Mar 24
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In this video, I explain a real production bug to teach an important concept in **Kafka, event-driven architecture, and system design**. We walk through a real food delivery system where: Frontend → Order Service → Orders DB → Kafka → Restaurant Service → Restaurant DB Everything looked correct, but a small mistake in **Kafka message keys** caused events to go to different partitions. Because of this: * Events were consumed in the wrong order * Databases went out of sync * Cancelled orders appeared active * System showed inconsistent state This video explains step-by-step: • How Kafka partitions work • Why message keys are critical • How ordering can break in distributed systems • Why microservices can show different data • How to design event-driven systems safely This is not theory — this is the kind of bug that actually happens in production. If you are learning: Kafka System Design Backend Engineering Microservices Distributed Systems then this example will help you understand a very important real-world problem. Comment **KAFKA** to get the architecture diagram + bug checklist. #kafka #systemdesign #backend #microservices #distributedSystems #softwareengineering #programming #tech #learning