Circuit Breaker Simulator — Interactive System Design Lab
Watch a circuit breaker trip as downstream errors accumulate, enter half-open state to test recovery, and return to closed when the service is healthy. Use auto-send mode to drive traffic automatically and watch the breaker open under sustained failure. Understand why circuit breakers are essential in microservice fault tolerance.
Trip the breaker with auto-send, watch half-open recovery, and understand cascading failure protection.
This free interactive simulation runs directly in your browser — no account needed. Adjust the parameters and watch how the system responds in real time.
Concepts covered
- circuit breaker
- fault tolerance
- resilience
- microservices
- failure handling
- half-open
- cascading failure
- bulkhead pattern
Read the guide
- Security — Security is not a feature; it is the foundation. Master AuthN vs AuthZ, the endless Session vs JWT debate, and how to define against the OWASP Top 10.
- Distributed System Patterns — Microservices break things: Transactions, Consistency, and Reliability. Learn the patterns (Circuit Breaker, Saga, Outbox) we use to glue them back together.
Related articles
- How to Answer Any System Design Question — A step-by-step framework for tackling any system design interview question — requirements, estimation, high-level design, and deep dives — with a full worked example (Design a URL shortener) and the phrases interviewers listen for.