[taeric]

I'm not sure what you are suggesting. There is no getting around "at most/at least once." You can shift the posts, some, but at some point that is your choice. This is a good read on the problem: http://bravenewgeek.com/you-cannot-have-exactly-once-deliver...

[eweise]

"Exactly once delivery" is not the same as "One message at a time". Akka Actors process one message at a time. Akka does no provide exactly once delivery. It default defaults to "at most once".

[taeric]

So, then to go back to the original.

You may not have to do deal with locks at a local level. You absolutely have to deal with locks at a system level.