Circuit Breaker Pattern in Distributed Systems | System Design Interview | Implement Circuit Breaker
Hi, in this video we’ll talk about Circuit Breaker Pattern and dive deep into the details, how it works, a sample implementation and when to use it.
The Circuit Breaker pattern is a design pattern that helps to prevent cascading failures in distributed systems. It's inspired by the physical circuit breaker that protects electrical circuits from overloading. Just like a physical circuit breaker, the software Circuit Breaker acts as a barrier between the caller and the target service. It monitors the target service for failures, and when a certain threshold is exceeded, it opens the circuit, preventing further calls to the service for a specified period of time. This allows the system to recover from failures and avoids overloading the failed service with excessive requests, which can worsen the situation.
A Circuit Breaker typically has three states: Closed, Open, and Half-Open. When the Circuit Breaker is in the Closed state, it allows requests to pass through to the target service. It monitors the responses from the target service, and if it detects a predefined number of failures or errors, it trips and moves to the Open state. In the Open state, the Circuit Breaker immediately starts rejecting requests, without even trying to contact the target service. This helps to prevent further failures and reduces the load on the failing service. After a specified timeout period, the Circuit Breaker transitions to the Half-Open state, where it allows a limited number of requests to pass through to the target service to check if it has recovered. If these requests are successful, the Circuit Breaker moves back to the Closed state, allowing normal operation to resume. However, if the failures continue, the Circuit Breaker returns to the Open state, and the cycle continues.
TABLE OF CONTENTS
• 00:00 Introduction
• 01:07 What is Circuit Breaker Pattern
• 02:50 Circuit Breaker Pattern Example
• 04:51 Circuit Breaker Pattern design
• 06:42 Circuit Breaker Pattern States
• 09:02 Circuit Breaker Pattern Implementation
• 12:06 Benefits and Considerations of Circuit Breaker Pattern
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• System Design - • FAANG System Design Patterns
• System Design Concepts - • CAP Theorem & PACELC in Distributed System...
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