the events 
  # in batches that sometimes can be delayed up to the configured `refresh-interval`.
  refresh-interval = 3s
  
  # How many events to fetch in one query (replay) and keep buffered until they
  # are delivered downstreams.
  max-buffer-size = 100
}
#//#query-leveldb

akka-remote artery

#####################################
# Akka Remote Reference Config File #
#####################################

# This is the reference config file that contains all the default settings.
# Make your edits/overrides in your application.conf.

# comments about akka.actor settings left out where they are already in akka-
# actor.jar, because otherwise they would be repeated in config rendering.
#
# For the configuration of the new remoting implementation (Artery) please look
# at the bottom section of this file as it is listed separately.

akka {

  actor {

    serializers {
      akka-containers = "akka.remote.serialization.MessageContainerSerializer"
      akka-misc = "akka.remote.serialization.MiscMessageSerializer"
      artery = "akka.remote.serialization.ArteryMessageSerializer"
      proto = "akka.remote.serialization.ProtobufSerializer"
      daemon-create = "akka.remote.serialization.DaemonMsgCreateSerializer"
      akka-system-msg = "akka.remote.serialization.SystemMessageSerializer"
    }

    serialization-bindings {
      "akka.actor.ActorSelectionMessage" = akka-containers

      "akka.remote.DaemonMsgCreate" = daemon-create

      "akka.remote.artery.ArteryMessage" = artery

      # Since akka.protobuf.Message does not extend Serializable but
      # GeneratedMessage does, need to use the more specific one here in order
      # to avoid ambiguity.
      # This is only loaded if akka-protobuf is on the classpath
      # It should not be used and users should migrate to using the protobuf classes
      # directly
      # Remove in 2.7
      "akka.protobuf.GeneratedMessage" = proto

      "akka.protobufv3.internal.GeneratedMessageV3" = proto

      # Since com.google.protobuf.Message does not extend Serializable but
      # GeneratedMessage does, need to use the more specific one here in order
      # to avoid ambiguity.
      # This com.google.protobuf serialization binding is only used if the class can be loaded,
      # i.e. com.google.protobuf dependency has been added in the application project.
      "com.google.protobuf.GeneratedMessage" = proto
      "com.google.protobuf.GeneratedMessageV3" = proto

      "akka.actor.Identify" = akka-misc
      "akka.actor.ActorIdentity" = akka-misc
      "scala.Some" = akka-misc
      "scala.None$" = akka-misc
      "java.util.Optional" = akka-misc
      "akka.actor.Status$Success" = akka-misc
      "akka.actor.Status$Failure" = akka-misc
      "akka.actor.ActorRef" = akka-misc
      "akka.actor.PoisonPill$" = akka-misc
      "akka.actor.Kill$" = akka-misc
      "akka.remote.RemoteWatcher$Heartbeat$" = akka-misc
      "akka.remote.RemoteWatcher$HeartbeatRsp" = akka-misc
      "akka.Done" = akka-misc
      "akka.NotUsed" = akka-misc
      "akka.actor.Address" = akka-misc
      "akka.remote.UniqueAddress" = akka-misc

      "akka.actor.ActorInitializationException" = akka-misc
      "akka.actor.IllegalActorStateException" = akka-misc
      "akka.actor.ActorKilledException" = akka-misc
      "akka.actor.InvalidActorNameException" = akka-misc
      "akka.actor.InvalidMessageException" = akka-misc
      "java.util.concurrent.TimeoutException" = akka-misc
      "akka.remote.serialization.ThrowableNotSerializableException" = akka-misc

      "akka.actor.LocalScope$" = akka-misc
      "akka.remote.RemoteScope" = akka-misc

      "com.typesafe.config.impl.SimpleConfig" = akka-misc
      "com.typesafe.config.Config" = akka-misc

      "akka.routing.FromConfig" = akka-misc
      "akka.routing.DefaultResizer" = akka-misc
      "akka.routing.BalancingPool" = akka-misc
      "akka.routing.BroadcastGroup" = akka-misc
      "akka.routing.BroadcastPool" = akka-misc
      "akka.routing.RandomGroup" = akka-misc
      "akka.routing.RandomPool" = akka-misc
      "akka.routing.RoundRobinGroup" = akka-misc
      "akka.routing.RoundRobinPool" = akka-misc
      "akka.routing.ScatterGatherFirstCompletedGroup" = akka-misc
      "akka.routing.ScatterGatherFirstCompletedPool" = akka-misc
      "akka.routing.SmallestMailboxPool" = akka-misc
      "akka.routing.TailChoppingGroup" = akka-misc
      "akka.routing.TailChoppingPool" = akka-misc
      "akka.remote.routing.RemoteRouterConfig" = akka-misc

      "akka.dispatch.sysmsg.SystemMessage" = akka-system-msg

      # Java Serializer is by default used for exceptions and will by default
      # not be allowed to be serialized, but in certain cases they are replaced
      # by `akka.remote.serialization.ThrowableNotSerializableException` if
      # no specific serializer has been defined:
      # - when wrapped in `akka.actor.Status.Failure` for ask replies
      # - when wrapped in system messages for exceptions from remote deployed child actors
      #
      # It's recommended that you implement custom serializer for exceptions that are
      # sent remotely, You can add binding to akka-misc (MiscMessageSerializerSpec) for the
      # exceptions that have a constructor with single message String or constructor with
      # message String as first parameter and cause Throwable as second parameter. Note that it's not
      # safe to add this binding for general exceptions such as IllegalArgumentException
      # because it may have a subclass without required constructor.
      "java.lang.Throwable" = java
    }

    serialization-identifiers {
      "akka.remote.serialization.ProtobufSerializer" = 2
      "akka.remote.serialization.DaemonMsgCreateSerializer" = 3
      "akka.remote.serialization.MessageContainerSerializer" = 6
      "akka.remote.serialization.MiscMessageSerializer" = 16
      "akka.remote.serialization.ArteryMessageSerializer" = 17

      "akka.remote.serialization.SystemMessageSerializer" = 22

      # deprecated in 2.6.0, moved to akka-actor
      "akka.remote.serialization.LongSerializer" = 18
      # deprecated in 2.6.0, moved to akka-actor
      "akka.remote.serialization.IntSerializer" = 19
      # deprecated in 2.6.0, moved to akka-actor
      "akka.remote.serialization.StringSerializer" = 20
      # deprecated in 2.6.0, moved to akka-actor
      "akka.remote.serialization.ByteStringSerializer" = 21
    }

    deployment {

      default {

        # if this is set to a valid remote address, the named actor will be
        # deployed at that node e.g. "akka://[email protected]:port"
        remote = ""

        target {

          # A list of hostnames and ports for instantiating the children of a
          # router
          #   The format should be on "akka://[email protected]:port", where:
          #    - sys is the remote actor system name
          #    - hostname can be either hostname or IP address the remote actor
          #      should connect to
          #    - port should be the port for the remote server on the other node
          # The number of actor instances to be spawned is still taken from the
          # nr-of-instances setting as for local routers; the instances will be
          # distributed round-robin among the given nodes.
          nodes = []

        }
      }
    }
  }

  remote {
    ### Settings shared by classic remoting and Artery (the new implementation of remoting)

    # Using remoting directly is typically not desirable, so a warning will
    # be shown to make this clear. Set this setting to 'off' to suppress that
    # warning.
    warn-about-direct-use = on


    # If Cluster is not used, remote watch and deployment are disabled.
    # To optionally use them while not using Cluster, set to 'on'.
    use-unsafe-remote-features-outside-cluster = off

    # A warning will be logged on remote watch attempts if Cluster
    # is not in use and 'use-unsafe-remote-features-outside-cluster'
    # is 'off'. Set this to 'off' to suppress these.
    warn-unsafe-watch-outside-cluster = on

    # Settings for the Phi accrual failure detector (http://www.jaist.ac.jp/~defago/files/pdf/IS_RR_2004_010.pdf
    # [Hayashibara et al]) used for remote death watch.
    # The default PhiAccrualFailureDetector will trigger if there are no heartbeats within
    # the duration heartbeat-interval + acceptable-heartbeat-pause + threshold_adjustment,
    # i.e. around 12.5 seconds with default settings.
    watch-failure-detector {

      # FQCN of the failure detector implementation.
      # It must implement akka.remote.FailureDetector and have
      # a public constructor with a com.typesafe.config.Config and
      # akka.actor.EventStream parameter.
      implementation-class = "akka.remote.PhiAccrualFailureDetector"

      # How often keep-alive heartbeat messages should be sent to each connection.
      heartbeat-interval = 1 s

      # Defines the failure detector threshold.
      # A low threshold is prone to generate many wrong suspicions but ensures
      # a quick detection in the event of a real crash. Conversely, a high
      # threshold generates fewer mistakes but needs more time to detect
      # actual crashes.
      threshold = 10.0

      # Number of the samples of inter-heartbeat arrival times to adaptively
      # calculate the failure timeout for connections.
      max-sample-size = 200

      # Minimum standard deviation to use for the normal distribution in
      # AccrualFailureDetector. Too low standard deviation might result in
      # too much sensitivity for sudden, but normal, deviations in heartbeat
      # inter arrival times.
      min-std-deviation = 100 ms

      # Number of potentially lost/delayed heartbeats that will be
      # accepted before considering it to be an anomaly.
      # This margin is important to be able to survive sudden, occasional,
      # pauses in heartbeat arrivals, due to for example garbage collect or
      # network drop.
      acceptable-heartbeat-pause = 10 s


      # How often to check for nodes marked as unreachable by the failure
      # detector
      unreachable-nodes-reaper-interval = 1s

      # After the heartbeat request has been sent the first failure detection
      # will start after this period, even though no heartbeat mesage has
      # been received.
      expected-response-after = 1 s

    }

    # remote deployment configuration section
    deployment {
      # If true, will only allow specific classes to be instanciated on this system via remote deployment
      enable-whitelist = off

      whitelist = []
    }

    ### Default dispatcher for the remoting subsystem
    default-remote-dispatcher {
      type = Dispatcher
      executor = "fork-join-executor"
      fork-join-executor {
        parallelism-min = 2
        parallelism-factor = 0.5
        parallelism-max = 16
      }
      throughput = 10
    }
akka {

  remote {

    ### Configuration for Artery, the new implementation of remoting
    artery {

      # Disable artery with this flag
      enabled = on

      # Select the underlying transport implementation.
      #
      # Possible values: aeron-udp, tcp, tls-tcp
      # See https://doc.akka.io/docs/akka/current/remoting-artery.html#selecting-a-transport for the tradeoffs
      # for each transport
      transport = tcp

      # Canonical address is the address other clients should connect to.
      # Artery transport will expect messages to this address.
      canonical {

        # The default remote server port clients should connect to.
        # Default is 25520, use 0 if you want a random available port
        # This port needs to be unique for each actor system on the same machine.
        port = 25520

        # Hostname clients should connect to. Can be set to an ip, hostname
        # or one of the following special values:
        #   "<getHostAddress>"   InetAddress.getLocalHost.getHostAddress
        #   "<getHostName>"      InetAddress.getLocalHost.getHostName
        #
        hostname = "<getHostAddress>"
      }

      # Use these settings to bind a network interface to a different address
      # than artery expects messages at. This may be used when running Akka
      # nodes in a separated networks (under NATs or in containers). If canonical
      # and bind addresses are different, then network configuration that relays
      # communications from canonical to bind addresses is expected.
      bind {

