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...

We have built an implementation of CORFU [1] (the protocol Tango is based on) that runs on Ceph/RADOS, called ZLog [0]. We have a very simple prototype of Tango running ZLog. ZLog could run on other storage systems like Kafka but we have only focused on Ceph/RADOS as the underlying storage.

[0]: https://github.com/noahdesu/zlog

[1]: https://www.usenix.org/conference/nsdi12/technical-sessions/...

Apache Samza, also from LinkedIn, is built on Kafka and I think could be used to do something like this