Design a Caching for Cockroach Labs
Last updated: July 28, 2025
Quick Overview
Design a multi-tenant caching system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Cockroach Labs
July 28, 202520
14
3,691 solved
Design a multi-tenant caching system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
System design interviews at Cockroach Labs typically last 45-60 minutes. You are expected to drive the conversation, starting from requirements gathering through to a detailed architecture. The interviewer will evaluate your ability to handle ambiguity and make practical engineering decisions.
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
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 handle a region-wide outage?
- What monitoring and alerting would you set up on day one?
- How would you handle schema migrations with zero downtime?
- How would you implement rate limiting to protect the system?
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Requirements
Functional Requirements
- Multi-tenancy: The caching system must support multiple tenants, ensuring data isolation.
- Request Handling: It should handle millions of read and write reques...
Capacity Estimation
Assuming we need to support 10 million requests per second at peak times:
- Read Requests: 90% of requests are reads. Therefore, 9 million reads/second.
- Write Requests: 10% of requests are...
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