I am having some troubles understanding the finer details of the PoisonPill.
As I understand it, it is a normal message, and will be processed AFTER the
persist-callback is executed.
I have the following code in my onReceiveCommand:
System.out.println("About to persist: " + message);
persist(message, o -> System.out.println("Persisted: " + o));
When I run the following against this actor 8not using TestActorRef):
actorRef.tell("Test message", getTestActor());
Thread.sleep(1000L);
actorRef.tell(PoisonPill.getInstance(), getTestActor());
Thread.sleep(1000L);
I get the expected output:
About to persist: Test message
Persisted: Test message
If I remove the sleep between the messages, I sometimes get the following:
[INFO] [04/16/2015 15:50:11.183] [Test-System-akka.actor.default-dispatcher-
5] [akka://Test-System/user/my-actor] Message [akka.persistence.Recover]
from Actor[akka://Test-System/user/my-actor#867538471] to
Actor[akka://Test-System/user/my-actor#867538471] was not delivered. [1]
dead letters encountered. [...]
How is this possible? It seems the PoisonPill arrived first... But message
ordering should be guaranteed between sender (testActor) and my actor,
right?
If I add a short sleep between the two tell, I sometimes get different
(internal) messages in deadletters.
Best regards,
Anders
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