akka cluster seed nodes give error: dropping message for non-local recipient

Question

I'm trying to create a basic akka cluster on a Win 7 machine from this documentation:
http://doc.akka.io/docs/akka/snapshot/scala/cluster-usage.html

and I'm getting an error when I run the seed nodes (more on them below)

AdriansClusterSystem-akka.actor.default-dispa tcher-16] [akka://AdriansClusterSystem/system/endpointManager/reliableEndpointWr iter-akka.tcp%3A%2F%2FAdriansClusterSystem%40127.0.0.1%3A2552-3/endpointWriter] dropping message [class akka.actor.SelectChildName] for non-local recipient [Act or[akka.tcp://[email protected]:2552/]] arriving at [akka.tcp://ClusterSys [email protected]:2552] inbound addresses are [akka.tcp://[email protected] .0.1:2552]

Question: Why am I getting this error? Did I miss something from the akka documentation?

My .conf file:
I added this extra line *To the file listed at the URL above * enabled-transports = ["akka.remote.netty.tcp"]

akka {
  actor {
    provider = "akka.cluster.ClusterActorRefProvider"
  }
  remote {
    enabled-transports = ["akka.remote.netty.tcp"]  <--added this from remoting
    log-remote-lifecycle-events = off
    netty.tcp {
      hostname = "127.0.0.1"
      port = 0
    }
  }
  cluster {
    seed-nodes = [
    "akka.tcp://[email protected]:2551",
    "akka.tcp://[email protected]:2552"]

  auto-down = on
  }
}

I start the 2 nodes, each in different sbt windows

run-main sample.cluster.simple.SimpleClusterApp 2551  
run-main sample.cluster.simple.SimpleClusterApp 2552

Both of these start up fine then repeatedly show an ERROR message:

mybuild:-:0.0.1-SNAPSHOT>`run-main sample.cluster.simple.SimpleClusterApp 2552`
[warn] Credentials file C:\Users\amocanu\.ivy2\.credentials does not exist  <-- ?
[info] Running sample.cluster.simple.SimpleClusterApp 2552
 args[0]= 2552
[INFO] [07/31/2013 10:50:00.397] [run-main] [Remoting] Starting remoting
[INFO] [07/31/2013 10:50:00.661] [run-main] [Remoting] Remoting started; listeni
ng on addresses :[akka.tcp://[email protected]:2552]
[INFO] [07/31/2013 10:50:00.710] [run-main] [Cluster(akka://AdriansClusterSystem
)] Cluster Node [akka.tcp://[email protected]:2552] - Starting up..
.
[INFO] [07/31/2013 10:50:00.823] [run-main] [Cluster(akka://AdriansClusterSystem
)] Cluster Node [akka.tcp://[email protected]:2552] - Registered cl
uster JMX MBean [akka:type=Cluster]
[INFO] [07/31/2013 10:50:00.823] [run-main] [Cluster(akka://AdriansClusterSystem
)] Cluster Node [akka.tcp://[email protected]:2552] - Started up su
ccessfully
[INFO] [07/31/2013 10:50:00.868] [AdriansClusterSystem-akka.actor.default-dispat
cher-2] [Cluster(akka://AdriansClusterSystem)] Cluster Node [akka.tcp://AdriansC
[email protected]:2552] - Metrics will be retreived from MBeans, and may be
 incorrect on some platforms. To increase metric accuracy add the 'sigar.jar' to
 the classpath and the appropriate platform-specific native libary to 'java.libr
ary.path'. Reason: java.lang.ClassNotFoundException: org.hyperic.sigar.Sigar
[INFO] [07/31/2013 10:50:00.874] [AdriansClusterSystem-akka.actor.default-dispat
cher-2] [Cluster(akka://AdriansClusterSystem)] Cluster Node [akka.tcp://AdriansC
[email protected]:2552] - Metrics collection has started successfully
[INFO] [07/31/2013 10:50:00.883] [AdriansClusterSystem-akka.actor.default-dispat
cher-13] [akka://AdriansClusterSystem/user/clusterListener] Current members:
[ERROR] [07/31/2013 10:50:01.003] [AdriansClusterSystem-akka.actor.default-dispa
tcher-3] [akka://AdriansClusterSystem/system/endpointManager/reliableEndpointWri
ter-akka.tcp%3A%2F%2FAdriansClusterSystem%40127.0.0.1%3A2551-0/endpointWriter] d
ropping message [class akka.actor.SelectChildName] for non-local recipient [Acto
r[akka.tcp://[email protected]:2552/]] arriving at [akka.tcp://ClusterSyst
[email protected]:2552] inbound addresses are [akka.tcp://[email protected].
0.1:2552]
[ERROR] [07/31/2013 10:50:01.009] [AdriansClusterSystem-akka.actor.default-dispa
tcher-16] [akka://AdriansClusterSystem/system/endpointManager/reliableEndpointWr
iter-akka.tcp%3A%2F%2FAdriansClusterSystem%40127.0.0.1%3A2552-3/endpointWriter]
dropping message [class akka.actor.SelectChildName] for non-local recipient [Act
or[akka.tcp://[email protected]:2552/]] arriving at [akka.tcp://ClusterSys
[email protected]:2552] inbound addresses are [akka.tcp://[email protected]
.0.1:2552]

If now I do

run-main sample.cluster.simple.SimpleClusterApp

which is supposed to choose a random port and run a seed node on, it starts of well just as the other 2 seed nodes, then shows a class not found exception as INFO and no current members

[INFO] [07/31/2013 11:19:36.612] [AdriansClusterSystem-akka.actor.default-dispat
cher-3] [Cluster(akka://AdriansClusterSystem)] Cluster Node [akka.tcp://AdriansC
[email protected]:54824] - Metrics will be retreived from MBeans, and may b
e incorrect on some platforms. To increase metric accuracy add the 'sigar.jar' t
o the classpath and the appropriate platform-specific native libary to 'java.lib
rary.path'. Reason: java.lang.ClassNotFoundException: org.hyperic.sigar.Sigar
[INFO] [07/31/2013 11:19:36.619] [AdriansClusterSystem-akka.actor.default-dispat
cher-3] [Cluster(akka://AdriansClusterSystem)] Cluster Node [akka.tcp://AdriansC
[email protected]:54824] - Metrics collection has started successfully
[INFO] [07/31/2013 11:19:36.633] [AdriansClusterSystem-akka.actor.default-dispat
cher-12] [akka://AdriansClusterSystem/user/clusterListener] Current members:

Yup it just hangs there and I have to close the sbt window to terminate it.

Answer 1

It looks like your seed nodes are using ClusterSystem as the actor system name but according to your logs you are using AdriansClusterSystem as your actor system name. Try changing the seed nodes to:

seed-nodes = [
"akka.tcp://[email protected]:2551",
"akka.tcp://[email protected]:2552"]