Spring Cloud Spring Cloud Gateway & Load Balancing 2

Question 1

Which Spring Cloud component replaces Netflix Ribbon for client-side load balancing?

Accepted Answer

Spring Cloud LoadBalancer

Answer

Spring Cloud LoadBalancer is the Spring-native replacement for the deprecated Netflix Ribbon, providing pluggable client-side load balancing strategies.

Question 2

What is the default load balancing algorithm used by Spring Cloud LoadBalancer?

Accepted Answer

Round-robin

Answer

Spring Cloud LoadBalancer uses round-robin as its default algorithm, cycling through available service instances in order.

Question 3

Which Spring Cloud circuit breaker implementation is based on Resilience4j?

Accepted Answer

Spring Cloud CircuitBreaker with Resilience4j

Answer

Spring Cloud CircuitBreaker provides an abstraction with a Resilience4j implementation, replacing the deprecated Netflix Hystrix circuit breaker.

Question 4

What are the three states of a Resilience4j circuit breaker?

Accepted Answer

Open, Closed, Half-Open

Answer

A Resilience4j circuit breaker transitions between Closed (normal operation), Open (blocking calls), and Half-Open (testing recovery) states.

Question 5

In Spring Cloud Gateway, which built-in filter adds a request rate limiting capability to protect downstream services?

Accepted Answer

RequestRateLimiter GatewayFilter

Answer

The RequestRateLimiter GatewayFilter factory in Spring Cloud Gateway uses a backend (e.g., Redis) to enforce rate limits on incoming requests per key.

Spring Cloud Practice Test

Spring Cloud Practice Test

Spring Cloud Spring Cloud Gateway & Load Balancing 2