Post on 16-Feb-2017
Akka 2.4.x and
Commercial Features1 September 2015
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Konrad `ktoso` Malawski
Akka Team,Reactive Streams TCK
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Reactive Platform: Akka
• Reactive Platform: Versioning explained• Remoting / Cluster: Docker networking support• Cluster: Split Brain Resolver (beta)• Akka Persistence: Cross-Scala-version snapshot deserializer• Java 6: Extended LTS
• Akka 2.4.x (currently in Release Candidate phase)• Cluster Tools promoted to stable!• Persistence promoted to stable!• Persistence Queries (experimental)• Akka Typed (experimental)• Distributed Data (experimental)• Akka Streams (currently 1.0, will be included in 2.4.x eventually)
• Q / AAkka 2.4 and RP commercial features
with Konrad `@ktosopl` Malawski
Reactive Platform
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Reactive Platform
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
https://together.typesafe.com/products/reactivePlatform
Reactive Platform Versioning
15v05p01
year
month
patch=
Scala 2.10.xAkka 2.3.x …
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
https://together.typesafe.com/products/reactivePlatform
Reactive Platform Versioning
https://together.typesafe.com/products/reactivePlatform
15v05p01
year
month
patch=
Scala 2.10.xAkka 2.3.x …
15v09p01 =
Scala 2.11.xAkka 2.3.12 => 2.3.++ (binary compatible!) …
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Reactive Platform Versioning
https://together.typesafe.com/products/reactivePlatform
How does this help?• Huge integration test suite before release• Certified to work well together• Priority updates / additional features• Back-ports, fixes, long-term support
Life cycle of each release: 2 years
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
NAT Support
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
support(NAT support)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
support(NAT support)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Available in: RP 15v01p## (Akka 2.3.x), OSS only in Akka 2.4.x (work in progress)
Docker / NAT support
docker run -d -p 8000:2551 akka-app
Akka App
172.17.0.11:2551
Outside world
example.com:8000
doc.akka.io/docs/akka/2.4.0-RC1/general/remoting.html#Peer-to-Peer_vs__Client-Server
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Docker / NAT support
akka.remote { netty.tcp { hostname = example.com # external (logical) hostname port = 8000 # external (logical) port
bind-hostname = 172.17.0.11 # internal (bind) hostname bind-port = 2552 # internal (bind) port }}
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
doc.akka.io/docs/akka/2.4.0-RC1/general/remoting.html#Peer-to-Peer_vs__Client-Server
Split Brain Resolver
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Split Brain Resolver (customer beta)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Installing the Reactive Platform with Split Brain Resolver
Split Brain Resolver
• Fundamental Problem in all distributed systems• SBR helps to make decisions, is not a magic wand
• A set of pre-built strategies for when to down nodes in a cluster.
• Strategies:• Static Quorum (like zoo-keeper)• Keep Majority• Keep Oldest• Keep Referee
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
http://doc.akka.io/docs/akka/rp-15v09p01/scala/split-brain-resolver.html
Split Brain Resolver
• The default behaviour of Akka Cluster is “Manual Downing”:• A node needs to issue cluster.down(address)• This decision can be powered by external
monitoring,or DevOps teams observing the cluster.
• It is Safe.however involves the most human/automated work
• A naive implementation exists called “auto-downing”• It is not very safe to be used in real clusters• Definitely not a good choice for apps using
Persistence• It is not recommended for production deployments.Akka 2.4 and RP commercial features
with Konrad `@ktosopl` Malawski
http://doc.akka.io/docs/akka/rp-15v09p01/scala/split-brain-resolver.html
Heartbeats
A
heartbeats
heartbeats
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Heartbeats
A
heartbeats
heartbeats
everyone is down!
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Heartbeats
A
`n-1` is down!I’ll take over `A`!
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Heartbeats
A
`n-1` is down!I’ll take over `A`!
A
good if: n-1 really is down.bad: if n-1 is just very unresponsive
Fundamentally, it is hard to distinguish the two states in distributed systems.
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Static Quorum (3 (> (n/2 +1))
A
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Static Quorum (3 (> (n/2 +1))
we need to down ourselves
A
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Keep Majority (aka. dynamic quorum)
A
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Keep Majority (aka. dynamic quorum)
A
we need to down ourselves
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
referee node
Keep Referee
A
down-all-if-less-than-nodes
referee node
Keep Referee
A
can’t see referee node!
down-all-if-less-than-nodes
oldest node
Keep Oldest
A
can’t see oldest node!
down-if-alone
oldest node can change,if “up until now oldest node” leaves the
cluster.This is more dynamic than keep-
referee.
