It focuses on systems handling hundreds of millions of daily active users.
To prevent double-charging during network timeouts, every API call must carry a unique idempotency key. The system validates this key against a distributed cache before executing transactions. system design interview alex xu volume 2 pdf github top
"System Design Interview" by Alex Xu is a well-known resource for those preparing for system design interviews, a crucial part of the hiring process for software engineers, especially at top tech companies. The book is available in two volumes, covering a wide range of system design concepts, from basic principles to more complex systems. It focuses on systems handling hundreds of millions
Routing algorithms, ETA calculation, and handling dynamic traffic updates. and handling dynamic traffic updates.