Elementary Akka Setup Example

[tupol]

The Elementary Akka Setup does not work out of the box for Zipkin.

The following are a few references about the environment:

• scala: 2.13.1
• akka: 2.6.8
• kamon-bundle: 2.1.6 ("io.kamon" %% "kamon-bundle")
• kamon-zipkin: 2.1.6 ("io.kamon" %% "kamon-zipkin")
• Zipkin image: docker run -d -p 9411:9411 openzipkin/zipkin
• -javaagent:/..full..path../kanela-agent-1.0.6.jar
• kamon.trace.join-remote-parents-with-same-span-id = yes

[tupol]

With the kind help from @ivantopo we found the following solution:

• add kamon.trace.sampler="always" to the kamon configuration
• since the project is only about actors, it seems that actors do not start spans by themselves, but just participate in a span, so I had to wrap the actor interaction with Kamon.runWithSpan(span) { ... } to trigger the span creation.
  In the end the AkkaQuickstart class looked like

object AkkaQuickstart extends App {
  Kamon.init()
  val greeterMain: ActorSystem[GreeterMain.SayHello] = ActorSystem(GreeterMain(), "AkkaQuickStart")
  Kamon.runWithSpan(Kamon.serverSpanBuilder("operation-name", "component-name").start()) {
    greeterMain ! SayHello("Charles")
  }