PersistenceCross-scala-versioncompatibility for snapshots
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Persistence: Cross-scala-version compat
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Enhanced compatibility for persistent snapshot envelope.(Payload compatibility depends on application.)
Persistence: Cross-scala-version compat
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Enhanced compatibility for persistent snapshot envelope.(Payload compatibility depends on application.)
• Scala 2.10 is not binary compatible with 2.11• 10 => 11 is “major update” by design
Persistence: Cross-scala-version compat
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Enhanced compatibility for persistent snapshot envelope.(Payload compatibility depends on application.)
• More compatible deserialisation than the language itself!
• Eases migration to latest Scala versions
• (Your journal may actually not be affected and be compatible anyway.)
• Scala 2.10 is not binary compatible with 2.11• 10 => 11 is “major update” by design
Persistence: Cross-scala-version compat
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
saveSnapshot( )
Akka 2.3 + Scala 2.10
Persistence: Cross-scala-version compat
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
saveSnapshot( )
Akka 2.3 + Scala 2.10
Akka 2.3 + Scala 2.11
loadSnapshotsmart serializer
Java 6 Extended LTS
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Java 6: Extended LTS
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
• Existing RP releases keep Java 1.6 compatibility
Java 6: Extended LTS
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
• Existing RP releases keep Java 1.6 compatibility
• Akka Streams & Http currently work with 1.6• will be merged into Akka 2.4 (likely after 1.1)• we can back-port and support for RP (Akka 2.3)
Java 6: Extended LTS
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
• Existing RP releases keep Java 1.6 compatibility
• Akka Streams & Http currently work with 1.6• will be merged into Akka 2.4 (likely after 1.1)• we can back-port and support for RP (Akka 2.3)
• Akka 2.4 does require Java 8• Scala 2.11 + Scala 2.12 (once released)• it will enter RP once released
Akka 2.4
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
• 2.3 => 2.4 is a major update• additional effort made it binary compatible!• it does require Java 1.8
• i.e. update your JDK, same sources “just work”
• Future:• Version bump to 3.0 if binary incompatible
Cluster Tools
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Now Stable!
Akka 2.4 Cluster Tools (Now Stable!)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
• Distributed Pub Sub• Smart message batching (1 send per node)
• Cluster Singleton• useful for “master” or coordinator Actors
• Cluster Sharding• useful for sharding load onto the cluster• graceful shut-down• balancing load across cluster
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
doc.akka.io/docs/akka/2.4.0-RC1/scala/distributed-pub-sub.html
class Subscriber extends Actor with ActorLogging {
import DistributedPubSubMediator.{ Subscribe, SubscribeAck } val mediator = DistributedPubSub(context.system).mediator // subscribe to the topic named "content" mediator ! Subscribe("content", self) def receive = { case SubscribeAck(Subscribe("content", None, `self`)) ⇒ context become ready } def ready: Actor.Receive = { case s: String ⇒ log.info("Got {}", s) }}
Akka 2.4 Cluster Tools - PubSub (Now Stable!)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
class Publisher extends Actor { import DistributedPubSubMediator.Publish // activate the extension val mediator = DistributedPubSub(context.system).mediator def receive = { case in: String ⇒ val out = in.toUpperCase mediator ! Publish("content", out) }}
doc.akka.io/docs/akka/2.4.0-RC1/scala/distributed-pub-sub.html
Akka 2.4 Cluster Tools - PubSub (Now Stable!)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
AB
C D
http://doc.akka.io/docs/akka/2.4.0-RC1/scala/cluster-singleton.html
Akka 2.4 Cluster Tools - Cluster Singleton (Now Stable!)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
A
B
C
D
role: backend-2 role: backend-2
http://doc.akka.io/docs/akka/2.4.0-RC1/scala/cluster-singleton.html
Akka 2.4 Cluster Tools - Cluster Singleton (Now Stable!)
