How Retries Amplify Failures Into Disasters

Retries appear to be a straightforward reliability solution for distributed systems, but they can amplify failures catastrophically. When applied to operations with side effects—such as charging cards or sending emails—a retry can cause duplicate charges, duplicate messages, or cascading system outages. The core danger is that network timeouts can mask successful server-side operations from the client, transforming what appears to be a failed request into a disaster when retried.