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

Cloudflare has made MySQL support for Hyperdrive generally available after a beta period focused on achieving 99.99% connection reliability for its Workers database connection pooler. Hyperdrive maintains and shares warm database connections across Worker requests and can cache frequent queries globally, reducing connection overhead, latency, and origin database load. Beta testing revealed encoding issues involving emoji support and connection resets, which were resolved by consistently using the utf8mb4 character set. Engineers also investigated a rare issue causing empty query results when caching was enabled and found that shared caches could store MySQL responses encoded for different protocol capability sets used by Hyperdrive and Worker-side client libraries. Cloudflare fixed this by ensuring all cached results use a canonical format based on Hyperdrive’s capabilities, eliminating the reported issue and bringing MySQL support to the production reliability target.

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