Akka 2.4 Cluster Tools - Sharding (Now Stable!)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
A B
C D
doc.akka.io/docs/akka/2.4.0-RC1/scala/cluster-sharding.html
Akka 2.4 Cluster Tools - Sharding (Now Stable!)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
val counterRegion: ActorRef = ClusterSharding(system).start( typeName = "Counter", entityProps = Props[Counter], settings = ClusterShardingSettings(system), extractEntityId = extractEntityId, extractShardId = extractShardId)
val counterRegion: ActorRef = ClusterSharding(system).shardRegion("Counter")counterRegion ! Get(123)expectMsg(0)
Start a shard region:
Other nodes in cluster send messages to it:
doc.akka.io/docs/akka/2.4.0-RC1/scala/cluster-sharding.html
Persistence
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Now Stable!
var state = S0
persistenceId = “a”
Command
Journal
Akka 2.4 Persistence (Now Stable!)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
var state = S0
persistenceId = “a”
Journal
Generate Events
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
var state = S0
persistenceId = “a”
Journal
Generate Events
E1
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
ACK “persisted”
Journal
E1
var state = S0
persistenceId = “a”
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
“Apply” event
Journal
E1
var state = S0
persistenceId = “a”
E1
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
Journal
E1
var state = S0
persistenceId = “a”
E1Okey!
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
Journal
E1
var state = S0
persistenceId = “a”
E1Okey!
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
Journal
E1
var state = S0
persistenceId = “a”
E1
Ok, he got my $.
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
…sum of states…
Journal
E1 E2 E3 E4
E5 E6 E7 E8
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
Snapshot Store
snapshot!
state until [E5]
S5Journal
E1 E2 E3 E4
E5 E6 E7 E8
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
Snapshot Store
state until [E8]
S8Journal
E1 E2 E3 E4
E5 E6 E7 E8
S5
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
state until [E8]
S8
Snapshot Store
Journal
E1 E2 E3 E4
E5 E6 E7 E8
crash!
S5
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
Snapshot Store
Journal
E1 E2 E3 E4
E5 E6 E7 E8
crash!
S5
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
“bring me up-to-date!”
Snapshot Store
Journal
E1 E2 E3 E4
E5 E6 E7 E8
restart!
replay!
S5
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
“bring me up-to-date!”
Snapshot Store
restart!
replay!
S5Journal
E1 E2 E3 E4
E5 E6 E7 E8
S5
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
state until [E8]
Snapshot Store
S5
restart!
replay!
S8Journal
E1 E2 E3 E4
E5 E6 E7 E8
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka 2.4 Persistence (Now Stable!)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Advanced support for long-term schema evolution.
EventAdapters & StringManifestSerializers
Akka 2.4 Persistence (Now Stable!)
Persistence Query
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
New module, experimental!
Akka 2.4 Persistence Queries (experimental)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
API still work in progress, should be polished very soon.
val query: Source[RichEvent, QueryStats] = readJournal.query(ByTagsWithStats(Set("red", "blue")))
query .map { event => s"Event payload: ${event.payload}" } .runWith(Sink.ignore)
Akka 2.4 Persistence Queries (experimental)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
API still work in progress, should be polished very soon.
val query: Source[RichEvent, QueryStats] = readJournal.query(ByTagsWithStats(Set("red", "blue")))
query .map { event => s"Event payload: ${event.payload}" } .runWith(Sink.ignore)
Journalwrite-side
query-side
QueryOptimised
Journal
query-side
Simple view / result
Akka Typed
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
New module, experimental!
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom) }
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor
Akka 2.4 Typed (experimental)
Akka 2.4 Typed (experimental)
val greeter = Total[Greet] { msg ⇒
println(s"Hello ${msg.whom}!") msg.replyTo ! Greeted(msg.whom)
Same}
val system: ActorSystem[Greet] = ActorSystem(“typed", Props(totalGreeter))
system ! Greet("kapi", system.deadLetters)
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom) }
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor Akka Typed
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
val greeter = Total[Greet] { msg ⇒
println(s"Hello ${msg.whom}!") msg.replyTo ! Greeted(msg.whom)
Same}
val system: ActorSystem[Greet] = ActorSystem(“typed", Props(totalGreeter))
system ! Greet("kapi", system.deadLetters)
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom) }
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor Akka Typed
The main concept is Behaviour[T]Explicit protocols for the win!
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
Akka 2.4 Typed (experimental)
val greeter = Total[Greet] { msg ⇒
println(s"Hello ${msg.whom}!") msg.replyTo ! Greeted(msg.whom)
Same}
val system: ActorSystem[Greet] = ActorSystem(“typed", Props(totalGreeter))
system ! Greet("kapi", system.deadLetters)
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom) }
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor Akka Typed
Since Behaviour[Greet] is typed,
msg is-a Greet.
