Design Logging Infrastructure for global users
Last updated: January 24, 2026
Quick Overview
Design a event-driven logging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Cloudflare
System Design
Product Manager
Cloudflare
January 24, 2026Product Manager
System Design Round
System Design
Hard
249
14
1,482 solved
Design a event-driven logging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Cloudflare asks this during the System Design Round to assess your architectural thinking. They want to see how you decompose a complex problem, choose appropriate technologies, and reason about failure modes. Strong candidates proactively discuss monitoring, alerting, and operational concerns.
What the Interviewer Expects
- Drive the design discussion proactively with minimal interviewer guidance
- Perform detailed capacity estimation and use it to inform design decisions
- Design for global scale with multi-region deployment and data consistency
- Deep dive into 2-3 critical components with implementation-level detail
- Address complex trade-offs: CAP theorem, eventual consistency, conflict resolution
- Discuss operational excellence: deployment strategy, chaos engineering, SLOs/SLIs
- Propose a phased rollout plan from MVP to full-scale system
Key Topics to Cover
Requirements gathering and capacity estimation
Load balancing and horizontal scaling
Partitioning and sharding strategies
Message queues and async processing
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 migrate from a monolithic to a microservices architecture?
- What happens if one of your database nodes goes down?
- How would you handle a region-wide outage?
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Requirements
Functional Requirements
- Event Logging: Capture logs from millions of requests in real-time, including request details, timestamps, and status codes.
- Data Retrieval: Provide APIs for ...
Capacity Estimation
Estimation for Daily Log Entries
- Request Volume: Assume Cloudflare processes 1 billion requests daily.
- Log Generation Rate: If each request generates 1 log entry, the system must handl...
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