Circuit Breaker Module

Overview

A Circuit Breaker is a design pattern that prevents cascading failures in distributed systems by detecting when a service is not responding and stopping requests to it temporarily.

It "trips" the circuit to fallback mode after failures, allowing recovery time.

When to use

Use Circuit Breaker when:

Integrating with unreliable external services or microservices.
Building resilient applications in cloud-native environments.
Handling high-availability requirements for fault-tolerant systems.
Preventing one failing component from affecting the entire application.

Pros

Enhances system resilience by isolating failures.
Reduces load on failing services, aiding faster recovery.
Provides graceful degradation with fallback mechanisms.
Configurable thresholds for failure detection and reset timeouts.
Integrates well with monitoring tools for health checks.

Cons

Requires tuning parameters to avoid false positives/negatives.
Adds complexity to the codebase with state management.
Potential for increased latency during fallback invocations.
Overuse can lead to unnecessary circuit trips in noisy environments.
Not a silver bullet; needs complementary patterns like retries.

Notes

Note: Libraries like Resilience4j (Java) or Polly (.NET) simplify implementation.

Combine with health checks and bulkhead patterns for better isolation.

Log circuit state changes for post-mortem analysis.

Metadata

Category: Backend Concepts
Created: 9 Mar 2026
ID: 0cc4e4a6-493c-438d-b06b-ca6e62081a8a