Design Task Scheduling Infrastructure for real-time analytics
Last updated: July 25, 2025
Quick Overview
Design a distributed task scheduling system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Amazon
July 25, 2025147
9
2,092 solved
Design a distributed task scheduling system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
System design interviews at Amazon 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
- Clearly define functional and non-functional requirements
- Propose a reasonable high-level architecture with core components
- Choose appropriate data storage solutions with basic justification
- Discuss basic scaling strategies (horizontal scaling, caching)
- Identify potential bottlenecks and suggest simple solutions
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 optimize costs as the system scales?
- How would you handle schema migrations with zero downtime?
- How would you handle a region-wide outage?
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Requirements
Functional Requirements
- Task Creation: Users must be able to submit tasks with specific parameters, including task type, priority, and execution time.
- Task Scheduling: The system mus...
Capacity Estimation
Assuming we are handling 1 million tasks per minute:
- Total Tasks Per Second: 1,000,000 / 60 ≈ 16,667 tasks/second.
- Task Execution Time: Assuming an average task execution time of 100ms, ea...
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