CAP Theorem in Practice
Design a small subsystem that relies on CAP Theorem in Practice. Outline components, data flow, failure modes, and metrics.
Answers use simple, clear English.
Audio N/AQuick interview answer
Use CAP Theorem in Practice as the core idea. Example shape: Bank balance during partition: CP (reject writes).
Detailed answer
Use CAP Theorem in Practice as the core idea. Example shape: Bank balance during partition: CP (reject writes). Social feed likes: AP (eventual counts).. Watch for: Oversimplified — real systems offer levels not binary.. Measure success via latency/error/saturation. Core: Under partition, choose Consistency or Availability (CP vs AP). Most systems are PA with tunable consistency. PACELC extends with latency trade-off. Real-time example: Bank balance during partition: CP (reject writes). Social feed likes: AP (eventual counts). Pros: Frames trade-offs for interviews clearly. Cons: Oversimplified — real systems offer levels not binary. Common mistakes: Claiming CA without partition definition. Best practices: Name concrete choice per feature; mention quorum reads. Audience level: Mid-level.
Full explanation
Under partition, choose Consistency or Availability (CP vs AP). Most systems are PA with tunable consistency. PACELC extends with latency trade-off.
Real example & use case
Bank balance during partition: CP (reject writes). Social feed likes: AP (eventual counts).
Pros & cons
Pros: Frames trade-offs for interviews clearly. Cons: Oversimplified — real systems offer levels not binary.
Common mistakes
Claiming CA without partition definition.
Best practices
Name concrete choice per feature; mention quorum reads.
Follow-up questions
- How would you test CAP Theorem in Practice?
- What metrics prove CAP Theorem in Practice is healthy in prod?
- How does CAP Theorem in Practice change at 10× traffic?