Spring Cloud Spring Cloud Circuit Breaker & Resilience 2

Question 1

What is the default sliding window type used by Resilience4j circuit breakers?

Accepted Answer

COUNT_BASED

Answer

TIME_BASED

Answer

RATE_BASED

Answer

THRESHOLD_BASED

Question 2

When does a Resilience4j circuit breaker enter the Half-Open state?

Accepted Answer

After the waitDurationInOpenState has elapsed while the circuit is Open

Answer

When exactly 50% of requests are failing

Answer

During initial circuit breaker startup

Answer

When the fallback method is partially active

Question 3

Which Resilience4j configuration property defines how long the circuit remains in Open state before transitioning to Half-Open?

Accepted Answer

waitDurationInOpenState

Answer

openCircuitTimeout

Answer

breakerResetTime

Answer

recoveryDelay

Question 4

Which Resilience4j pattern limits the number of concurrent calls to a service to isolate failures and prevent resource exhaustion?

Accepted Answer

Bulkhead

Answer

Rate Limiter

Answer

Circuit Breaker

Answer

Retry

Question 5

What does the @RateLimiter annotation control when applied to a method in Resilience4j?

Accepted Answer

The number of calls allowed within a configured time window

Answer

The speed of database read operations

Answer

The network bandwidth consumed per request

Answer

The CPU utilization threshold per service instance

Question 6

What is the purpose of the 'permittedNumberOfCallsInHalfOpenState' property in Resilience4j?

Accepted Answer

It defines how many probe calls are allowed through when the circuit is testing recovery in Half-Open state

Answer

It sets the maximum thread count during service recovery

Answer

It limits request concurrency while the circuit initializes

Answer

It controls the number of retry attempts in degraded mode

Question 7

Which actuator endpoint exposes the current state and metrics of all Resilience4j circuit breakers in a Spring Boot application?

Accepted Answer

/actuator/circuitbreakers

Answer

/actuator/health/circuit

Answer

/actuator/resilience

Answer

/actuator/breakers