Design quota enforcement for high concurrency

Q: Design quota enforcement for high concurrency

This question evaluates a candidate's understanding of distributed system design and engineering competencies related to quota enforcement, high-throughput rate limiting, consistency models, sharding, and concurrency control under very high QPS.

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Question

System Design: Quota Enforcement Service at Very High QPS

Context

You are designing a multi-tenant quota and rate-limiting service used by many backend services to enforce API call quotas (per second/minute) and capacity quotas (e.g., daily calls, storage bytes). The service must operate at very high request rates and across multiple regions.

Requirements

Design the service and:

Define the public APIs to check and increment usage under load.
Discuss strategies for strong consistency versus eventual consistency.
Explain how to handle hot-key sharding to avoid hotspots.
Describe rate-limiting algorithms and correctness under concurrent requests.
Explain how to reconcile temporary overage under eventual consistency for billing.
Describe how to ensure low-latency and high-availability enforcement.

Design quota enforcement for high concurrency

System Design: Quota Enforcement Service at Very High QPS

Context

Requirements

Solution

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Design quota enforcement for high concurrency

Overview

System Design: Quota Enforcement Service at Very High QPS

Context

Requirements

Solution

Comments (0)