Microservices Microservice Design Patterns 3

Question 1

What does the CQRS pattern separate?

Accepted Answer

Command (write) and query (read) responsibilities

Answer

CQRS splits the model used to update data from the model used to read it.

Question 2

Event Sourcing persists application state as what?

Accepted Answer

A sequence of immutable events

Answer

Event Sourcing stores every state change as an append-only event log.

Question 3

The Bulkhead pattern improves resilience by doing what?

Accepted Answer

Isolating resources so one failure doesn't sink the whole system

Answer

Bulkheads partition resources like thread pools so a fault stays contained.

Question 4

A Sidecar deploys a helper component in what relationship to the main service?

Accepted Answer

Alongside it, sharing the same lifecycle/host

Answer

A sidecar runs next to the primary application, providing supporting features like logging or proxying.

Question 5

What does the Service Discovery pattern address?

Accepted Answer

Locating dynamic network addresses of service instances

Answer

Service Discovery lets clients find instances whose addresses change dynamically.

Microservices Practice Test