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
Akka 2.4 Typed (experimental)
val greeter = Total[Greet] { msg ⇒
println(s"Hello ${msg.whom}!") msg.replyTo ! Greeted(msg.whom)
Same}
val system: ActorSystem[Greet] = ActorSystem(“typed", Props(totalGreeter))
system ! Greet("kapi", system.deadLetters)
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom) }
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor Akka Typed
The Behaviour[T]is the receive.
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
Akka 2.4 Typed (experimental)
val greeter = Total[Greet] { msg ⇒
println(s"Hello ${msg.whom}!") msg.replyTo ! Greeted(msg.whom)
Same}
val system: ActorSystem[Greet] = ActorSystem(“typed", Props(totalGreeter))
system ! Greet("kapi", system.deadLetters)
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom) }
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor Akka Typed
sender() is no more.Explicit protocols for the win!
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
Akka 2.4 Typed (experimental)
val greeter = Total[Greet] { msg ⇒
println(s"Hello ${msg.whom}!") msg.replyTo ! Greeted(msg.whom)
Same}
val system: ActorSystem[Greet] = ActorSystem(“typed", Props(totalGreeter))
system ! Greet("kapi", system.deadLetters)
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom) }
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor Akka Typed
sender() is no more.Explicit protocols for the win!
final case class Greet(whom: String, replyTo: ActorRef[Greeted])
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
Akka 2.4 Typed (experimental)
val greeter = Total[Greet] { msg ⇒
println(s"Hello ${msg.whom}!") msg.replyTo ! Greeted(msg.whom)
Same}
val system: ActorSystem[Greet] = ActorSystem(“typed", Props(totalGreeter))
system ! Greet("kapi", system.deadLetters)
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom) }
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor Akka Typed
ActorRef[T] is now typed!
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
Akka 2.4 Typed (experimental)
val greeter = Total[Greet] { msg ⇒
println(s"Hello ${msg.whom}!") msg.replyTo ! Greeted(msg.whom)
Same}
val system: ActorSystem[Greet] = ActorSystem(“typed", Props(totalGreeter))
system ! Greet("kapi", system.deadLetters)
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom)
}
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor Akka Typed
become()is required.
And replaced by returning the “next” Behaviour[T]
// context.become(receive)
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
Akka 2.4 Typed (experimental)
val greeter = Total[Greet] { msg ⇒
println(s"Hello ${msg.whom}!") msg.replyTo ! Greeted(msg.whom)
Same}
val system: ActorSystem[Greet] = ActorSystem(“typed", Props(totalGreeter))
system ! Greet("kapi", system.deadLetters)
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom)
}
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor Akka Typed
become()is required.
And replaced by returning the “next” Behaviour[T]On a conceptual level at least,
we provide Static[T]if you don’t need become.
// context.become(receive)
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
Akka 2.4 Typed (experimental)
val greeter = Total[Greet] { msg ⇒
println(s"Hello ${msg.whom}!") msg.replyTo ! Greeted(msg.whom)
Same}
val system: ActorSystem[Greet] = ActorSystem(“typed", Props(totalGreeter))
system ! Greet("kapi", system.deadLetters)
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom)
}
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor Akka Typed
become()is required.
And replaced by returning the “next” Behaviour[T]Special behaviors:
Same / Unhandled / Empty / Stopped / Ignore
// context.become(receive)
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
Akka 2.4 Typed (experimental)
val greeter = Total[Greet] { msg ⇒
println(s"Hello ${msg.whom}!") msg.replyTo ! Greeted(msg.whom)
Same}
val system: ActorSystem[Greet] = ActorSystem(“typed", Props(totalGreeter))
system ! Greet("kapi", system.deadLetters)
class Greeter extends Actor {
def receive = { case msg: Greet ⇒ println(s"Hello ${msg.whom}!") sender() ! Greeted(msg.whom) }
}
val system: ActorSystem = ActorSystem(“akka-actor-system“)
val greeter = system.actorOf(Props[Greeter])
system ! Greet("kapi", system.deadLetters)
Akka Actor Akka Typed
“Root actor” is not user-defined for ActorSystem[T]
Encourages thinking about supervision.
doc.akka.io/docs/akka/2.4.0-RC1/scala/typed-actors.html
Akka 2.4 Typed (experimental)
Akka Distributed Data
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
New module, experimental!
Akka 2.4 Distributed Data (experimental)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
for “small, fast data”
Implements various CRDTs and gossips changes through the Cluster.
