"mysql" "Packets out of sync" - workaround

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John_Nagle · 2026-04-21 · via The Rust Programming Language Forum - Latest topics

April 21, 2026, 6:06am 1

Ref: CodecError { Packets out of sync } - possible failed reconnect after timeout · Issue #412 · blackbeam/rust-mysql-simple · GitHub

I have something that connects to a remote MySQL database and sometimes computes for over an hour with no transaction in progress but the MySQL connection pool still alive. Then the next MySQL request fails with

Failed: CodecError { Packets out of sync }

probably because the server closed the connection.

This is probably a bug in lost idle connection recovery; if there's a connection pool, it's the pool manager's job to handle this. So I sent in a bug report.

Known bug? Known workaround?

(What I really need to do is speed up that hour-long compute. I'm scaling something up and it turned out to have a part that's too slow. I can fix that, but would like to see this run to completion before diving into optimization.)

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