Idempotency in Distributed Systems That Actually Works

Idempotency is crucial in distributed systems to prevent duplicate side effects, which can be caused by network failures, retries, and message redelivery. It's not just about HTTP methods, but a business guarantee that ensures the same action isn't performed multiple times. To achieve idempotency, focus on system properties, not just transport features. This involves designing systems that prevent duplicate side effects, even in the presence of failures and retries. Start by understanding integration patterns, code design, and data access.