https://static.googleusercontent.com/media/research.google.com/en//pubs/archive/41344.pdf

Overview

• Distributed relational database management system (RDBMS)
• Google Proprietary Hybrid database that combines high availability, scalability of NOSQL and consistency and usability of traditional SQL
• Built on top of Spanner, which provides synchronous cross-datacenter replication and strong consistency
• Includes distributed SQL query engine, automatic change tracking and publishing

Guarantees

Learnings

• Decoupling compute and storage simplifies the system, allows layered fault-tolerance and scalability. Amazon SQL also leverages this.
• Avoid serial reads in for loops to reduce latency

Techniques

Architecture