CMA - Certified Master Architect Architectural Design and Patterns Questions and Answers

Question 1

A rapidly growing e-commerce platform is transitioning from a monolithic architecture to microservices. They need to ensure data consistency for transactions that span multiple services, such as processing an order which involves updating inventory, charging the customer, and arranging for shipping. If any of these steps fail, the entire transaction must be rolled back. Which architectural pattern is most suitable for managing this multi-service transaction?

Accepted Answer

Saga Pattern

Answer

The Saga pattern is designed to manage data consistency across multiple microservices in a distributed transaction. It sequences a series of local transactions and includes compensating transactions to undo changes if a step fails, ensuring the system returns to a consistent state.

Question 2

An enterprise is planning to modernize a large, business-critical legacy monolithic application. A 'big bang' rewrite is considered too risky due to the potential for service disruption. The goal is to incrementally replace parts of the legacy system with new microservices over time, while the entire application remains operational for users. Which design pattern provides a structured approach for this gradual migration?

Accepted Answer

Strangler Fig Pattern

Answer

The Strangler Fig pattern is an architectural approach for incrementally migrating a legacy system by gradually replacing specific pieces of functionality with new applications and services. It involves creating a facade that intercepts requests to the old system and routes them to either the legacy code or the new services, allowing the new system to grow over the old one until the legacy system is eventually 'strangled' and decommissioned.

Question 3

A financial services application requires a complete and immutable audit trail of all transactions. For compliance and analytical purposes, the business needs the ability to reconstruct the state of any account at any point in history. Simply storing the current state of the data is insufficient. Which pattern best addresses this requirement?

Accepted Answer

Event Sourcing

Answer

Event Sourcing is a pattern where all changes to an application's state are stored as a sequence of events. This append-only log of events provides a full audit trail and allows for the reconstruction of an entity's state at any point in time by replaying the events. This is ideal for systems requiring strong audit capabilities.

Question 4

A complex system has significantly different requirements for reading and writing data. The read operations are frequent, high-volume, and need to be highly optimized for performance using denormalized data structures. The write operations are less frequent but involve complex business logic and validation on a normalized model. Which pattern would be most effective for architecting this system?

Accepted Answer

Command Query Responsibility Segregation (CQRS)

Answer

The Command Query Responsibility Segregation (CQRS) pattern separates the models for reading (Query) and writing (Command) data. This allows for independent optimization and scaling of the read and write workloads, making it ideal for scenarios with asymmetric operational needs.

Question 5

Which of the following is a significant drawback when choosing a microservices architecture over a monolithic architecture for a small, startup team with a tight deadline for their initial product launch?

Accepted Answer

Higher initial operational complexity and overhead.

Answer

While microservices offer scalability and flexibility, they introduce significant operational overhead and complexity, especially for a small team. This includes setting up and managing distributed systems, service discovery, inter-service communication, and distributed monitoring, which can slow down initial development compared to a simpler monolithic approach.

(CMA) Certified Master Architect Practice Test

(CMA) Certified Master Architect Practice Test

CMA - Certified Master Architect Architectural Design and Patterns Questions and Answers