Apparently, even genuinely web-scale endeavors like Google are realizing that NoSQL (“It’s web-scale!”) can sacrifice too much of the convenience of a traditional relational DBMS.
Last month Google released a paper on its high availability datastore Megastore. 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," the paper says. Megastore is the technology behind Google's High Replication Datastore.
Megastore: Google's Answer to NoSQL Databases - ReadWriteCloud
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