        # Port to bind a network interface to. Can be set to a port number
        # of one of the following special values:
        #   0    random available port
        #   ""   akka.remote.artery.canonical.port
        #
        port = ""

        # Hostname to bind a network interface to. Can be set to an ip, hostname
        # or one of the following special values:
        #   "0.0.0.0"            all interfaces
        #   ""                   akka.remote.artery.canonical.hostname
        #   "<getHostAddress>"   InetAddress.getLocalHost.getHostAddress
        #   "<getHostName>"      InetAddress.getLocalHost.getHostName
        #
        hostname = ""

        # Time to wait for Aeron/TCP to bind
        bind-timeout = 3s
      }


      # Actor paths to use the large message stream for when a message
      # is sent to them over remoting. The large message stream dedicated
      # is separate from "normal" and system messages so that sending a
      # large message does not interfere with them.
      # Entries should be the full path to the actor. Wildcards in the form of "*"
      # can be supplied at any place and matches any name at that segment -
      # "/user/supervisor/actor/*" will match any direct child to actor,
      # while "/supervisor/*/child" will match any grandchild to "supervisor" that
      # has the name "child"
      # Entries have to be specified on both the sending and receiving side.
      # Messages sent to ActorSelections will not be passed through the large message
      # stream, to pass such messages through the large message stream the selections
      # but must be resolved to ActorRefs first.
      large-message-destinations = []

      # Enable untrusted mode, which discards inbound system messages, PossiblyHarmful and
      # ActorSelection messages. E.g. remote watch and remote deployment will not work.
      # ActorSelection messages can be enabled for specific paths with the trusted-selection-paths
      untrusted-mode = off

      # When 'untrusted-mode=on' inbound actor selections are by default discarded.
      # Actors with paths defined in this white list are granted permission to receive actor
      # selections messages.
      # E.g. trusted-selection-paths = ["/user/receptionist", "/user/namingService"]
      trusted-selection-paths = []

      # If this is "on", all inbound remote messages will be logged at DEBUG level,
      # if off then they are not logged
      log-received-messages = off

      # If this is "on", all outbound remote messages will be logged at DEBUG level,
      # if off then they are not logged
      log-sent-messages = off

      advanced {

        # Maximum serialized message size, including header data.
        maximum-frame-size = 256 KiB

        # Direct byte buffers are reused in a pool with this maximum size.
        # Each buffer has the size of 'maximum-frame-size'.
        # This is not a hard upper limit on number of created buffers. Additional
        # buffers will be created if needed, e.g. when using many outbound
        # associations at the same time. Such additional buffers will be garbage
        # collected, which is not as efficient as reusing buffers in the pool.
        buffer-pool-size = 128

        # Maximum serialized message size for the large messages, including header data.
        # It is currently restricted to 1/8th the size of a term buffer that can be
        # configured by setting the 'aeron.term.buffer.length' system property.
        # See 'large-message-destinations'.
        maximum-large-frame-size = 2 MiB

        # Direct byte buffers for the large messages are reused in a pool with this maximum size.
        # Each buffer has the size of 'maximum-large-frame-size'.
        # See 'large-message-destinations'.
        # This is not a hard upper limit on number of created buffers. Additional
        # buffers will be created if needed, e.g. when using many outbound
        # associations at the same time. Such additional buffers will be garbage
        # collected, which is not as efficient as reusing buffers in the pool.
        large-buffer-pool-size = 32

        # For enabling testing features, such as blackhole in akka-remote-testkit.
        test-mode = off

        # Settings for the materializer that is used for the remote streams.
        materializer = ${akka.stream.materializer}

        # Remoting will use the given dispatcher for the ordinary and large message
        # streams.
        use-dispatcher = "akka.remote.default-remote-dispatcher"

        # Remoting will use the given dispatcher for the control stream.
        # It can be good to not use the same dispatcher for the control stream as
        # the dispatcher for the ordinary message stream so that heartbeat messages
        # are not disturbed.
        use-control-stream-dispatcher = "akka.actor.internal-dispatcher"


        # Total number of inbound lanes, shared among all inbound associations. A value
        # greater than 1 means that deserialization can be performed in parallel for
        # different destination actors. The selection of lane is based on consistent
        # hashing of the recipient ActorRef to preserve message ordering per receiver.
        # Lowest latency can be achieved with inbound-lanes=1 because of one less
        # asynchronous boundary.
        inbound-lanes = 4

        # Number of outbound lanes for each outbound association. A value greater than 1
        # means that serialization and other work can be performed in parallel for different
        # destination actors. The selection of lane is based on consistent hashing of the
        # recipient ActorRef to preserve message ordering per receiver. Note that messages
        # for different destination systems (hosts) are handled by different streams also
        # when outbound-lanes=1. Lowest latency can be achieved with outbound-lanes=1
        # because of one less asynchronous boundary.
        outbound-lanes = 1

        # Size of the send queue for outgoing messages. Messages will be dropped if
        # the queue becomes full. This may happen if you send a burst of many messages
        # without end-to-end flow control. Note that there is one such queue per
        # outbound association. The trade-off of using a larger queue size is that
        # it consumes more memory, since the queue is based on preallocated array with
        # fixed size.
        outbound-message-queue-size = 3072

        # Size of the send queue for outgoing control messages, such as system messages.
        # If this limit is reached the remote system is declared to be dead and its UID
        # marked as quarantined. Note that there is one such queue per outbound association.
        # It is a linked queue so it will not use more memory than needed but by increasing
        # too much you may risk OutOfMemoryError in the worst case.
        outbound-control-queue-size = 20000

        # Size of the send queue for outgoing large messages. Messages will be dropped if
        # the queue becomes full. This may happen if you send a burst of many messages
        # without end-to-end flow control. Note that there is one such queue per
        # outbound association.
        # It is a linked queue so it will not use more memory than needed but by increasing
        # too much you may risk OutOfMemoryError, especially since the message payload
        # of these messages may be large.
        outbound-large-message-queue-size = 256

        # This setting defines the maximum number of unacknowledged system messages
        # allowed for a remote system. If this limit is reached the remote system is
        # declared to be dead and its UID marked as quarantined.
        system-message-buffer-size = 20000

        # unacknowledged system messages are re-delivered with this interval
        system-message-resend-interval = 1 second



        # The timeout for outbound associations to perform the initial handshake.
        # This timeout must be greater than the 'image-liveness-timeout' when
        # transport is aeron-udp.
        handshake-timeout = 20 seconds

        # incomplete initial handshake attempt is retried with this interval
        handshake-retry-interval = 1 second

        # Handshake requests are performed periodically with this interval,
        # also after the handshake has been completed to be able to establish
        # a new session with a restarted destination system.
        inject-handshake-interval = 1 second


        # System messages that are not acknowledged after re-sending for this period are
        # dropped and will trigger quarantine. The value should be longer than the length
        # of a network partition that you need to survive.
        give-up-system-message-after = 6 hours

        # Outbound streams are stopped when they haven't been used for this duration.
        # They are started again when new messages are sent.
        stop-idle-outbound-after = 5 minutes

        # Outbound streams are quarantined when they haven't been used for this duration
        # to cleanup resources used by the association, such as compression tables.
        # This will cleanup association to crashed systems that didn't announce their
        # termination.
        # The value should be longer than the length of a network partition that you
        # need to survive.
        # The value must also be greater than stop-idle-outbound-after.
        # Once every 1/10 of this duration an extra handshake message will be sent.
        # Therfore it's also recommended to use a value that is greater than 10 times
        # the stop-idle-outbound-after, since otherwise the idle streams will not be
        # stopped.
        quarantine-idle-outbound-after = 6 hours

        # Stop outbound stream of a quarantined association after this idle timeout, i.e.
        # when not used any more.
        stop-quarantined-after-idle = 3 seconds

        # After catastrophic communication failures that could result in the loss of system
        # messages or after the remote DeathWatch triggers the remote system gets
        # quarantined to prevent inconsistent behavior.
        # This setting controls how long the quarantined association will be kept around
        # before being removed to avoid long-term memory leaks. It must be quarantined
        # and also unused for this duration before it's removed. When removed the historical
        # information about which UIDs that were quarantined for that hostname:port is
        # gone which could result in communication with a previously quarantined node
        # if it wakes up again. Therfore this shouldn't be set too low.
        remove-quarantined-association-after = 1 h

        # during ActorSystem termination the remoting will wait this long for
        # an acknowledgment by the destination system that flushing of outstanding
        # remote messages has been completed
        shutdown-flush-timeout = 1 second

        # See 'inbound-max-restarts'
        inbound-restart-timeout = 5 seconds

        # Max number of restarts within 'inbound-restart-timeout' for the inbound streams.
        # If more restarts occurs the ActorSystem will be terminated.
        inbound-max-restarts = 5

        # Retry outbound connection after this backoff.
        # Only used when transport is tcp or tls-tcp.
        outbound-restart-backoff = 1 second

        # See 'outbound-max-restarts'
        outbound-restart-timeout = 5 seconds

        # Max number of restarts within 'outbound-restart-timeout' for the outbound streams.
        # If more restarts occurs the ActorSystem will be terminated.
        outbound-max-restarts = 5

        # compression of common strings in remoting messages, like actor destinations, serializers etc
        compression {

          actor-refs {
            # Max number of compressed actor-refs
            # Note that compression tables are "rolling" (i.e. a new table replaces the old
            # compression table once in a while), and this setting is only about the total number
            # of compressions within a single such table.
            # Must be a positive natural number.
            max = 256

            # interval between new table compression advertisements.
            # this means the time during which we collect heavy-hitter data and then turn it into a compression table.
            advertisement-interval = 1 minute
          }
          manifests {
            # Max number of compressed manifests
            # Note that compression tables are "rolling" (i.e. a new table replaces the old
            # compression table once in a while), and this setting is only about the total number
            # of compressions within a single such table.
            # Must be a positive natural number.
            max = 256

            # interval between new table compression advertisements.
            # this means the time during which we collect heavy-hitter data and then turn it into a compression table.
            advertisement-interval = 1 minute
          }
        }

        # List of fully qualified class names of remote instruments which should
        # be initialized and used for monitoring of remote messages.
        # The class must extend akka.remote.artery.RemoteInstrument and
        # have a public constructor with empty parameters or one ExtendedActorSystem
        # parameter.
        # A new instance of RemoteInstrument will be created for each encoder and decoder.
        # It's only called from the stage, so if it dosn't delegate to any shared instance
        # it doesn't have to be thread-safe.
        # Refer to `akka.remote.artery.RemoteInstrument` for more information.
        instruments = ${?akka.remote.artery.advanced.instruments} []

        # Only used when transport is aeron-udp
        aeron {
          # Only used when transport is aeron-udp.
          log-aeron-counters = false

          # Controls whether to start the Aeron media driver in the same JVM or use external
          # process. Set to 'off' when using external media driver, and then also set the
          # 'aeron-dir'.
          # Only used when transport is aeron-udp.
          embedded-media-driver = on

          # Directory used by the Aeron media driver. It's mandatory to define the 'aeron-dir'
          # if using external media driver, i.e. when 'embedded-media-driver = off'.
          # Embedded media driver will use a this directory, or a temporary directory if this
          # property is not defined (empty).
          # Only used when transport is aeron-udp.
          aeron-dir = ""

          # Whether to delete aeron embedded driver directory upon driver stop.
          # Only used when transport is aeron-udp.
          delete-aeron-dir = yes

