error-handling-patterns

Retry logic with exponential backoff handles transient errors by progressively increasing the wait time between consecutive retry attempts. This pattern prevents system overload during temporary network failures or service disruptions in distributed architectures.

A circuit breaker pattern prevents cascading failures in distributed systems by monitoring service calls and tripping into an open state when failures exceed a threshold. It routes requests to fallback logic until the downstream service recovers.

Dead-letter queues capture messages that fail processing after exhausting retry attempts and circuit breaker thresholds. They store these failed payloads for offline analysis, ensuring no data is lost during complex system failures.

Compensating transactions are needed when a distributed system must reverse a partially completed multi-step operation after a failure. They undo prior successful steps to maintain data consistency without distributed locks.

Optimize fault tolerance by combining retry patterns, circuit breakers, and dead-letter queues using a decision tree for error resolution. This multi-layered strategy isolates failures, prevents cascading crashes, and ensures system reliability.