I do know that they use Riak. Not sure if that's the only store they're using.
Edit: Yep, skimming the article, I'm almost certain they're talking about Riak EnterpriseDS. Asynchronous replication between multiple datacenters, powered by an Erlang post-commit hook queue.
Edit: Yep, skimming the article, I'm almost certain they're talking about Riak EnterpriseDS. Asynchronous replication between multiple datacenters, powered by an Erlang post-commit hook queue.