          # Level of CPU time used, on a scale between 1 and 10, during backoff/idle.
          # The tradeoff is that to have low latency more CPU time must be used to be
          # able to react quickly on incoming messages or send as fast as possible after
          # backoff backpressure.
          # Level 1 strongly prefer low CPU consumption over low latency.
          # Level 10 strongly prefer low latency over low CPU consumption.
          # Only used when transport is aeron-udp.
          idle-cpu-level = 5

          # messages that are not accepted by Aeron are dropped after retrying for this period
          # Only used when transport is aeron-udp.
          give-up-message-after = 60 seconds

          # Timeout after which aeron driver has not had keepalive messages
          # from a client before it considers the client dead.
          # Only used when transport is aeron-udp.
          client-liveness-timeout = 20 seconds

          # Timout after after which an uncommitted publication will be unblocked
          # Only used when transport is aeron-udp.
          publication-unblock-timeout = 40 seconds

          # Timeout for each the INACTIVE and LINGER stages an aeron image
          # will be retained for when it is no longer referenced.
          # This timeout must be less than the 'handshake-timeout'.
          # Only used when transport is aeron-udp.
          image-liveness-timeout = 10 seconds

          # Timeout after which the aeron driver is considered dead
          # if it does not update its C'n'C timestamp.
          # Only used when transport is aeron-udp.
          driver-timeout = 20 seconds
        }

        # Only used when transport is tcp or tls-tcp.
        tcp {
          # Timeout of establishing outbound connections.
          connection-timeout = 5 seconds
        }


      }

      # SSL configuration that is used when transport=tls-tcp.
      ssl {
        # Factory of SSLEngine.
        # Must implement akka.remote.artery.tcp.SSLEngineProvider and have a public
        # constructor with an ActorSystem parameter.
        # The default ConfigSSLEngineProvider is configured by properties in section
        # akka.remote.artery.ssl.config-ssl-engine
        ssl-engine-provider = akka.remote.artery.tcp.ConfigSSLEngineProvider

        # Config of akka.remote.artery.tcp.ConfigSSLEngineProvider
        config-ssl-engine {

          # This is the Java Key Store used by the server connection
          key-store = "keystore"

          # This password is used for decrypting the key store
          # Use substitution from environment variables for passwords. Don't define
          # real passwords in config files. key-store-password=${SSL_KEY_STORE_PASSWORD}
          key-store-password = "changeme"

          # This password is used for decrypting the key
          # Use substitution from environment variables for passwords. Don't define
          # real passwords in config files. key-password=${SSL_KEY_PASSWORD}
          key-password = "changeme"

          # This is the Java Key Store used by the client connection
          trust-store = "truststore"

          # This password is used for decrypting the trust store
          # Use substitution from environment variables for passwords. Don't define
          # real passwords in config files. trust-store-password=${SSL_TRUST_STORE_PASSWORD}
          trust-store-password = "changeme"

          # Protocol to use for SSL encryption, choose from:
          # TLS 1.2 is available since JDK7, and default since JDK8:
          # https://blogs.oracle.com/java-platform-group/entry/java_8_will_use_tls
          protocol = "TLSv1.2"

          # Example: ["TLS_RSA_WITH_AES_128_CBC_SHA", "TLS_RSA_WITH_AES_256_CBC_SHA"]
          # You need to install the JCE Unlimited Strength Jurisdiction Policy
          # Files to use AES 256.
          # More info here:
          enabled-algorithms = ["TLS_RSA_WITH_AES_128_CBC_SHA"]

          # There are two options, and the default SecureRandom is recommended:
          # "" or "SecureRandom" => (default)
          # "SHA1PRNG" => Can be slow because of blocking issues on Linux
          #
          # Setting a value here may require you to supply the appropriate cipher
          # suite (see enabled-algorithms section above)
          random-number-generator = ""

          # Require mutual authentication between TLS peers
          #
          # Without mutual authentication only the peer that actively establishes a connection (TLS client side)
          # checks if the passive side (TLS server side) sends over a trusted certificate. With the flag turned on,
          # the passive side will also request and verify a certificate from the connecting peer.
          #
          # To prevent man-in-the-middle attacks this setting is enabled by default.
          require-mutual-authentication = on

          # Set this to `on` to verify hostnames with sun.security.util.HostnameChecker
          hostname-verification = off
        }

      }
    }
  }

}

akka-remote classic (deprecated)

#####################################
# Akka Remote Reference Config File #
#####################################

# This is the reference config file that contains all the default settings.
# Make your edits/overrides in your application.conf.

# comments about akka.actor settings left out where they are already in akka-
# actor.jar, because otherwise they would be repeated in config rendering.
#
# For the configuration of the new remoting implementation (Artery) please look
# at the bottom section of this file as it is listed separately.

akka {

  actor {

    serializers {
      akka-containers = "akka.remote.serialization.MessageContainerSerializer"
      akka-misc = "akka.remote.serialization.MiscMessageSerializer"
      artery = "akka.remote.serialization.ArteryMessageSerializer"
      proto = "akka.remote.serialization.ProtobufSerializer"
      daemon-create = "akka.remote.serialization.DaemonMsgCreateSerializer"
      akka-system-msg = "akka.remote.serialization.SystemMessageSerializer"
    }

    serialization-bindings {
      "akka.actor.ActorSelectionMessage" = akka-containers

      "akka.remote.DaemonMsgCreate" = daemon-create

      "akka.remote.artery.ArteryMessage" = artery

      # Since akka.protobuf.Message does not extend Serializable but
      # GeneratedMessage does, need to use the more specific one here in order
      # to avoid ambiguity.
      # This is only loaded if akka-protobuf is on the classpath
      # It should not be used and users should migrate to using the protobuf classes
      # directly
      # Remove in 2.7
      "akka.protobuf.GeneratedMessage" = proto

      "akka.protobufv3.internal.GeneratedMessageV3" = proto

      # Since com.google.protobuf.Message does not extend Serializable but
      # GeneratedMessage does, need to use the more specific one here in order
      # to avoid ambiguity.
      # This com.google.protobuf serialization binding is only used if the class can be loaded,
      # i.e. com.google.protobuf dependency has been added in the application project.
      "com.google.protobuf.GeneratedMessage" = proto
      "com.google.protobuf.GeneratedMessageV3" = proto

      "akka.actor.Identify" = akka-misc
      "akka.actor.ActorIdentity" = akka-misc
      "scala.Some" = akka-misc
      "scala.None$" = akka-misc
      "java.util.Optional" = akka-misc
      "akka.actor.Status$Success" = akka-misc
      "akka.actor.Status$Failure" = akka-misc
      "akka.actor.ActorRef" = akka-misc
      "akka.actor.PoisonPill$" = akka-misc
      "akka.actor.Kill$" = akka-misc
      "akka.remote.RemoteWatcher$Heartbeat$" = akka-misc
      "akka.remote.RemoteWatcher$HeartbeatRsp" = akka-misc
      "akka.Done" = akka-misc
      "akka.NotUsed" = akka-misc
      "akka.actor.Address" = akka-misc
      "akka.remote.UniqueAddress" = akka-misc

      "akka.actor.ActorInitializationException" = akka-misc
      "akka.actor.IllegalActorStateException" = akka-misc
      "akka.actor.ActorKilledException" = akka-misc
      "akka.actor.InvalidActorNameException" = akka-misc
      "akka.actor.InvalidMessageException" = akka-misc
      "java.util.concurrent.TimeoutException" = akka-misc
      "akka.remote.serialization.ThrowableNotSerializableException" = akka-misc

      "akka.actor.LocalScope$" = akka-misc
      "akka.remote.RemoteScope" = akka-misc

      "com.typesafe.config.impl.SimpleConfig" = akka-misc
      "com.typesafe.config.Config" = akka-misc

      "akka.routing.FromConfig" = akka-misc
      "akka.routing.DefaultResizer" = akka-misc
      "akka.routing.BalancingPool" = akka-misc
      "akka.routing.BroadcastGroup" = akka-misc
      "akka.routing.BroadcastPool" = akka-misc
      "akka.routing.RandomGroup" = akka-misc
      "akka.routing.RandomPool" = akka-misc
      "akka.routing.RoundRobinGroup" = akka-misc
      "akka.routing.RoundRobinPool" = akka-misc
      "akka.routing.ScatterGatherFirstCompletedGroup" = akka-misc
      "akka.routing.ScatterGatherFirstCompletedPool" = akka-misc
      "akka.routing.SmallestMailboxPool" = akka-misc
      "akka.routing.TailChoppingGroup" = akka-misc
      "akka.routing.TailChoppingPool" = akka-misc
      "akka.remote.routing.RemoteRouterConfig" = akka-misc

      "akka.dispatch.sysmsg.SystemMessage" = akka-system-msg

      # Java Serializer is by default used for exceptions and will by default
      # not be allowed to be serialized, but in certain cases they are replaced
      # by `akka.remote.serialization.ThrowableNotSerializableException` if
      # no specific serializer has been defined:
      # - when wrapped in `akka.actor.Status.Failure` for ask replies
      # - when wrapped in system messages for exceptions from remote deployed child actors
      #
      # It's recommended that you implement custom serializer for exceptions that are
      # sent remotely, You can add binding to akka-misc (MiscMessageSerializerSpec) for the
      # exceptions that have a constructor with single message String or constructor with
      # message String as first parameter and cause Throwable as second parameter. Note that it's not
      # safe to add this binding for general exceptions such as IllegalArgumentException
      # because it may have a subclass without required constructor.
      "java.lang.Throwable" = java
    }

    serialization-identifiers {
      "akka.remote.serialization.ProtobufSerializer" = 2
      "akka.remote.serialization.DaemonMsgCreateSerializer" = 3
      "akka.remote.serialization.MessageContainerSerializer" = 6
      "akka.remote.serialization.MiscMessageSerializer" = 16
      "akka.remote.serialization.ArteryMessageSerializer" = 17

      "akka.remote.serialization.SystemMessageSerializer" = 22

      # deprecated in 2.6.0, moved to akka-actor
      "akka.remote.serialization.LongSerializer" = 18
      # deprecated in 2.6.0, moved to akka-actor
      "akka.remote.serialization.IntSerializer" = 19
      # deprecated in 2.6.0, moved to akka-actor
      "akka.remote.serialization.StringSerializer" = 20
      # deprecated in 2.6.0, moved to akka-actor
      "akka.remote.serialization.ByteStringSerializer" = 21
    }

    deployment {

      default {

        # if this is set to a valid remote address, the named actor will be
        # deployed at that node e.g. "akka://[email protected]:port"
        remote = ""

        target {

          # A list of hostnames and ports for instantiating the children of a
          # router
          #   The format should be on "akka://[email protected]:port", where:
          #    - sys is the remote actor system name
          #    - hostname can be either hostname or IP address the remote actor
          #      should connect to
          #    - port should be the port for the remote server on the other node
          # The number of actor instances to be spawned is still taken from the
          # nr-of-instances setting as for local routers; the instances will be
          # distributed round-robin among the given nodes.
          nodes = []

        }
      }
    }
  }

  remote {
    ### Settings shared by classic remoting and Artery (the new implementation of remoting)

    # Using remoting directly is typically not desirable, so a warning will
    # be shown to make this clear. Set this setting to 'off' to suppress that
    # warning.
    warn-about-direct-use = on


