Cassandra - the non SQL distributed database.
Recently twitter spoke about how they switched onto it (from heavily
sharded MySQL). Note that it originated at facebook. So we have 2 of
the biggest (and probably most important) social network platforms of
our times depending on it now, and it is
In Akka (www.akkasource.org) we have a Cassandra backend for our persistence
API as well as a DSLish Scala coating over the Thrift Java interface.
(supporting connection pooling etc)
http://doc.akkasource.org/persistence
All in all Cassandra is an interesting product with impressive capabilities
