advanced~2h
Event-Driven Architecture with Kafka
Module 18 §4 flagged that a producer shouldn't have to block waiting for every interested service to finish reacting. This module is the mechanism that makes that possible.
Learning objectives
- Beginner: A single producer and single consumer for one event type, within a small system, to see decoupling in action.
- Intermediate: Multiple independent consumer services (inventory, notification, analytics) reacting to the same event, each with its own consumer group, added without ever modifying the producer.
- Advanced: Idempotent consumer logic (e.g. an idempotency key stored per processed order) so at-least-once delivery can never double-charge or double-notify, combined with dead-letter handling for events a consumer can't process even after retries.
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Event-Driven Architecture with Kafka