    # If Cluster is not used, remote watch and deployment are disabled.
    # To optionally use them while not using Cluster, set to 'on'.
    use-unsafe-remote-features-outside-cluster = off

    # A warning will be logged on remote watch attempts if Cluster
    # is not in use and 'use-unsafe-remote-features-outside-cluster'
    # is 'off'. Set this to 'off' to suppress these.
    warn-unsafe-watch-outside-cluster = on

    # Settings for the Phi accrual failure detector (http://www.jaist.ac.jp/~defago/files/pdf/IS_RR_2004_010.pdf
    # [Hayashibara et al]) used for remote death watch.
    # The default PhiAccrualFailureDetector will trigger if there are no heartbeats within
    # the duration heartbeat-interval + acceptable-heartbeat-pause + threshold_adjustment,
    # i.e. around 12.5 seconds with default settings.
    watch-failure-detector {

      # FQCN of the failure detector implementation.
      # It must implement akka.remote.FailureDetector and have
      # a public constructor with a com.typesafe.config.Config and
      # akka.actor.EventStream parameter.
      implementation-class = "akka.remote.PhiAccrualFailureDetector"

      # How often keep-alive heartbeat messages should be sent to each connection.
      heartbeat-interval = 1 s

      # Defines the failure detector threshold.
      # A low threshold is prone to generate many wrong suspicions but ensures
      # a quick detection in the event of a real crash. Conversely, a high
      # threshold generates fewer mistakes but needs more time to detect
      # actual crashes.
      threshold = 10.0

      # Number of the samples of inter-heartbeat arrival times to adaptively
      # calculate the failure timeout for connections.
      max-sample-size = 200

      # Minimum standard deviation to use for the normal distribution in
      # AccrualFailureDetector. Too low standard deviation might result in
      # too much sensitivity for sudden, but normal, deviations in heartbeat
      # inter arrival times.
      min-std-deviation = 100 ms

      # Number of potentially lost/delayed heartbeats that will be
      # accepted before considering it to be an anomaly.
      # This margin is important to be able to survive sudden, occasional,
      # pauses in heartbeat arrivals, due to for example garbage collect or
      # network drop.
      acceptable-heartbeat-pause = 10 s


      # How often to check for nodes marked as unreachable by the failure
      # detector
      unreachable-nodes-reaper-interval = 1s

      # After the heartbeat request has been sent the first failure detection
      # will start after this period, even though no heartbeat mesage has
      # been received.
      expected-response-after = 1 s

    }

    # remote deployment configuration section
    deployment {
      # If true, will only allow specific classes to be instanciated on this system via remote deployment
      enable-whitelist = off

      whitelist = []
    }

    ### Default dispatcher for the remoting subsystem
    default-remote-dispatcher {
      type = Dispatcher
      executor = "fork-join-executor"
      fork-join-executor {
        parallelism-min = 2
        parallelism-factor = 0.5
        parallelism-max = 16
      }
      throughput = 10
    }

    ### Configuration for classic remoting. Classic remoting is deprecated, use artery.


    # If set to a nonempty string remoting will use the given dispatcher for
    # its internal actors otherwise the default dispatcher is used. Please note
    # that since remoting can load arbitrary 3rd party drivers (see
    # "enabled-transport" and "adapters" entries) it is not guaranteed that
    # every module will respect this setting.
    use-dispatcher = "akka.remote.default-remote-dispatcher"

    # Settings for the failure detector to monitor connections.
    # For TCP it is not important to have fast failure detection, since
    # most connection failures are captured by TCP itself.
    # The default DeadlineFailureDetector will trigger if there are no heartbeats within
    # the duration heartbeat-interval + acceptable-heartbeat-pause, i.e. 124 seconds
    # with the default settings.
    transport-failure-detector {

      # FQCN of the failure detector implementation.
      # It must implement akka.remote.FailureDetector and have
      # a public constructor with a com.typesafe.config.Config and
      # akka.actor.EventStream parameter.
      implementation-class = "akka.remote.DeadlineFailureDetector"

      # How often keep-alive heartbeat messages should be sent to each connection.
      heartbeat-interval = 4 s

      # Number of potentially lost/delayed heartbeats that will be
      # accepted before considering it to be an anomaly.
      # A margin to the `heartbeat-interval` is important to be able to survive sudden,
      # occasional, pauses in heartbeat arrivals, due to for example garbage collect or
      # network drop.
      acceptable-heartbeat-pause = 120 s
    }


    # Timeout after which the startup of the remoting subsystem is considered
    # to be failed. Increase this value if your transport drivers (see the
    # enabled-transports section) need longer time to be loaded.
    startup-timeout = 10 s

    # Timout after which the graceful shutdown of the remoting subsystem is
    # considered to be failed. After the timeout the remoting system is
    # forcefully shut down. Increase this value if your transport drivers
    # (see the enabled-transports section) need longer time to stop properly.
    shutdown-timeout = 10 s

    # Before shutting down the drivers, the remoting subsystem attempts to flush
    # all pending writes. This setting controls the maximum time the remoting is
    # willing to wait before moving on to shut down the drivers.
    flush-wait-on-shutdown = 2 s

    # Reuse inbound connections for outbound messages
    use-passive-connections = on

    # Controls the backoff interval after a refused write is reattempted.
    # (Transports may refuse writes if their internal buffer is full)
    backoff-interval = 5 ms

    # Acknowledgment timeout of management commands sent to the transport stack.
    command-ack-timeout = 30 s

    # The timeout for outbound associations to perform the handshake.
    # If the transport is akka.remote.classic.netty.tcp or akka.remote.classic.netty.ssl
    # the configured connection-timeout for the transport will be used instead.
    handshake-timeout = 15 s

    ### Security settings

    # Enable untrusted mode for full security of server managed actors, prevents
    # system messages to be send by clients, e.g. messages like 'Create',
    # 'Suspend', 'Resume', 'Terminate', 'Supervise', 'Link' etc.
    untrusted-mode = off

    # When 'untrusted-mode=on' inbound actor selections are by default discarded.
    # Actors with paths defined in this white list are granted permission to receive actor
    # selections messages.
    # E.g. trusted-selection-paths = ["/user/receptionist", "/user/namingService"]
    trusted-selection-paths = []

    ### Logging

    # If this is "on", Akka will log all inbound messages at DEBUG level,
    # if off then they are not logged
    log-received-messages = off

    # If this is "on", Akka will log all outbound messages at DEBUG level,
    # if off then they are not logged
    log-sent-messages = off

    # Sets the log granularity level at which Akka logs remoting events. This setting
    # can take the values OFF, ERROR, WARNING, INFO, DEBUG, or ON. For compatibility
    # reasons the setting "on" will default to "debug" level. Please note that the effective
    # logging level is still determined by the global logging level of the actor system:
    # for example debug level remoting events will be only logged if the system
    # is running with debug level logging.
    # Failures to deserialize received messages also fall under this flag.
    log-remote-lifecycle-events = on

    # Logging of message types with payload size in bytes larger than
    # this value. Maximum detected size per message type is logged once,
    # with an increase threshold of 10%.
    # By default this feature is turned off. Activate it by setting the property to
    # a value in bytes, such as 1000b. Note that for all messages larger than this
    # limit there will be extra performance and scalability cost.
    log-frame-size-exceeding = off

    # Log warning if the number of messages in the backoff buffer in the endpoint
    # writer exceeds this limit. It can be disabled by setting the value to off.
    log-buffer-size-exceeding = 50000

    # After failed to establish an outbound connection, the remoting will mark the
    # address as failed. This configuration option controls how much time should
    # be elapsed before reattempting a new connection. While the address is
    # gated, all messages sent to the address are delivered to dead-letters.
    # Since this setting limits the rate of reconnects setting it to a
    # very short interval (i.e. less than a second) may result in a storm of
    # reconnect attempts.
    retry-gate-closed-for = 5 s

    # After catastrophic communication failures that result in the loss of system
    # messages or after the remote DeathWatch triggers the remote system gets
    # quarantined to prevent inconsistent behavior.
    # This setting controls how long the Quarantine marker will be kept around
    # before being removed to avoid long-term memory leaks.
    # WARNING: DO NOT change this to a small value to re-enable communication with
    # quarantined nodes. Such feature is not supported and any behavior between
    # the affected systems after lifting the quarantine is undefined.
    prune-quarantine-marker-after = 5 d

    # If system messages have been exchanged between two systems (i.e. remote death
    # watch or remote deployment has been used) a remote system will be marked as
    # quarantined after the two system has no active association, and no
    # communication happens during the time configured here.
    # The only purpose of this setting is to avoid storing system message redelivery
    # data (sequence number state, etc.) for an undefined amount of time leading to long
    # term memory leak. Instead, if a system has been gone for this period,
    # or more exactly
    # - there is no association between the two systems (TCP connection, if TCP transport is used)
    # - neither side has been attempting to communicate with the other
    # - there are no pending system messages to deliver
    # for the amount of time configured here, the remote system will be quarantined and all state
    # associated with it will be dropped.
    #
    # Maximum value depends on the scheduler's max limit (default 248 days) and if configured
    # to a longer duration this feature will effectively be disabled. Setting the value to
    # 'off' will also disable the feature. Note that if disabled there is a risk of a long
    # term memory leak.
    quarantine-after-silence = 2 d

    # This setting defines the maximum number of unacknowledged system messages
    # allowed for a remote system. If this limit is reached the remote system is
    # declared to be dead and its UID marked as tainted.
    system-message-buffer-size = 20000

    # This setting defines the maximum idle time after an individual
    # acknowledgement for system messages is sent. System message delivery
    # is guaranteed by explicit acknowledgement messages. These acks are
    # piggybacked on ordinary traffic messages. If no traffic is detected
    # during the time period configured here, the remoting will send out
    # an individual ack.
    system-message-ack-piggyback-timeout = 0.3 s

    # This setting defines the time after internal management signals
    # between actors (used for DeathWatch and supervision) that have not been
    # explicitly acknowledged or negatively acknowledged are resent.
    # Messages that were negatively acknowledged are always immediately
    # resent.
    resend-interval = 2 s

    # Maximum number of unacknowledged system messages that will be resent
    # each 'resend-interval'. If you watch many (> 1000) remote actors you can
    # increase this value to for example 600, but a too large limit (e.g. 10000)
    # may flood the connection and might cause false failure detection to trigger.
    # Test such a configuration by watching all actors at the same time and stop
    # all watched actors at the same time.
    resend-limit = 200

    # WARNING: this setting should not be not changed unless all of its consequences
    # are properly understood which assumes experience with remoting internals
    # or expert advice.
    # This setting defines the time after redelivery attempts of internal management
    # signals are stopped to a remote system that has been not confirmed to be alive by
    # this system before.
    initial-system-message-delivery-timeout = 3 m

    ### Transports and adapters

    # List of the transport drivers that will be loaded by the remoting.
    # A list of fully qualified config paths must be provided where
    # the given configuration path contains a transport-class key
    # pointing to an implementation class of the Transport interface.
    # If multiple transports are provided, the address of the first
    # one will be used as a default address.
    enabled-transports = ["akka.remote.classic.netty.tcp"]

    # Transport drivers can be augmented with adapters by adding their
    # name to the applied-adapters setting in the configuration of a
    # transport. The available adapters should be configured in this
    # section by providing a name, and the fully qualified name of
    # their corresponding implementation. The class given here
    # must implement akka.akka.remote.transport.TransportAdapterProvider
    # and have public constructor without parameters.
    adapters {
      gremlin = "akka.remote.transport.FailureInjectorProvider"
      trttl = "akka.remote.transport.ThrottlerProvider"
    }

