Spring Cloud Spring Cloud Circuit Breaker & Resilience

Question 1

Which library replaced Hystrix as the recommended circuit breaker in Spring Cloud after Netflix put Hystrix in maintenance mode?

Accepted Answer

Resilience4j

Answer

Sentinel

Answer

Envoy

Answer

Istio

Question 2

What are the three states a circuit breaker cycles through in the circuit breaker pattern?

Accepted Answer

Closed, Open, Half-Open

Answer

Active, Inactive, Pending

Answer

Running, Stopped, Paused

Answer

Enabled, Disabled, Testing

Question 3

Which annotation is used in Spring Cloud Resilience4j to apply a circuit breaker declaratively to a method?

Accepted Answer

@CircuitBreaker

Answer

@HystrixCommand

Answer

@Fallback

Answer

@Resilient

Question 4

What is the role of a fallback method in a Spring Cloud circuit breaker setup?

Accepted Answer

Provide an alternative response when the primary method fails or the circuit is open

Answer

Roll back database transactions on failure

Answer

Automatically retry the failed operation

Answer

Log errors to an external monitoring system

Question 5

Which Resilience4j configuration property sets the percentage of failures required to trip the circuit breaker to Open state?

Accepted Answer

failureRateThreshold

Answer

openThreshold

Answer

breakerLimit

Answer

circuitOpenRate

Question 6

What does the 'slidingWindowSize' property control in a Resilience4j circuit breaker configuration?

Accepted Answer

The number of recent calls analyzed to calculate the failure rate

Answer

The timeout duration for each individual request

Answer

The interval between retry attempts

Answer

The maximum size of the thread pool

Question 7

Which Spring Cloud starter dependency integrates Resilience4j as the circuit breaker implementation for Spring Boot 3 projects?

Accepted Answer

spring-cloud-starter-circuitbreaker-resilience4j

Answer

resilience4j-spring-cloud

Answer

spring-boot-starter-resilience4j

Answer

spring-cloud-resilience4j-starter