Making Room for Some Lint

In examining a significant database migration incident at Honeycomb that caused a major outage, the author discusses the construction of errors and their subsequent impact on corrective measures. The incident was triggered by an ENUM modification on a database table that unexpectedly led to a full table rewrite, highlighting the risks of database migrations and the potential for blame within engineering processes. Despite the structured process involving validation and verification checks, errors still occurred, pointing to a need for improved detection of risky migrations. The author suggests that linting MySQL migrations could provide a low-cost feedback loop to catch risky patterns, balancing between training all engineers to be SQL experts and relying on post-issue repair work. Though the newly implemented linter has yet to identify significant issues, it offers a proactive approach to mitigating migration risks by enforcing algorithm specifications and allowing engineers to override checks when necessary. The piece underscores the importance of ownership and experimentation in process improvement, especially during on-call shifts, as a means to address latent system issues and enhance reliability.