    ### Default configuration for the Netty based transport drivers

    netty.tcp {
      # The class given here must implement the akka.remote.transport.Transport
      # interface and offer a public constructor which takes two arguments:
      #  1) akka.actor.ExtendedActorSystem
      #  2) com.typesafe.config.Config
      transport-class = "akka.remote.transport.netty.NettyTransport"

      # Transport drivers can be augmented with adapters by adding their
      # name to the applied-adapters list. The last adapter in the
      # list is the adapter immediately above the driver, while
      # the first one is the top of the stack below the standard
      # Akka protocol
      applied-adapters = []

      # The default remote server port clients should connect to.
      # Default is 2552 (AKKA), use 0 if you want a random available port
      # This port needs to be unique for each actor system on the same machine.
      port = 2552

      # The hostname or ip clients should connect to.
      # InetAddress.getLocalHost.getHostAddress is used if empty
      hostname = ""

      # Use this setting to bind a network interface to a different port
      # than remoting protocol expects messages at. This may be used
      # when running akka nodes in a separated networks (under NATs or docker containers).
      # Use 0 if you want a random available port. Examples:
      #
      # akka.remote.classic.netty.tcp.port = 2552
      # akka.remote.classic.netty.tcp.bind-port = 2553
      # Network interface will be bound to the 2553 port, but remoting protocol will
      # expect messages sent to port 2552.
      #
      # akka.remote.classic.netty.tcp.port = 0
      # akka.remote.classic.netty.tcp.bind-port = 0
      # Network interface will be bound to a random port, and remoting protocol will
      # expect messages sent to the bound port.
      #
      # akka.remote.classic.netty.tcp.port = 2552
      # akka.remote.classic.netty.tcp.bind-port = 0
      # Network interface will be bound to a random port, but remoting protocol will
      # expect messages sent to port 2552.
      #
      # akka.remote.classic.netty.tcp.port = 0
      # akka.remote.classic.netty.tcp.bind-port = 2553
      # Network interface will be bound to the 2553 port, and remoting protocol will
      # expect messages sent to the bound port.
      #
      # akka.remote.classic.netty.tcp.port = 2552
      # akka.remote.classic.netty.tcp.bind-port = ""
      # Network interface will be bound to the 2552 port, and remoting protocol will
      # expect messages sent to the bound port.
      #
      # akka.remote.classic.netty.tcp.port if empty
      bind-port = ""

      # Use this setting to bind a network interface to a different hostname or ip
      # than remoting protocol expects messages at.
      # Use "0.0.0.0" to bind to all interfaces.
      # akka.remote.classic.netty.tcp.hostname if empty
      bind-hostname = ""

      # Enables SSL support on this transport
      enable-ssl = false

      # Sets the connectTimeoutMillis of all outbound connections,
      # i.e. how long a connect may take until it is timed out
      connection-timeout = 15 s

      # If set to "<id.of.dispatcher>" then the specified dispatcher
      # will be used to accept inbound connections, and perform IO. If "" then
      # dedicated threads will be used.
      # Please note that the Netty driver only uses this configuration and does
      # not read the "akka.remote.use-dispatcher" entry. Instead it has to be
      # configured manually to point to the same dispatcher if needed.
      use-dispatcher-for-io = ""

      # Sets the high water mark for the in and outbound sockets,
      # set to 0b for platform default
      write-buffer-high-water-mark = 0b

      # Sets the low water mark for the in and outbound sockets,
      # set to 0b for platform default
      write-buffer-low-water-mark = 0b

      # Sets the send buffer size of the Sockets,
      # set to 0b for platform default
      send-buffer-size = 256000b

      # Sets the receive buffer size of the Sockets,
      # set to 0b for platform default
      receive-buffer-size = 256000b

      # Maximum message size the transport will accept, but at least
      # 32000 bytes.
      # Please note that UDP does not support arbitrary large datagrams,
      # so this setting has to be chosen carefully when using UDP.
      # Both send-buffer-size and receive-buffer-size settings has to
      # be adjusted to be able to buffer messages of maximum size.
      maximum-frame-size = 128000b

      # Sets the size of the connection backlog
      backlog = 4096

      # Enables the TCP_NODELAY flag, i.e. disables Nagle’s algorithm
      tcp-nodelay = on

      # Enables TCP Keepalive, subject to the O/S kernel’s configuration
      tcp-keepalive = on

      # Enables SO_REUSEADDR, which determines when an ActorSystem can open
      # the specified listen port (the meaning differs between *nix and Windows)
      # Valid values are "on", "off" and "off-for-windows"
      # due to the following Windows bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4476378
      # "off-for-windows" of course means that it's "on" for all other platforms
      tcp-reuse-addr = off-for-windows

      # Used to configure the number of I/O worker threads on server sockets
      server-socket-worker-pool {
        # Min number of threads to cap factor-based number to
        pool-size-min = 2

        # The pool size factor is used to determine thread pool size
        # using the following formula: ceil(available processors * factor).
        # Resulting size is then bounded by the pool-size-min and
        # pool-size-max values.
        pool-size-factor = 1.0

        # Max number of threads to cap factor-based number to
        pool-size-max = 2
      }

      # Used to configure the number of I/O worker threads on client sockets
      client-socket-worker-pool {
        # Min number of threads to cap factor-based number to
        pool-size-min = 2

        # The pool size factor is used to determine thread pool size
        # using the following formula: ceil(available processors * factor).
        # Resulting size is then bounded by the pool-size-min and
        # pool-size-max values.
        pool-size-factor = 1.0

        # Max number of threads to cap factor-based number to
        pool-size-max = 2
      }


    }

    netty.ssl = ${akka.remote.classic.netty.tcp}
    netty.ssl = {
      # Enable SSL/TLS encryption.
      # This must be enabled on both the client and server to work.
      enable-ssl = true

      # Factory of SSLEngine.
      # Must implement akka.remote.transport.netty.SSLEngineProvider and have a public
      # constructor with an ActorSystem parameter.
      # The default ConfigSSLEngineProvider is configured by properties in section
      # akka.remote.classic.netty.ssl.security
      #
      # The SSLEngineProvider can also be defined via ActorSystemSetup with
      # SSLEngineProviderSetup  when starting the ActorSystem. That is useful when
      # the SSLEngineProvider implementation requires other external constructor
      # parameters or is created before the ActorSystem is created.
      # If such SSLEngineProviderSetup is defined this config property is not used.
      ssl-engine-provider = akka.remote.transport.netty.ConfigSSLEngineProvider

      security {
        # This is the Java Key Store used by the server connection
        key-store = "keystore"

        # This password is used for decrypting the key store
        key-store-password = "changeme"

        # This password is used for decrypting the key
        key-password = "changeme"

        # This is the Java Key Store used by the client connection
        trust-store = "truststore"

        # This password is used for decrypting the trust store
        trust-store-password = "changeme"

        # Protocol to use for SSL encryption, choose from:
        # TLS 1.2 is available since JDK7, and default since JDK8:
        # https://blogs.oracle.com/java-platform-group/entry/java_8_will_use_tls
        protocol = "TLSv1.2"

        # Example: ["TLS_RSA_WITH_AES_128_CBC_SHA", "TLS_RSA_WITH_AES_256_CBC_SHA"]
        # You need to install the JCE Unlimited Strength Jurisdiction Policy
        # Files to use AES 256.
        # More info here:
        enabled-algorithms = ["TLS_RSA_WITH_AES_128_CBC_SHA"]

        # There are two options, and the default SecureRandom is recommended:
        # "" or "SecureRandom" => (default)
        # "SHA1PRNG" => Can be slow because of blocking issues on Linux
        #
        # Setting a value here may require you to supply the appropriate cipher
        # suite (see enabled-algorithms section above)
        random-number-generator = ""

        # Require mutual authentication between TLS peers
        #
        # Without mutual authentication only the peer that actively establishes a connection (TLS client side)
        # checks if the passive side (TLS server side) sends over a trusted certificate. With the flag turned on,
        # the passive side will also request and verify a certificate from the connecting peer.
        #
        # To prevent man-in-the-middle attacks this setting is enabled by default.
        #
        # Note: Nodes that are configured with this setting to 'on' might not be able to receive messages from nodes that
        # run on older versions of akka-remote. This is because in versions of Akka < 2.4.12 the active side of the remoting
        # connection will not send over certificates even if asked.
        #
        # However, starting with Akka 2.4.12, even with this setting "off", the active side (TLS client side)
        # will use the given key-store to send over a certificate if asked. A rolling upgrade from versions of
        # Akka < 2.4.12 can therefore work like this:
        #   - upgrade all nodes to an Akka version >= 2.4.12, in the best case the latest version, but keep this setting at "off"
        #   - then switch this flag to "on" and do again a rolling upgrade of all nodes
        # The first step ensures that all nodes will send over a certificate when asked to. The second
        # step will ensure that all nodes finally enforce the secure checking of client certificates.
        require-mutual-authentication = on
      }
    }

    ### Default configuration for the failure injector transport adapter

    gremlin {
      # Enable debug logging of the failure injector transport adapter
      debug = off
    }

    backoff-remote-dispatcher {
      type = Dispatcher
      executor = "fork-join-executor"
      fork-join-executor {
        # Min number of threads to cap factor-based parallelism number to
        parallelism-min = 2
        parallelism-max = 2
      }
    }
  }
}

akka-testkit

######################################
# Akka Testkit Reference Config File #
######################################

# This is the reference config file that contains all the default settings.
# Make your edits/overrides in your application.conf.

akka {
  test {
    # factor by which to scale timeouts during tests, e.g. to account for shared
    # build system load
    timefactor =  1.0

    # duration of EventFilter.intercept waits after the block is finished until
    # all required messages are received
    filter-leeway = 3s

    # duration to wait in expectMsg and friends outside of within() block
    # by default, will be dilated by the timefactor.
    single-expect-default = 3s

    # duration to wait in expectNoMessage by default,
    # will be dilated by the timefactor.
    expect-no-message-default = 100ms

    # The timeout that is added as an implicit by DefaultTimeout trait
    default-timeout = 5s

    calling-thread-dispatcher {
      type = akka.testkit.CallingThreadDispatcherConfigurator
    }
  }

  actor {

    serializers {
      java-test = "akka.testkit.TestJavaSerializer"
    }

    serialization-identifiers {
      "akka.testkit.TestJavaSerializer" = 23
    }

    serialization-bindings {
      "akka.testkit.JavaSerializable" = java-test
    }
  }
}

akka-cluster-metrics

##############################################
# Akka Cluster Metrics Reference Config File #
##############################################

# This is the reference config file that contains all the default settings.
# Make your edits in your application.conf in order to override these settings.

# Sigar provisioning:
#
#  User can provision sigar classes and native library in one of the following ways:
# 
#  1) Use https://github.com/kamon-io/sigar-loader Kamon sigar-loader as a project dependency for the user project.
#  Metrics extension will extract and load sigar library on demand with help of Kamon sigar provisioner.
# 
#  2) Use https://github.com/kamon-io/sigar-loader Kamon sigar-loader as java agent: `java -javaagent:/path/to/sigar-loader.jar`
#  Kamon sigar loader agent will extract and load sigar library during JVM start.
# 
#  3) Place `sigar.jar` on the `classpath` and sigar native library for the o/s on the `java.library.path`
#  User is required to manage both project dependency and library deployment manually.

