The issue seems that you want using the AtLeastOnceDelivery Only,but not 
the PersistentActor right?
I think it should be handy that only minxin the AtLeastOnceDelivery to the 
normal actor,I haven't try that.

在 2014年11月9日星期日UTC+8下午7时59分41秒,Burak Emre Kabakcı写道:
>
> I use persistent actors in order to accomplish at-least-once message 
> guarantee and it seems Akka uses Leveldb for persisting events to disks. 
> However I'm not actually satisfied with default journal implementation 
> because while it has the obvious performance drawbacks, I couldn't really 
> understand what the real benefit is. I have a web server in front of Akka 
> and the persistent actor lives in the same JVM with web server. Therefore 
> if the JVM crashes, users will be aware that the server couldn't process 
> the event so JVM failures is not a big deal for me.
>
> I see that people are suggesting in-memory journals for unit testing so I 
> assume that using it in production is considered as a bad practice. I know 
> that Apache Storm also has at-least-once message guarantee and it doesn't 
> persist each event on disk but many companies uses Storm in production 
> without worrying too much about this issue. Can anyone explain why Akka 
> persist messages on disk and what are the other drawbacks of using 
> in-memory journal?
>

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