Design a Search Service
Last updated: June 14, 2026
Quick Overview
Design a geo-distributed search system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Morgan Stanley
June 14, 20265
10
3,330 solved
Design a geo-distributed search 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 Morgan Stanley. 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. Morgan Stanley 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 handle a region-wide outage?
- What would the deployment pipeline look like for this system?
- How would you handle a 10x increase in traffic overnight?
- How would you handle schema migrations with zero downtime?
Practice a Similar Problem on Codemia
Solve a related problem with our interactive workspace, get AI feedback, and view detailed solutions.
Solve on CodemiaSample Answer
Requirements
Functional Requirements
- Search Functionality: Users must be able to perform geo-based searches across various data sources (e.g., financial data, market trends, client portfolios).
- **Aut...
Capacity Estimation
Back-of-Envelope Calculations
- User Base: Assume 100,000 active users.
- Search Requests: Assume each user performs 10 searches per day.
- Total Daily Search Requests: 100,000 users *...
Submit Your Answer
