Hyperdrive (Product): news timeline & CVEs

Inside Hyperdrive: How we solved a rare Hyperdrive MySQL caching bug

Cloudflare made Hyperdrive MySQL generally available after fixing a rare cache bug that returned empty results.

Cloudflare said Hyperdrive, its database connection pooler for Workers, now supports MySQL generally after a beta that required about 20 bug fixes. Engineers corrected character-set handling by negotiating utf8mb4 and reapplying it after COM_RESET_CONNECTION. A rare caching bug, seen about 0.001 percent of the time for one high-volume customer and only when caching was enabled, returned empty results for queries that should have had data. Cloudflare traced it to shared CDN-cache behavior between Hyperdrive client and endpoint nodes running in the same data center.

Cloudflare BlogOct 14, 13:00 UTC · 2d agoOther1· 1 read

Under the hood, off the hot path: How D1 scales to millions of databases

Cloudflare explains how the D1 control plane scales to millions of serverless SQLite databases.

Cloudflare describes control-plane changes that let D1, its serverless SQLite service, support platforms creating millions of small databases. As of October 8, 2026, live non-deleted databases had grown 15x in one year and 65x in two, while daily active databases grew 18x in a year. Each database maps to a SQLite Durable Object; query traffic stays off a single-region hot path via Workers KV, an Eyeball Worker, and Hyperdrive-backed Postgres replicas. OpenAI's ChatGPT Sites is cited as a production user.

Cloudflare BlogOct 13, 16:20 UTC · 3d agoAI tools & infra1· 1 read

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Inside Hyperdrive: How we solved a rare Hyperdrive MySQL caching bug

Under the hood, off the hot path: How D1 scales to millions of databases