Dev rebuilds Radish: a Redis server running entirely inside a Cloudflare Durable Object
whoiskatrin · x · 2026-09-16
Dhravya Shah shared his weekend experiment Radish: a Redis server running entirely inside a Cloudflare Durable Object, built partly to test how much GPT-6 Astra and Fable have improved at systems and database design.
- ACID compliant, with DO SQLite as hot storage and R2 as cold storage beyond 10GB; fully serverless.
- Multi-tenant by design: you can run a Redis server per user.
- Trade-offs: roughly an order of magnitude lower QPS than a single-node Redis, not prod-ready, and Workers/DOs lack inbound TCP.
The reshare notes that Durable Objects are underrated tech — people have built Git, Redis, games, CRDT servers, agent harnesses and distributed queues on top.
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