Design Messaging Infrastructure for microservices
Last updated: May 11, 2026
Quick Overview
Design a distributed messaging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Cruise
May 11, 202648
14
1,198 solved
Design a distributed messaging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
This is a common system design question asked during System Design Round at Cruise. The interviewer expects you to demonstrate your ability to design large-scale distributed systems, make well-reasoned trade-offs, and communicate your thought process clearly. Cruise values engineers who can think about scalability from day one.
What the Interviewer Expects
- Systematically gather requirements and estimate capacity (QPS, storage, bandwidth)
- Design a scalable architecture with clear component responsibilities
- Make well-reasoned database and caching decisions with trade-off analysis
- Address consistency vs availability trade-offs specific to the use case
- Discuss partitioning strategy, replication, and data modeling
- Cover failure handling, monitoring, and alerting strategies
Key Topics to Cover
How to Approach This
- Start by clarifying functional and non-functional requirements with the interviewer.
- Estimate the scale: QPS, storage, bandwidth. This drives your design decisions.
- Draw a high-level architecture first, then deep dive into 1-2 critical components.
- Discuss trade-offs explicitly (e.g., consistency vs availability, SQL vs NoSQL).
- Address failure scenarios, monitoring, and how the system handles 10x traffic spikes.
Possible Follow-up Questions
- How would you implement rate limiting to protect the system?
- How would you handle schema migrations with zero downtime?
- How do you ensure data consistency across multiple services?
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Requirements
Functional Requirements
- Message Sending and Receiving: The system must support sending and receiving messages between microservices in real-time.
- Message Persistence: Messages should...
Capacity Estimation
To estimate capacity, let's assume:
- Number of Microservices: 50
- Average Messages per Service: 100 messages/sec
- Total Messages: 50 services * 100 messages/sec = 5000 messages/sec
- **...
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