How Google uses Berkeley DB HA for user authentication… a case study.

This case study gives a high level overview of Google’s setup for user authentication, interesting read.

… user authentication is a transactional event that requires fast, reliable, scalable, persistence and robust high-availability. To deliver this level of service, Google Accounts uses Berkeley DB HA for the storage and retrieval of user data and for replication, thereby ensuring scalability and availability.

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