# Cluster metrics extension.
# Provides periodic statistics collection and publication throughout the cluster.
akka.cluster.metrics {
  # Full path of dispatcher configuration key.
  dispatcher = "akka.actor.default-dispatcher"
  # How long should any actor wait before starting the periodic tasks.
  periodic-tasks-initial-delay = 1s
  # Sigar native library extract location.
  # Use per-application-instance scoped location, such as program working directory.
  native-library-extract-folder = ${user.dir}"/native"
  # Metrics supervisor actor.
  supervisor {
    # Actor name. Example name space: /system/cluster-metrics
    name = "cluster-metrics"
    # Supervision strategy.
    strategy {
      #
      # FQCN of class providing `akka.actor.SupervisorStrategy`.
      # Must have a constructor with signature `<init>(com.typesafe.config.Config)`.
      # Default metrics strategy provider is a configurable extension of `OneForOneStrategy`.
      provider = "akka.cluster.metrics.ClusterMetricsStrategy"
      #
      # Configuration of the default strategy provider.
      # Replace with custom settings when overriding the provider.
      configuration = {
        # Log restart attempts.
        loggingEnabled = true
        # Child actor restart-on-failure window.
        withinTimeRange = 3s
        # Maximum number of restart attempts before child actor is stopped.
        maxNrOfRetries = 3
      }
    }
  }
  # Metrics collector actor.
  collector {
    # Enable or disable metrics collector for load-balancing nodes.
    # Metrics collection can also be controlled at runtime by sending control messages
    # to /system/cluster-metrics actor: `akka.cluster.metrics.{CollectionStartMessage,CollectionStopMessage}`
    enabled = on
    # FQCN of the metrics collector implementation.
    # It must implement `akka.cluster.metrics.MetricsCollector` and
    # have public constructor with akka.actor.ActorSystem parameter.
    # Will try to load in the following order of priority:
    # 1) configured custom collector 2) internal `SigarMetricsCollector` 3) internal `JmxMetricsCollector`
    provider = ""
    # Try all 3 available collector providers, or else fail on the configured custom collector provider.
    fallback = true
    # How often metrics are sampled on a node.
    # Shorter interval will collect the metrics more often.
    # Also controls frequency of the metrics publication to the node system event bus.
    sample-interval = 3s
    # How often a node publishes metrics information to the other nodes in the cluster.
    # Shorter interval will publish the metrics gossip more often.
    gossip-interval = 3s
    # How quickly the exponential weighting of past data is decayed compared to
    # new data. Set lower to increase the bias toward newer values.
    # The relevance of each data sample is halved for every passing half-life
    # duration, i.e. after 4 times the half-life, a data sample’s relevance is
    # reduced to 6% of its original relevance. The initial relevance of a data
    # sample is given by 1 – 0.5 ^ (collect-interval / half-life).
    # See http://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average
    moving-average-half-life = 12s
  }
}

# Cluster metrics extension serializers and routers.
akka.actor {
  # Protobuf serializer for remote cluster metrics messages.
  serializers {
    akka-cluster-metrics = "akka.cluster.metrics.protobuf.MessageSerializer"
  }
  # Interface binding for remote cluster metrics messages.
  serialization-bindings {
    "akka.cluster.metrics.ClusterMetricsMessage" = akka-cluster-metrics
    "akka.cluster.metrics.AdaptiveLoadBalancingPool" = akka-cluster-metrics
    "akka.cluster.metrics.MixMetricsSelector" = akka-cluster-metrics
    "akka.cluster.metrics.CpuMetricsSelector$" = akka-cluster-metrics
    "akka.cluster.metrics.HeapMetricsSelector$" = akka-cluster-metrics
    "akka.cluster.metrics.SystemLoadAverageMetricsSelector$" = akka-cluster-metrics
  }
  # Globally unique metrics extension serializer identifier.
  serialization-identifiers {
    "akka.cluster.metrics.protobuf.MessageSerializer" = 10
  }
  #  Provide routing of messages based on cluster metrics.
  router.type-mapping {
    cluster-metrics-adaptive-pool  = "akka.cluster.metrics.AdaptiveLoadBalancingPool"
    cluster-metrics-adaptive-group = "akka.cluster.metrics.AdaptiveLoadBalancingGroup"
  }
}

akka-cluster-tools

############################################
# Akka Cluster Tools Reference Config File #
############################################

# This is the reference config file that contains all the default settings.
# Make your edits/overrides in your application.conf.

# //#pub-sub-ext-config
# Settings for the DistributedPubSub extension
akka.cluster.pub-sub {
  # Actor name of the mediator actor, /system/distributedPubSubMediator
  name = distributedPubSubMediator

  # Start the mediator on members tagged with this role.
  # All members are used if undefined or empty.
  role = ""

  # The routing logic to use for 'Send'
  # Possible values: random, round-robin, broadcast
  routing-logic = random

  # How often the DistributedPubSubMediator should send out gossip information
  gossip-interval = 1s

  # Removed entries are pruned after this duration
  removed-time-to-live = 120s

  # Maximum number of elements to transfer in one message when synchronizing the registries.
  # Next chunk will be transferred in next round of gossip.
  max-delta-elements = 3000

  # When a message is published to a topic with no subscribers send it to the dead letters.
  send-to-dead-letters-when-no-subscribers = on
  
  # The id of the dispatcher to use for DistributedPubSubMediator actors. 
  # If specified you need to define the settings of the actual dispatcher.
  use-dispatcher = "akka.actor.internal-dispatcher"
}
# //#pub-sub-ext-config

# Protobuf serializer for cluster DistributedPubSubMeditor messages
akka.actor {
  serializers {
    akka-pubsub = "akka.cluster.pubsub.protobuf.DistributedPubSubMessageSerializer"
  }
  serialization-bindings {
    "akka.cluster.pubsub.DistributedPubSubMessage" = akka-pubsub
    "akka.cluster.pubsub.DistributedPubSubMediator$Internal$SendToOneSubscriber" = akka-pubsub
  }
  serialization-identifiers {
    "akka.cluster.pubsub.protobuf.DistributedPubSubMessageSerializer" = 9
  }
}


# //#receptionist-ext-config
# Settings for the ClusterClientReceptionist extension
akka.cluster.client.receptionist {
  # Actor name of the ClusterReceptionist actor, /system/receptionist
  name = receptionist

  # Start the receptionist on members tagged with this role.
  # All members are used if undefined or empty.
  role = ""

  # The receptionist will send this number of contact points to the client
  number-of-contacts = 3

  # The actor that tunnel response messages to the client will be stopped
  # after this time of inactivity.
  response-tunnel-receive-timeout = 30s
  
  # The id of the dispatcher to use for ClusterReceptionist actors.
  # If specified you need to define the settings of the actual dispatcher.
  use-dispatcher = "akka.actor.internal-dispatcher"

  # How often failure detection heartbeat messages should be received for
  # each ClusterClient
  heartbeat-interval = 2s

  # Number of potentially lost/delayed heartbeats that will be
  # accepted before considering it to be an anomaly.
  # The ClusterReceptionist is using the akka.remote.DeadlineFailureDetector, which
  # will trigger if there are no heartbeats within the duration
  # heartbeat-interval + acceptable-heartbeat-pause, i.e. 15 seconds with
  # the default settings.
  acceptable-heartbeat-pause = 13s

  # Failure detection checking interval for checking all ClusterClients
  failure-detection-interval = 2s
}
# //#receptionist-ext-config

# //#cluster-client-config
# Settings for the ClusterClient
akka.cluster.client {
  # Actor paths of the ClusterReceptionist actors on the servers (cluster nodes)
  # that the client will try to contact initially. It is mandatory to specify
  # at least one initial contact. 
  # Comma separated full actor paths defined by a string on the form of
  # "akka://[email protected]:port/system/receptionist"
  initial-contacts = []
  
  # Interval at which the client retries to establish contact with one of 
  # ClusterReceptionist on the servers (cluster nodes)
  establishing-get-contacts-interval = 3s
  
  # Interval at which the client will ask the ClusterReceptionist for
  # new contact points to be used for next reconnect.
  refresh-contacts-interval = 60s
  
  # How often failure detection heartbeat messages should be sent
  heartbeat-interval = 2s
  
  # Number of potentially lost/delayed heartbeats that will be
  # accepted before considering it to be an anomaly.
  # The ClusterClient is using the akka.remote.DeadlineFailureDetector, which
  # will trigger if there are no heartbeats within the duration 
  # heartbeat-interval + acceptable-heartbeat-pause, i.e. 15 seconds with
  # the default settings.
  acceptable-heartbeat-pause = 13s
  
  # If connection to the receptionist is not established the client will buffer
  # this number of messages and deliver them the connection is established.
  # When the buffer is full old messages will be dropped when new messages are sent
  # via the client. Use 0 to disable buffering, i.e. messages will be dropped
  # immediately if the location of the singleton is unknown.
  # Maximum allowed buffer size is 10000.
  buffer-size = 1000

  # If connection to the receiptionist is lost and the client has not been
  # able to acquire a new connection for this long the client will stop itself.
  # This duration makes it possible to watch the cluster client and react on a more permanent
  # loss of connection with the cluster, for example by accessing some kind of
  # service registry for an updated set of initial contacts to start a new cluster client with.
  # If this is not wanted it can be set to "off" to disable the timeout and retry
  # forever.
  reconnect-timeout = off
}
# //#cluster-client-config

# Protobuf serializer for ClusterClient messages
akka.actor {
  serializers {
    akka-cluster-client = "akka.cluster.client.protobuf.ClusterClientMessageSerializer"
  }
  serialization-bindings {
    "akka.cluster.client.ClusterClientMessage" = akka-cluster-client
  }
  serialization-identifiers {
    "akka.cluster.client.protobuf.ClusterClientMessageSerializer" = 15
  }
}

# //#singleton-config
akka.cluster.singleton {
  # The actor name of the child singleton actor.
  singleton-name = "singleton"
  
  # Singleton among the nodes tagged with specified role.
  # If the role is not specified it's a singleton among all nodes in the cluster.
  role = ""
  
  # When a node is becoming oldest it sends hand-over request to previous oldest, 
  # that might be leaving the cluster. This is retried with this interval until 
  # the previous oldest confirms that the hand over has started or the previous 
  # oldest member is removed from the cluster (+ akka.cluster.down-removal-margin).
  hand-over-retry-interval = 1s
  
  # The number of retries are derived from hand-over-retry-interval and
  # akka.cluster.down-removal-margin (or ClusterSingletonManagerSettings.removalMargin),
  # but it will never be less than this property.
  # After the hand over retries and it's still not able to exchange the hand over messages
  # with the previous oldest it will restart itself by throwing ClusterSingletonManagerIsStuck,
  # to start from a clean state. After that it will still not start the singleton instance
  # until the previous oldest node has been removed from the cluster.
  # On the other side, on the previous oldest node, the same number of retries - 3 are used
  # and after that the singleton instance is stopped.
  # For large clusters it might be necessary to increase this to avoid too early timeouts while
  # gossip dissemination of the Leaving to Exiting phase occurs. For normal leaving scenarios
  # it will not be a quicker hand over by reducing this value, but in extreme failure scenarios
  # the recovery might be faster.
  min-number-of-hand-over-retries = 15

