Spring Cloud Communication & Stakeholder Relations 4

Question 1

A stakeholder wants to understand how service instances register themselves in Spring Cloud. Which annotation on the main class enables Eureka client registration?

Accepted Answer

@EnableDiscoveryClient

Answer

@EnableDiscoveryClient activates the service discovery client, allowing the application to register with and query a Eureka (or Consul/Zookeeper) registry.

Question 2

A project manager asks what happens to in-flight requests during a rolling deployment when Spring Cloud LoadBalancer removes a deregistering instance. Which mechanism protects these requests?

Accepted Answer

Graceful shutdown with a configurable drain period allows in-flight requests to complete

Answer

Spring Boot's graceful shutdown feature gives the server a drain period to finish in-flight requests before terminating, preventing abrupt failures during rolling deploys.

Question 3

A DevOps engineer asks how to communicate a new Spring Cloud Config property to only a subset of microservices without restarting all of them. What is the best approach?

Accepted Answer

Use Spring Cloud Bus with destination filtering to target specific services

Answer

Spring Cloud Bus supports destination filtering on the /actuator/busrefresh/{destination} endpoint to trigger refresh only on specific service instances.

Question 4

A compliance officer asks whether Spring Cloud Sleuth's trace data can be exported to Zipkin for audit purposes. What configuration is required?

Accepted Answer

Add spring-cloud-starter-zipkin and set spring.zipkin.baseUrl

Answer

Adding spring-cloud-starter-zipkin and configuring spring.zipkin.baseUrl enables automatic trace export from Sleuth to a Zipkin server.

Question 5

A stakeholder asks how Spring Cloud Gateway handles retries for failed upstream service calls. Which filter provides this capability?

Accepted Answer

Retry GatewayFilter

Answer

The Retry GatewayFilter in Spring Cloud Gateway retries failed requests a configurable number of times on specified HTTP status codes or exceptions.

Spring Cloud Practice Test

Spring Cloud Practice Test

Spring Cloud Communication & Stakeholder Relations 4