Redis

Redis is an in-memory data structure store, used as a distributed, in-memory key–value database, cache and message broker, with optional durability.¹

Books

• Build Your Own Redis with C/C++ - Learn network programming and data structures by coding from scratch.

Software Internals

Redis: zero to hero — recreate Redis, from scratch, in code with your own hands. Dive into and learn software or systems internals.

• mini-redis - Incomplete Redis client and server implementation using Tokio - for learning purposes only (reading code understand Redis internals).
• Write your own miniature Redis with Python

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1. Wikipedia↩