  # Config path of the lease to be taken before creating the singleton actor
  # if the lease is lost then the actor is restarted and it will need to re-acquire the lease
  # the default is no lease
  use-lease = ""

  # The interval between retries for acquiring the lease
  lease-retry-interval = 5s
}
# //#singleton-config

# //#singleton-proxy-config
akka.cluster.singleton-proxy {
  # The actor name of the singleton actor that is started by the ClusterSingletonManager
  singleton-name = ${akka.cluster.singleton.singleton-name}
  
  # The role of the cluster nodes where the singleton can be deployed. 
  # If the role is not specified then any node will do.
  role = ""
  
  # Interval at which the proxy will try to resolve the singleton instance.
  singleton-identification-interval = 1s
  
  # If the location of the singleton is unknown the proxy will buffer this
  # number of messages and deliver them when the singleton is identified. 
  # When the buffer is full old messages will be dropped when new messages are
  # sent via the proxy.
  # Use 0 to disable buffering, i.e. messages will be dropped immediately if
  # the location of the singleton is unknown.
  # Maximum allowed buffer size is 10000.
  buffer-size = 1000 
}
# //#singleton-proxy-config

# Serializer for cluster ClusterSingleton messages
akka.actor {
  serializers {
    akka-singleton = "akka.cluster.singleton.protobuf.ClusterSingletonMessageSerializer"
  }
  serialization-bindings {
    "akka.cluster.singleton.ClusterSingletonMessage" = akka-singleton
  }
  serialization-identifiers {
    "akka.cluster.singleton.protobuf.ClusterSingletonMessageSerializer" = 14
  }
}

akka-cluster-sharding-typed


# //#sharding-ext-config # //#number-of-shards akka.cluster.sharding { # Number of shards used by the default HashCodeMessageExtractor # when no other message extractor is defined. This value must be # the same for all nodes in the cluster and that is verified by # configuration check when joining. Changing the value requires # stopping all nodes in the cluster. number-of-shards = 1000 } # //#number-of-shards # //#sharding-ext-config akka.cluster.configuration-compatibility-check.checkers { akka-cluster-sharding-hash-extractor = "akka.cluster.sharding.typed.internal.JoinConfigCompatCheckerClusterSharding" } akka.actor { serializers { typed-sharding = "akka.cluster.sharding.typed.internal.ShardingSerializer" } serialization-identifiers { "akka.cluster.sharding.typed.internal.ShardingSerializer" = 25 } serialization-bindings { "akka.cluster.sharding.typed.ShardingEnvelope" = typed-sharding } }

akka-cluster-sharding

###############################################
# Akka Cluster Sharding Reference Config File #
###############################################

# This is the reference config file that contains all the default settings.
# Make your edits/overrides in your application.conf.


# //#sharding-ext-config
# Settings for the ClusterShardingExtension
akka.cluster.sharding {

  # The extension creates a top level actor with this name in top level system scope,
  # e.g. '/system/sharding'
  guardian-name = sharding

  # Specifies that entities runs on cluster nodes with a specific role.
  # If the role is not specified (or empty) all nodes in the cluster are used.
  role = ""

  # When this is set to 'on' the active entity actors will automatically be restarted
  # upon Shard restart. i.e. if the Shard is started on a different ShardRegion
  # due to rebalance or crash.
  remember-entities = off

  # Set this to a time duration to have sharding passivate entities when they have not
  # received any message in this length of time. Set to 'off' to disable.
  # It is always disabled if `remember-entities` is enabled.
  passivate-idle-entity-after = 120s

  # If the coordinator can't store state changes it will be stopped
  # and started again after this duration, with an exponential back-off
  # of up to 5 times this duration.
  coordinator-failure-backoff = 5 s

  # The ShardRegion retries registration and shard location requests to the
  # ShardCoordinator with this interval if it does not reply.
  retry-interval = 2 s

  # Maximum number of messages that are buffered by a ShardRegion actor.
  buffer-size = 100000

  # Timeout of the shard rebalancing process.
  # Additionally, if an entity doesn't handle the stopMessage
  # after (handoff-timeout - 5.seconds).max(1.second) it will be stopped forcefully
  handoff-timeout = 60 s

  # Time given to a region to acknowledge it's hosting a shard.
  shard-start-timeout = 10 s

  # If the shard is remembering entities and can't store state changes
  # will be stopped and then started again after this duration. Any messages
  # sent to an affected entity may be lost in this process.
  shard-failure-backoff = 10 s

  # If the shard is remembering entities and an entity stops itself without
  # using passivate. The entity will be restarted after this duration or when
  # the next message for it is received, which ever occurs first.
  entity-restart-backoff = 10 s

  # Rebalance check is performed periodically with this interval.
  rebalance-interval = 10 s

  # Absolute path to the journal plugin configuration entity that is to be
  # used for the internal persistence of ClusterSharding. If not defined
  # the default journal plugin is used. Note that this is not related to
  # persistence used by the entity actors.
  # Only used when state-store-mode=persistence
  journal-plugin-id = ""

  # Absolute path to the snapshot plugin configuration entity that is to be
  # used for the internal persistence of ClusterSharding. If not defined
  # the default snapshot plugin is used. Note that this is not related to
  # persistence used by the entity actors.
  # Only used when state-store-mode=persistence
  snapshot-plugin-id = ""

  # Defines how the coordinator stores its state. Same is also used by the
  # shards for rememberEntities.
  # Valid values are "ddata" or "persistence". 
  state-store-mode = "ddata"

  # The shard saves persistent snapshots after this number of persistent
  # events. Snapshots are used to reduce recovery times.
  # Only used when state-store-mode=persistence
  snapshot-after = 1000

  # The shard deletes persistent events (messages and snapshots) after doing snapshot
  # keeping this number of old persistent batches.
  # Batch is of size `snapshot-after`.
  # When set to 0 after snapshot is successfully done all events with equal or lower sequence number will be deleted.
  # Default value of 2 leaves last maximum 2*`snapshot-after` events and 3 snapshots (2 old ones + latest snapshot)
  keep-nr-of-batches = 2

  # Setting for the default shard allocation strategy
  least-shard-allocation-strategy {
    # Threshold of how large the difference between most and least number of
    # allocated shards must be to begin the rebalancing.
    # The difference between number of shards in the region with most shards and
    # the region with least shards must be greater than (>) the `rebalanceThreshold`
    # for the rebalance to occur.
    # It is also the maximum number of shards that will start rebalancing per rebalance-interval
    # 1 gives the best distribution and therefore typically the best choice.
    # Increasing the threshold can result in quicker rebalance but has the
    # drawback of increased difference between number of shards (and therefore load)
    # on different nodes before rebalance will occur.
    rebalance-threshold = 1

    # The number of ongoing rebalancing processes is limited to this number.
    max-simultaneous-rebalance = 3
  }

  # Timeout of waiting the initial distributed state for the shard coordinator (an initial state will be queried again if the timeout happened)
  # and for a shard to get its state when remembered entities is enabled
  # The read from ddata is a ReadMajority, for small clusters (< majority-min-cap) every node needs to respond
  # so is more likely to time out if there are nodes restarting e.g. when there is a rolling re-deploy happening
  # Only used when state-store-mode=ddata
  waiting-for-state-timeout = 2 s

  # Timeout of waiting for update the distributed state (update will be retried if the timeout happened)
  # Only used when state-store-mode=ddata
  updating-state-timeout = 5 s

  # Timeout to wait for querying all shards for a given `ShardRegion`.
  shard-region-query-timeout = 3 s

  # The shard uses this strategy to determines how to recover the underlying entity actors. The strategy is only used
  # by the persistent shard when rebalancing or restarting. The value can either be "all" or "constant". The "all"
  # strategy start all the underlying entity actors at the same time. The constant strategy will start the underlying
  # entity actors at a fix rate. The default strategy "all".
  entity-recovery-strategy = "all"

  # Default settings for the constant rate entity recovery strategy
  entity-recovery-constant-rate-strategy {
    # Sets the frequency at which a batch of entity actors is started.
    frequency = 100 ms
    # Sets the number of entity actors to be restart at a particular interval
    number-of-entities = 5
  }

  # Settings for the coordinator singleton. Same layout as akka.cluster.singleton.
  # The "role" of the singleton configuration is not used. The singleton role will
  # be the same as "akka.cluster.sharding.role".
  # A lease can be configured in these settings for the coordinator singleton
  coordinator-singleton = ${akka.cluster.singleton}
  
  # Settings for the Distributed Data replicator. 
  # Same layout as akka.cluster.distributed-data.
  # The "role" of the distributed-data configuration is not used. The distributed-data
  # role will be the same as "akka.cluster.sharding.role".
  # Note that there is one Replicator per role and it's not possible
  # to have different distributed-data settings for different sharding entity types.
  # Only used when state-store-mode=ddata
  distributed-data = ${akka.cluster.distributed-data}
  distributed-data {
    # minCap parameter to MajorityWrite and MajorityRead consistency level.
    majority-min-cap = 5
    durable.keys = ["shard-*"]
    
    # When using many entities with "remember entities" the Gossip message
    # can become to large if including to many in same message. Limit to
    # the same number as the number of ORSet per shard.
    max-delta-elements = 5
    
  }

  # The id of the dispatcher to use for ClusterSharding actors.
  # If specified you need to define the settings of the actual dispatcher.
  # This dispatcher for the entity actors is defined by the user provided
  # Props, i.e. this dispatcher is not used for the entity actors.
  use-dispatcher = "akka.actor.internal-dispatcher"

  # Config path of the lease that each shard must acquire before starting entity actors
  # default is no lease
  # A lease can also be used for the singleton coordinator by settings it in the coordinator-singleton properties
  use-lease = ""

  # The interval between retries for acquiring the lease
  lease-retry-interval = 5s
}
# //#sharding-ext-config

akka.cluster {
  configuration-compatibility-check {
    checkers {
      akka-cluster-sharding = "akka.cluster.sharding.JoinConfigCompatCheckSharding"
    }
  }
}

# Protobuf serializer for Cluster Sharding messages
akka.actor {
  serializers {
    akka-sharding = "akka.cluster.sharding.protobuf.ClusterShardingMessageSerializer"
  }
  serialization-bindings {
    "akka.cluster.sharding.ClusterShardingSerializable" = akka-sharding
  }
  serialization-identifiers {
    "akka.cluster.sharding.protobuf.ClusterShardingMessageSerializer" = 13
  }
}

akka-distributed-data

##############################################
# Akka Distributed DataReference Config File #
##############################################

# This is the reference config file that contains all the default settings.
# Make your edits/overrides in your application.conf.


