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System Design Question

Design a Video View Count System

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Functional Requirements

  1. Accurate Count Tracking

    • The system should accurately track the number of views for each video.
    • Ensure that repeated views by the same user within a short period are not counted multiple times.
    • Support real-time updates to reflect the current view count.
  2. Scalability

    • Handle a large number of concurrent viewers and video uploads.
    • Support a growing number of videos and users over time.
  3. Consistency

    • Ensure that view counts are consistent across different platforms and devices.
    • Provide eventual consistency for view count updates.
  4. Analytics and Reporting

    • Provide APIs or interfaces for retrieving view count data.
    • Support aggregation of view data for analytics purposes.
  5. Security

    • Prevent fraudulent activities such as view count manipulation.
    • Implement rate limiting and IP tracking to detect suspicious activities.
  6. User Notifications

    • Notify video owners of significant milestones in view counts (e.g., 1000 views).
  7. Localization

    • Support view count tracking across different geographical regions.

Non-Functional Requirements

  1. Performance

    • The system should update and retrieve view counts with minimal latency.
    • Ensure low response times for API calls related to view counts.
  2. Reliability

    • The system should be highly available, with minimal downtime.
    • Implement redundancy and failover mechanisms to ensure continuous operation.
  3. Scalability

    • Design the system to handle peak loads efficiently.
    • Support horizontal scaling to accommodate increased traffic.
  4. Data Durability

    • Ensure that view count data is safely stored and not lost in case of failures.
    • Implement regular backups and data recovery mechanisms.
  5. Latency

    • Aim for sub-second latency for view count updates and retrievals.
  6. Capacity

    • Plan for storage and processing capacity to handle billions of views.
  7. Security

    • Protect against unauthorized access to view count data.
    • Ensure data integrity and confidentiality.
  8. Monitoring and Logging

    • Implement logging for view count updates and access.
    • Set up monitoring to detect anomalies and performance issues.

System Design Diagrams

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