Design Twitter News Feed
60 minsfeed-generationfan-outcaching Functional Requirements
- •Users can post tweets (up to 280 chars)
- •Users can follow/unfollow other users
- •User's home timeline shows tweets from people they follow
- •Tweets can have likes, retweets
Non-Functional Requirements
- •Timeline should load quickly (< 200ms)
- •Highly available
- •Eventual consistency acceptable
Scale
- •100M daily active users
- •50M tweets per day
- •600K tweets per second (peak read)
- •300x more reads than writes
Functional Requirements
- •Users can post tweets (up to 280 chars)
- •Users can follow/unfollow other users
- •User's home timeline shows tweets from people they follow
- •Tweets can have likes, retweets
Non-Functional Requirements
- •Timeline should load quickly (< 200ms)
- •Highly available
- •Eventual consistency acceptable
Scale
- •100M daily active users
- •50M tweets per day
- •600K tweets per second (peak read)
- •300x more reads than writes
