I am trying to create an Akka Sharding Cluster. I want to use proxy only
mode on one of the nodes just to route the message to the shard regions. I
am getting the following Warning:
[WARN] [02/11/2019 17:04:17.819]
[ClusterSystem-akka.actor.default-dispatcher-21]
[akka.tcp://ClusterSystem@127.0.0.1:2555/system/sharding/ShardnameProxy]
Trying to register to coordinator at
[Some(ActorSelection[Anchor(akka.tcp://ClusterSystem@127.0.0.1:2551/),
Path(/system/sharding/ShardnameCoordinator/singleton/coordinator)])], but
no acknowledgement. Total [1] buffered messages.
**Main.java: ** Starts the cluster using the configuration from
application.conf(code added latter)
object Main {
val shardName = "Shardname"
val role = "Master"
var shardingProbeLocalRegin: Option[ActorRef] = None
def main(args: Array[String]): Unit = {
val conf = ConfigFactory.load()
val system = ActorSystem("ClusterSystem",conf.getConfig("main"))
ClusterSharding(system).start(shardName,Test.props,
ClusterShardingSettings(system),ShardDetails.extractEntityId,ShardDetails.
extractShardId)
}
}
**Test.java** : Entity for the Sharding Cluster
object Test {
def props: Props = Props(classOf[Test])
class Test extends Actor {
val log = Logger.getLogger(getClass.getName)
override def receive = {
case msg: String =>
log.info("Message from " + sender().path.toString + " Message
is " + msg)
sender() ! "Done"
}
}
}
**MessageProducer.java(Proxy Only Mode)** Message Producer sends a message
to the Shard every second.
object MessageProducer {
var shardingProbeLocalRegin: Option[ActorRef] = None
object DoSharding
def prop:Props = Props(classOf[MessageProducer])
var numeric : Long = 0
def main(args: Array[String]): Unit = {
val conf = ConfigFactory.load
val system = ActorSystem("ClusterSystem",conf.getConfig(
"messgaeProducer"))
ClusterSharding(system).startProxy(Main.shardName,None,
extractEntityId,extractShardId)
shardingProbeLocalRegin = Some(ClusterSharding(system).shardRegion(
Main.shardName))
val actor = system.actorOf(Props[MessageProducer],"message")
}
}
class RemoteAddressExtensionImpl(system: ExtendedActorSystem) extends
Extension {
def address = system.provider.getDefaultAddress
}
object RemoteAddressExtension extends ExtensionKey[
RemoteAddressExtensionImpl]
class MessageProducer extends Actor{
val log = Logger.getLogger(getClass.getName)
override def preStart(): Unit = {
println("Starting "+self.path.address)
context.system.scheduler.schedule(10 seconds,1 second ,self,
DoSharding)
}
override def receive = {
case DoSharding =>
log.info("sending message" + MessageProducer.numeric)
MessageProducer.shardingProbeLocalRegin.foreach(_ ! "" + (
MessageProducer.numeric))
MessageProducer.numeric += 1
}
}
**application.conf: ** Configuration File
main {
akka {
actor {
provider = "akka.cluster.ClusterActorRefProvider"
}
remote {
log-remote-lifecycle-events = on
netty.tcp {
hostname = "127.0.0.1"
port = 2551
}
}
cluster {
seed-nodes = [
"akka.tcp://ClusterSystem@127.0.0.1:2551"
]
sharding.state-store-mode = ddata
auto-down-unreachable-after = 1s
}
akka.extensions = [
"akka.cluster.metrics.ClusterMetricsExtension",
"akka.cluster.ddata.DistributedData"]
}
}
messgaeProducer {
akka {
actor {
provider = "akka.cluster.ClusterActorRefProvider"
}
remote {
log-remote-lifecycle-events = on
netty.tcp {
hostname = "192.168.2.96"
port = 2554
}
}
cluster {
seed-nodes = [
"akka.tcp://ClusterSystem@127.0.0.1:2551"
//, "akka.tcp://ClusterSystem@127.0.0.1:2552"
]
sharding.state-store-mode = ddata
auto-down-unreachable-after = 1s
}
akka.extensions = ["akka.cluster.metrics.ClusterMetricsExtension",
"akka.cluster.ddata.DistributedData"]
}
}
Am I doing anything wrong? Is there any other way to apply for this
approach. My main aim is to avoid Single Point of failure for my cluster.
If any node goes down then it should not affect any other state. Can anyone
help me with this?
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