Your Kafka Consumer Will See Every Event Twice - Here's How to Handle It

It's 2 a.m., and your on-call phone buzzes. A customer was charged twice for the same order. You dig into the logs - the OrderCreated event was processed, then processed again seconds later. Nothing crashed. No exception was thrown. Kafka did exactly what it promised: it delivered the message at least once. The bug isn't in Kafka. It's an... Weiterlesen