Circuit breaker

Question 1

Reliability

Answer 1

Circuit Breaker

Question 2

Circuit Breaker: problem

Answer 2

How to prevent a network or service failure from cascading to other services?

Question 3

Circuit Breaker: solution

Answer 3

A service client should invoke a remote service via a proxy that functions in a similar fashion to an electrical circuit breaker. When the number of consecutive failures crosses a threshold, the circuit breaker trips, and for the duration of a timeout period all attempts to invoke the remote service will fail immediately. After the timeout expires the circuit breaker allows a limited number of test requests to pass through. If those requests succeed the circuit breaker resumes normal operation. Otherwise, if there is a failure the timeout period begins again.

Question 4

Circuit Breaker: result benefits

Answer 4

Services handle the failure of the services that they invoke

Question 5

Circuit Breaker: result issues

Answer 5

It is challenging to choose timeout values without creating false positives or introducing excessive latency.

Question 6

Circuit Breaker: related

Answer 6

The Microservice Chassis might implement this pattern
An API Gateway will use this pattern to invoke services
A Server-side discovery router might use this pattern to invoke services