Netflix architecture overview in Microservices - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Architecture

intermediate

Identify the core components in Netflix's microservices architecture

Netflix uses a microservices architecture to handle millions of users streaming videos simultaneously. Which of the following lists the main components involved in Netflix's architecture?

A API Gateway, Service Discovery, Load Balancer, Data Storage, Monitoring

B Monolithic Server, Single Database, Load Balancer, Cache, CDN

C API Gateway, Single Server, Data Warehouse, Cache, CDN

D Service Discovery, Monolithic Server, Load Balancer, Data Storage, CDN

💡 Hint

Think about how Netflix breaks down its system into small independent services that communicate through APIs.

Netflix's microservices architecture includes an API Gateway to route requests, Service Discovery to find services, Load Balancers to distribute traffic, Data Storage for user and content data, and Monitoring for system health.

❓ scaling

intermediate

How does Netflix handle sudden spikes in user traffic?

Netflix experiences sudden spikes in user traffic during popular show releases. Which scaling strategy best describes how Netflix manages this?

A Auto-scaling microservices with container orchestration and cloud infrastructure

B Using a single powerful server to handle all traffic

C Manually adding more physical servers during spikes

D Limiting user access during peak times to reduce load

💡 Hint

Consider how cloud services and containers help scale automatically.

Netflix uses auto-scaling with container orchestration tools like Kubernetes on cloud infrastructure to dynamically add or remove microservice instances based on traffic.

❓ tradeoff

advanced

Tradeoff between consistency and availability in Netflix's data storage

Netflix stores user data and video metadata across multiple data centers worldwide. What is the main tradeoff Netflix accepts in its data storage system?

A Balances consistency and availability equally without tradeoffs

B Prefers strict consistency over availability, causing occasional downtime

C Uses neither consistency nor availability, focusing only on partition tolerance

D Prefers availability over strict consistency to ensure users can always stream content

💡 Hint

Think about what happens if a data center is unreachable but users still want to watch videos.

Netflix prioritizes availability so users can stream content even if some data is slightly out of sync, accepting eventual consistency.

🧠 Conceptual

advanced

Role of the API Gateway in Netflix architecture

What is the primary role of the API Gateway in Netflix's microservices architecture?

A It monitors system health and logs errors

B It balances load between physical servers only

C It routes client requests to appropriate microservices and handles authentication and rate limiting

D It stores all user data and video content

💡 Hint

Think about how a single entry point manages many microservices behind the scenes.

The API Gateway acts as a single entry point that routes requests, manages authentication, and enforces rate limits before forwarding to microservices.

❓ estimation

expert

Estimate the number of microservice instances needed for 10 million concurrent Netflix users

Assuming each microservice instance can handle 10,000 concurrent users, estimate how many instances are needed to support 10 million concurrent users. Consider Netflix uses 5 critical microservices equally loaded.

A 1000 instances total, 200 per microservice

B 5000 instances total, 1000 per microservice

C 50,000 instances total, 10,000 per microservice

D 10,000 instances total, 2000 per microservice

💡 Hint

Divide total users by capacity per instance, then distribute evenly across microservices.

10 million users / 10,000 users per instance = 1000 instances needed per microservice. With 5 microservices, total is 5000 instances.