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Hyperdrive’s MySQL GA followed 20 fixes and a rare caching bug

blog.cloudflare.com by Pranoy Dutta 9 min read Editor score 7/10

The MySQL connection pooler reached GA after beta testing against a 99.99% availability target and uncovering a subtle production caching bug. Its reliability lessons matter to engineers operating distributed database infrastructure.

What: Hyperdrive, Cloudflare’s database connection pooler for Workers, has made MySQL support generally available after beta reliability work.
How: It shares warm SQL connections across Worker requests and can cache common queries; a rare bug arose because COM_RESET_CONNECTION restored the server’s default encoding.
Why it matters: Connection pooling can avoid repeated, costly database handshakes, but pooled-session cleanup must restore required connection settings to prevent subtle failures.

Hyperdrive routes Worker database requests through pooled connections and can use the CDN cache for common queries. Sketched from the article's own text.

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