CRDTs = Conflict-free Replicated Data TypesData structures that can be concurrently updatedand always eventually converge on the same value.
doc.akka.io/docs/akka/2.4.0-RC1/scala/distributed-data.html
Akka 2.4 Distributed Data (experimental)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
for “small, fast data”
Implements various CRDTs and gossips changes through the Cluster.
CRDTs = Conflict-free Replicated Data TypesData structures that can be concurrently updatedand always eventually converge on the same value.
doc.akka.io/docs/akka/2.4.0-RC1/scala/distributed-data.html
Akka 2.4 Distributed Data (experimental)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
value = 5n1: 2n2: 0n3: 3 Akka Cluster (gossip)
GCounter example:
value = 5n1: 2n2: 0n3: 3
value = 5n1: 2n2: 0n3: 3
node-1 node-2
node-3
doc.akka.io/docs/akka/2.4.0-RC1/scala/distributed-data.html
Akka 2.4 Distributed Data (experimental)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
value = 6n1: 2+1n2: 0n3: 3 Akka Cluster (gossip)
GCounter example:
value = 5n1: 2n2: 0n3: 3
value = 6n1: 2n2: 0n3: 3+1
node-1 node-2
node-3
doc.akka.io/docs/akka/2.4.0-RC1/scala/distributed-data.html
Akka 2.4 Distributed Data (experimental)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
node-1 node-2
node-3
value = 7n1: 2+1n2: 0
n3: 3+1 Akka Cluster (gossip)
GCounter example:
value = 5n1: 2n2: 0n3: 3
value = 6n1: 2n2: 0n3: 3+1
doc.akka.io/docs/akka/2.4.0-RC1/scala/distributed-data.html
Akka 2.4 Distributed Data (experimental)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
node-1 node-2
node-3
value = 7n1: 2+1n2: 0
n3: 3+1 Akka Cluster (gossip)
GCounter example:
value = 7n1: 2+1n2: 0
n3: 3+1
value = 7n1: 2+1n2: 0n3: 3+1
doc.akka.io/docs/akka/2.4.0-RC1/scala/distributed-data.html
Akka 2.4 Distributed Data (experimental)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
implicit val node = Cluster(system)val replicator = DistributedData(system).replicator val Counter1Key = PNCounterKey("counter1")
replicator ! Update(Counter1Key, PNCounter(), WriteLocal)(_ + 1)
doc.akka.io/docs/akka/2.4.0-RC1/scala/distributed-data.html
Akka 2.4 Distributed Data (experimental)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Provided data types:• Counters: GCounter, PNCounter• Sets: GSet, ORSet• Maps: ORMap, ORMultiMap, LWWMap, PNCounterMap• Registers: LWWRegister, Flag
doc.akka.io/docs/akka/2.4.0-RC1/scala/distributed-data.html
Akka Streams & Http
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
1.0 (experimental) currently.will join the Akka 2.4.x release.
Akka Streams & Http (experimental, to eventually join Akka 2.4.x)
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
Akka StreamsAsynchronous Back-pressured Stream ProcessingAn implementation of Reactive Streams.
Reactive Streamsan initiative co-lead by Typesafe, Netflix, Pivotal, RedHat),allowing for inter-op of asynchronous streaming libraries.
Akka Http Superseeds Spray.io, the well known high-performance Http serverFully based on Akka Streams.
http://doc.akka.io/docs/akka-stream-and-http-experimental/1.0/scala.html
http://www.reactive-streams.org/
Reactive Streams (1.0, en route to be included in JDK9)
Akka Streams <-> Actors – Advanced
val subscriber = ActorSubscriber( system.actorOf(Props[SubStreamParent], ”parent”))
Source(1 to 100) .map(_.toString) .filter(_.length == 2) .drop(2) .conflate(seed => seed)((acc, i) => acc + i) .groupBy(_.last) .runWith(subscriber)
All the usual ops available for Linear Flows.
http://doc.akka.io/docs/akka-stream-and-http-experimental/1.0/scala.html
Links• akka.io• reactive-streams.org• akka-user• https://www.typesafe.com/subscription
• Streams and Http• http://doc.akka.io/docs/akka-stream-and-http-exp
erimental/1.0/scala.html• http://doc.akka.io/docs/akka-stream-and-http-exp
erimental/1.0/java.html
• Akka 2.4 RC1• http://doc.akka.io/docs/akka/2.4.0-RC1/scala.html• http://doc.akka.io/docs/akka/2.4.0-RC1/java.html
Akka 2.4 and RP commercial featureswith Konrad `@ktosopl` Malawski
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