Spring Cloud Spring Cloud Circuit Breaker & Resilience 3

Question 1

When both @Retry and @CircuitBreaker are applied to the same method in Resilience4j, what is the default execution order?

Accepted Answer

Retry wraps CircuitBreaker, so retries happen before the circuit counts a failure

Answer

CircuitBreaker wraps Retry, so the circuit is checked before retrying

Answer

Both execute simultaneously in separate threads

Answer

Only the outermost annotation takes effect

Question 2

What Spring Boot Actuator property must be set to true to expose Resilience4j circuit breaker health indicators?

Accepted Answer

management.health.circuitbreakers.enabled

Answer

resilience4j.circuitbreaker.health.enabled

Answer

spring.cloud.resilience.health

Answer

actuator.resilience4j.indicators.enabled

Question 3

What does the 'slowCallRateThreshold' property configure in Resilience4j?

Accepted Answer

The percentage of calls considered slow that will trigger the circuit to open

Answer

The maximum acceptable response time per individual call

Answer

The retry delay threshold before a call is reclassified as slow

Answer

The rate at which calls are downgraded to cached responses

Question 4

How does Resilience4j support sharing a base configuration across multiple circuit breaker instances?

Accepted Answer

By defining a 'default' configuration that other instances inherit via the baseConfig property

Answer

By extending a parent Spring bean definition

Answer

By using separate Spring profiles per circuit breaker instance

Answer

By importing a shared YAML anchor into each instance block

Question 5

What is the purpose of the 'ignoreExceptions' property in a Resilience4j circuit breaker configuration?

Accepted Answer

To list exception types that should not be counted as failures when calculating the failure rate

Answer

To suppress stack trace output in application logs

Answer

To skip retry logic for specified exception types

Answer

To disable the circuit breaker for methods throwing certain exceptions

Question 6

Which Resilience4j feature limits the execution time of a callable and triggers a fallback if the time limit is exceeded?

Accepted Answer

TimeLimiter

Answer

RateLimiter

Answer

Bulkhead

Answer

Retry

Question 7

In Resilience4j, which bulkhead type uses a semaphore to limit concurrent calls rather than a separate thread pool?

Accepted Answer

SemaphoreBulkhead

Answer

ThreadPoolBulkhead

Answer

CountingBulkhead

Answer

FixedBulkhead