Hi Anders,
the problem is that PoisonPill is an AutoReceiveMessage, meaning that the
PersistentActor trait does neither see it nor can it do anything about it—it
will be handled not matter whether persistence callbacks are outstanding or
not. We will eventually remove this message since it is so special, my
recommendation is to explicitly create a TerminatePlease message for your Actor
which then is handled in the normal way (and at the expected times).
Regards,
Roland
16 apr 2015 kl. 16:00 skrev Anders Båtstrand ander...@gmail.com:
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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