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Go MySQL Driver Bug Fixes

1 post · May 2020

What this trail covers

This feature thread tracks the evolution of addressing critical bugs and performance issues within the Go MySQL driver, particularly as it's used in production systems like GitHub's authorization service. It covers identifying and fixing elusive bugs like 'Invalid connection (unexpected EOF)' and improving connection handling under challenging network conditions.

All GitHub trails
  1. Three bugs in the Go MySQL DriverThis post details the identification and upstream fix for the 'Invalid connection (unexpected EOF)' bug in the Go MySQL driver. It explains how server-side idle timeouts combined with the MySQL wire protocol's client-managed command phase can lead to the server closing a connection without the client being immediately aware. The post also discusses why returning `driver.ErrBadConn` is not always safe for certain operations (like UPDATEs) and explores workarounds and the eventual introduction of `SessionResetter` as a solution.