Build a event-driven Logging Pipeline
Last updated: October 21, 2025
Quick Overview
Design a event-driven logging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
SpaceX
October 21, 202537
11
2,856 solved
Design a event-driven logging system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
SpaceX 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
- 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?
- What happens if one of your database nodes goes down?
- How would you optimize costs as the system scales?
- How would you handle schema migrations with zero downtime?
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Requirements
Functional Requirements:
- Event Collection: The system should receive log events from various services and applications (e.g., rocket telemetry data, user activity logs).
- **Event Processi...
Capacity Estimation
Assuming SpaceX's operational requirements:
- Scale: Let's say the system needs to handle 10 million log events per day.
- QPS Calculation:
- 10 million logs/day = 10,000,000 / 86400 (secon...
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