Pramod J. Sadalage books

NoSQL Distilled: A Brief Guide to the Emerging World of Polyglot Persistence (2012)

Good for what it is-- a slim high level overview of NoSQL that gives you historical context and discusses key concepts like CAP theorem, distribution strategies (sharding, master/slave replication, peer to peer replication) and store types (key value, column family, document-based, graph). But, t...