Dev.to
5/10/2026
Engineer spots critical bug in
Original: A senior engineer spotted a bug in my pipeline. I fixed it the same day. Here is what I learned.
Short summary
A developer discovered a critical reliability bug in their event-driven order pipeline: orders could be saved to PostgreSQL but never published to Kafka if the application crashed between operations. The outbox pattern solves this by writing the order and event marker in a single database transaction, then asynchronously publishing via a background service, guaranteeing consistency even under failure.
- •Two-operation pattern has a race condition gap that breaks at scale
- •Outbox pattern: write order and event marker in single transaction, publish async
- •Background service with retries ensures reliability without manual intervention
Generated with AI, which can make mistakes.
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