A new paper from Google:
Megastore blends the scalability of a NoSQL datastore with the convenience of a traditional RDBMS in a novel way,
and provides both strong consistency guarantees and high availability.
We provide fully serializable ACID semantics within fine-grained partitions of data. This partitioning allows us to synchronously replicate each write across a wide area network with reasonable latency and support seamless failover between datacenters.
This paper describes Megastore’s semantics and replication algorithm.
Megastore seems to be the solution behind the Google App Engine high replication datastore.
Emphases are mine.
Original title and link: Google Megastore: Scalable, Highly Available Storage for Interactive Services (NoSQL databases © myNoSQL)