#//#distributed-data
# Settings for the DistributedData extension
akka.cluster.distributed-data {
  # Actor name of the Replicator actor, /system/ddataReplicator
  name = ddataReplicator

  # Replicas are running on members tagged with this role.
  # All members are used if undefined or empty.
  role = ""

  # How often the Replicator should send out gossip information
  gossip-interval = 2 s
  
  # How often the subscribers will be notified of changes, if any
  notify-subscribers-interval = 500 ms

  # Maximum number of entries to transfer in one gossip message when synchronizing
  # the replicas. Next chunk will be transferred in next round of gossip.
  max-delta-elements = 500
  
  # The id of the dispatcher to use for Replicator actors.
  # If specified you need to define the settings of the actual dispatcher.
  use-dispatcher = "akka.actor.internal-dispatcher"

  # How often the Replicator checks for pruning of data associated with
  # removed cluster nodes. If this is set to 'off' the pruning feature will
  # be completely disabled.
  pruning-interval = 120 s
  
  # How long time it takes to spread the data to all other replica nodes.
  # This is used when initiating and completing the pruning process of data associated
  # with removed cluster nodes. The time measurement is stopped when any replica is 
  # unreachable, but it's still recommended to configure this with certain margin.
  # It should be in the magnitude of minutes even though typical dissemination time
  # is shorter (grows logarithmic with number of nodes). There is no advantage of 
  # setting this too low. Setting it to large value will delay the pruning process.
  max-pruning-dissemination = 300 s
  
  # The markers of that pruning has been performed for a removed node are kept for this
  # time and thereafter removed. If and old data entry that was never pruned is somehow
  # injected and merged with existing data after this time the value will not be correct.
  # This would be possible (although unlikely) in the case of a long network partition.
  # It should be in the magnitude of hours. For durable data it is configured by 
  # 'akka.cluster.distributed-data.durable.pruning-marker-time-to-live'.
 pruning-marker-time-to-live = 6 h
  
  # Serialized Write and Read messages are cached when they are sent to 
  # several nodes. If no further activity they are removed from the cache
  # after this duration.
  serializer-cache-time-to-live = 10s
  
  # Settings for delta-CRDT
  delta-crdt {
    # enable or disable delta-CRDT replication
    enabled = on
    
    # Some complex deltas grow in size for each update and above this
    # threshold such deltas are discarded and sent as full state instead.
    # This is number of elements or similar size hint, not size in bytes.
    max-delta-size = 50
  }
  
  durable {
    # List of keys that are durable. Prefix matching is supported by using * at the
    # end of a key.  
    keys = []
    
    # The markers of that pruning has been performed for a removed node are kept for this
    # time and thereafter removed. If and old data entry that was never pruned is
    # injected and merged with existing data after this time the value will not be correct.
    # This would be possible if replica with durable data didn't participate in the pruning
    # (e.g. it was shutdown) and later started after this time. A durable replica should not 
    # be stopped for longer time than this duration and if it is joining again after this
    # duration its data should first be manually removed (from the lmdb directory).
    # It should be in the magnitude of days. Note that there is a corresponding setting
    # for non-durable data: 'akka.cluster.distributed-data.pruning-marker-time-to-live'.
    pruning-marker-time-to-live = 10 d
    
    # Fully qualified class name of the durable store actor. It must be a subclass
    # of akka.actor.Actor and handle the protocol defined in 
    # akka.cluster.ddata.DurableStore. The class must have a constructor with 
    # com.typesafe.config.Config parameter.
    store-actor-class = akka.cluster.ddata.LmdbDurableStore
    
    use-dispatcher = akka.cluster.distributed-data.durable.pinned-store
    
    pinned-store {
      executor = thread-pool-executor
      type = PinnedDispatcher
    }
    
    # Config for the LmdbDurableStore
    lmdb {
      # Directory of LMDB file. There are two options:
      # 1. A relative or absolute path to a directory that ends with 'ddata'
      #    the full name of the directory will contain name of the ActorSystem
      #    and its remote port.
      # 2. Otherwise the path is used as is, as a relative or absolute path to
      #    a directory.
      #
      # When running in production you may want to configure this to a specific
      # path (alt 2), since the default directory contains the remote port of the
      # actor system to make the name unique. If using a dynamically assigned 
      # port (0) it will be different each time and the previously stored data 
      # will not be loaded.
      dir = "ddata"
      
      # Size in bytes of the memory mapped file.
      map-size = 100 MiB
      
      # Accumulate changes before storing improves performance with the
      # risk of losing the last writes if the JVM crashes.
      # The interval is by default set to 'off' to write each update immediately.
      # Enabling write behind by specifying a duration, e.g. 200ms, is especially 
      # efficient when performing many writes to the same key, because it is only 
      # the last value for each key that will be serialized and stored.  
      # write-behind-interval = 200 ms
      write-behind-interval = off
    }
  }
  
}
#//#distributed-data

# Protobuf serializer for cluster DistributedData messages
akka.actor {
  serializers {
    akka-data-replication = "akka.cluster.ddata.protobuf.ReplicatorMessageSerializer"
    akka-replicated-data = "akka.cluster.ddata.protobuf.ReplicatedDataSerializer"
  }
  serialization-bindings {
    "akka.cluster.ddata.Replicator$ReplicatorMessage" = akka-data-replication
    "akka.cluster.ddata.ReplicatedDataSerialization" = akka-replicated-data
  }
  serialization-identifiers {
    "akka.cluster.ddata.protobuf.ReplicatedDataSerializer" = 11
    "akka.cluster.ddata.protobuf.ReplicatorMessageSerializer" = 12
  }
}

akka-stream

#####################################
# Akka Stream Reference Config File #
#####################################

# eager creation of the system wide materializer
akka.library-extensions += "akka.stream.SystemMaterializer"
akka {
  stream {

    # Default materializer settings
    materializer {

      # Initial size of buffers used in stream elements
      initial-input-buffer-size = 4
      # Maximum size of buffers used in stream elements
      max-input-buffer-size = 16

      # Fully qualified config path which holds the dispatcher configuration
      # or full dispatcher configuration to be used by ActorMaterializer when creating Actors.
      dispatcher = "akka.actor.default-dispatcher"

      # Fully qualified config path which holds the dispatcher configuration
      # or full dispatcher configuration to be used by stream operators that
      # perform blocking operations
      blocking-io-dispatcher = "akka.actor.default-blocking-io-dispatcher"

      # Cleanup leaked publishers and subscribers when they are not used within a given
      # deadline
      subscription-timeout {
        # when the subscription timeout is reached one of the following strategies on
        # the "stale" publisher:
        # cancel - cancel it (via `onError` or subscribing to the publisher and
        #          `cancel()`ing the subscription right away
        # warn   - log a warning statement about the stale element (then drop the
        #          reference to it)
        # noop   - do nothing (not recommended)
        mode = cancel

        # time after which a subscriber / publisher is considered stale and eligible
        # for cancelation (see `akka.stream.subscription-timeout.mode`)
        timeout = 5s
      }

      # Enable additional troubleshooting logging at DEBUG log level
      debug-logging = off

      # Maximum number of elements emitted in batch if downstream signals large demand
      output-burst-limit = 1000

      # Enable automatic fusing of all graphs that are run. For short-lived streams
      # this may cause an initial runtime overhead, but most of the time fusing is
      # desirable since it reduces the number of Actors that are created.
      # Deprecated, since Akka 2.5.0, setting does not have any effect.
      auto-fusing = on

      # Those stream elements which have explicit buffers (like mapAsync, mapAsyncUnordered,
      # buffer, flatMapMerge, Source.actorRef, Source.queue, etc.) will preallocate a fixed
      # buffer upon stream materialization if the requested buffer size is less than this
      # configuration parameter. The default is very high because failing early is better
      # than failing under load.
      #
      # Buffers sized larger than this will dynamically grow/shrink and consume more memory
      # per element than the fixed size buffers.
      max-fixed-buffer-size = 1000000000

      # Maximum number of sync messages that actor can process for stream to substream communication.
      # Parameter allows to interrupt synchronous processing to get upstream/downstream messages.
      # Allows to accelerate message processing that happening within same actor but keep system responsive.
      sync-processing-limit = 1000

      debug {
        # Enables the fuzzing mode which increases the chance of race conditions
        # by aggressively reordering events and making certain operations more
        # concurrent than usual.
        # This setting is for testing purposes, NEVER enable this in a production
        # environment!
        # To get the best results, try combining this setting with a throughput
        # of 1 on the corresponding dispatchers.
        fuzzing-mode = off
      }

      io.tcp {
        # The outgoing bytes are accumulated in a buffer while waiting for acknoledgment
        # of pending write. This improves throughput for small messages (frames) without
        # sacrificing latency. While waiting for the ack the stage will eagerly pull
        # from upstream until the buffer exceeds this size. That means that the buffer may hold
        # slightly more bytes than this limit (at most one element more). It can be set to 0
        # to disable the usage of the buffer.
        write-buffer-size = 16 KiB
      }

      # Time to wait for async materializer creation before throwing an exception
      creation-timeout = 20 seconds

      //#stream-ref
      # configure defaults for SourceRef and SinkRef
      stream-ref {
        # Buffer of a SinkRef that is used to batch Request elements from the other side of the stream ref
        #
        # The buffer will be attempted to be filled eagerly even while the local stage did not request elements,
        # because the delay of requesting over network boundaries is much higher.
        buffer-capacity = 32

        # Demand is signalled by sending a cumulative demand message ("requesting messages until the n-th sequence number)
        # Using a cumulative demand model allows us to re-deliver the demand message in case of message loss (which should
        # be very rare in any case, yet possible -- mostly under connection break-down and re-establishment).
        #
        # The semantics of handling and updating the demand however are in-line with what Reactive Streams dictates.
        #
        # In normal operation, demand is signalled in response to arriving elements, however if no new elements arrive
        # within `demand-redelivery-interval` a re-delivery of the demand will be triggered, assuming that it may have gotten lost.
        demand-redelivery-interval = 1 second

        # Subscription timeout, during which the "remote side" MUST subscribe (materialize) the handed out stream ref.
        # This timeout does not have to be very low in normal situations, since the remote side may also need to
        # prepare things before it is ready to materialize the reference. However the timeout is needed to avoid leaking
        # in-active streams which are never subscribed to.
        subscription-timeout = 30 seconds

        # In order to guard the receiving end of a stream ref from never terminating (since awaiting a Completion or Failed
        # message) after / before a Terminated is seen, a special timeout is applied once Terminated is received by it.
        # This allows us to terminate stream refs that have been targeted to other nodes which are Downed, and as such the
        # other side of the stream ref would never send the "final" terminal message.
        #
        # The timeout specifically means the time between the Terminated signal being received and when the local SourceRef
        # determines to fail itself, assuming there was message loss or a complete partition of the completion signal.
        final-termination-signal-deadline = 2 seconds
      }
      //#stream-ref
    }

    # Deprecated, left here to not break Akka HTTP which refers to it
    blocking-io-dispatcher = "akka.actor.default-blocking-io-dispatcher"

    # Deprecated, will not be used unless user code refer to it, use 'akka.stream.materializer.blocking-io-dispatcher'
    # instead, or if from code, prefer the 'ActorAttributes.IODispatcher' attribute
    default-blocking-io-dispatcher = "akka.actor.default-blocking-io-dispatcher"
  }

  # configure overrides to ssl-configuration here (to be used by akka-streams, and akka-http – i.e. when serving https connections)
  ssl-config {
    protocol = "TLSv1.2"
  }

  actor {

    serializers {
      akka-stream-ref = "akka.stream.serialization.StreamRefSerializer"
    }

    serialization-bindings {
      "akka.stream.SinkRef"                           = akka-stream-ref
      "akka.stream.SourceRef"                         = akka-stream-ref
      "akka.stream.impl.streamref.StreamRefsProtocol" = akka-stream-ref
    }

    serialization-identifiers {
      "akka.stream.serialization.StreamRefSerializer" = 30
    }
  }
}

# ssl configuration
# folded in from former ssl-config-akka module
ssl-config {
  logger = "com.typesafe.sslconfig.akka.util.AkkaLoggerBridge"
}

akka-stream-testkit

akka.stream.testkit {
  all-stages-stopped-timeout = 5 s
}
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