Design a Global Multi-Tenant Quota Service
Context
Design a global, multi-tenant quota service that manages a single storage quota per user across multiple upstream products (e.g., Drive, Photos). This service must operate at a global scale, supporting millions of daily active users and high QPS across various regions.
Functional Requirements
- Consume quota.
- Release quota.
- Optionally query current quota state.
Non-Functional Requirements
- Prevent Overdraft: The system must absolutely prevent overdrafts at all times.
- High Consistency: Maintain high consistency for quota states.
- High Availability: Ensure the service is highly available.
- Low Latency: Achieve low latency where possible.
- Scalability: Scale to support millions of daily active users and high QPS.
Design Considerations
Candidates should address the following aspects in their design:
- Define comprehensive APIs, including operations like
consume,reserve,confirm,release, andquery, ensuring idempotency. - Choose an appropriate storage solution and data model, justifying the ACID requirements.
- Describe the read and write paths, including replication and acknowledgment strategies to prevent double-spending.
- Address concurrency challenges across services and regions, and mitigate race conditions.
- Model various quota states (e.g., Available, Reserved with TTL, Occupied) and design mechanisms for timeouts and recovery.
- Decide on synchronous versus asynchronous processing for
consumeandreleaseoperations, along with failure handling and retry strategies. - Propose sharding strategies and a multi-region disaster recovery/failover plan.
- Evaluate the use of caching, ensuring consistency if implemented.
- Incorporate backpressure, rate limiting, and hot-key mitigation techniques.
- Outline monitoring, Service Level Objectives (SLOs), and capacity planning considerations.
AI interview prep
Core dilemma
Achieving strict global consistency to prevent overdrafts while maintaining high availability and low latency at massive scale across multiple regions.
3 tradeoffs and 3 stress tests locked
Interview prep
Unlock the interviewer X-Ray rubric, tradeoff matrix, stress tests, clarifying questions, and key concepts.
Design a Global Multi-Tenant Quota Service
Context
Design a global, multi-tenant quota service that manages a single storage quota per user across multiple upstream products (e.g., Drive, Photos). This service must operate at a global scale, supporting millions of daily active users and high QPS across various regions.
Functional Requirements
- Consume quota.
- Release quota.
- Optionally query current quota state.
Non-Functional Requirements
- Prevent Overdraft: The system must absolutely prevent overdrafts at all times.
- High Consistency: Maintain high consistency for quota states.
- High Availability: Ensure the service is highly available.
- Low Latency: Achieve low latency where possible.
- Scalability: Scale to support millions of daily active users and high QPS.
Design Considerations
Candidates should address the following aspects in their design:
- Define comprehensive APIs, including operations like
consume,reserve,confirm,release, andquery, ensuring idempotency. - Choose an appropriate storage solution and data model, justifying the ACID requirements.
- Describe the read and write paths, including replication and acknowledgment strategies to prevent double-spending.
- Address concurrency challenges across services and regions, and mitigate race conditions.
- Model various quota states (e.g., Available, Reserved with TTL, Occupied) and design mechanisms for timeouts and recovery.
- Decide on synchronous versus asynchronous processing for
consumeandreleaseoperations, along with failure handling and retry strategies. - Propose sharding strategies and a multi-region disaster recovery/failover plan.
- Evaluate the use of caching, ensuring consistency if implemented.
- Incorporate backpressure, rate limiting, and hot-key mitigation techniques.
- Outline monitoring, Service Level Objectives (SLOs), and capacity planning considerations.