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The Framework proposed in this space (Alex Xu) is applied to propose a design : Getting started - a framework to propose... |
Introduction
News feed is the constantly updating list of stories in the middle of the home page. It includes status updates, photos, links, video, etc
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Part 1 - Understand the problem and establish design scope
Accessible via Mobile App or/and Web App ? | Both |
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Features ? | Publish and See other posts (from other users) |
How is sorted the news feed ? | Reverse chronological order |
How many friends user can have ? | 5000 |
Traffic volume ? | 10 million per day, active users |
Contain images, videos or just text ? | All. |
Part 2 - High-Level design
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2 flows :
Feed publishing → user publishes a post, corresponding data is written into cache and DB.
Newsfeed building → news feed is built by aggregating friends’ posts in
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reverse chronological order.
Part 3 - Deep dive design
Flow Feed Publishing
Focus is on Web servers and the fanout service.
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Flow Newsfeed Retrieval
Focus is on the CDN and the News Feed Service :
Service fetches complete user and post objects from caches.
News feed is returned in JSON format back to the client for rendering.
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Part 4 - Pros & Cons
Need to validate how to scale the DB (Master-Slave replication, Read Replicas, DB Sharding, etc.)
How to keep Web Tier Stateless
etc…