[botirk]

I built FastKey, a Redis-compatible key-value store written from scratch in C.

It started as a project to understand Redis internals.

It turned into a complete implementation with real-world features.

Key features: → Full RESP protocol compatibility (works with redis-cli and Redis clients) → Master-slave replication with PSYNC → Streams support (XADD, XRANGE, XREAD) → Transactions (MULTI / EXEC / DISCARD) → Thread-safe concurrent handling with read-write locks → RDB persistence format → 256 tests with 100% pass rate

The focus was on memory safety, proper cleanup, and thread safety. The code is clean C with a modular architecture so you can actually follow how things work.

This could be useful as: → A learning resource for anyone curious about Redis internals → A lightweight alternative when you need Redis compatibility without the full Redis overhead

I would love feedback on the architecture, threading model, and implementation details.