We're using eventuate[0], which is an event-sourcing framework with deep support for cooperation via shared logs. It's based on the actor framework akka; akka itself has akka-persistence[1], which is similar but different[2]. All of these techs are usable right now.

Though it doesn't feature either implementation (he does something similar on top of Samza), I like this article[3] on the topic: turning the database inside out really is what we're doing.

[0] http://rbmhtechnology.github.io/eventuate/

[1] http://doc.akka.io/docs/akka/snapshot/scala/persistence.html

[2] http://krasserm.github.io/2015/05/25/akka-persistence-eventu...

[3] https://www.confluent.io/blog/turning-the-database-inside-ou...