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0.5x
1x
1.5x
2x
Fanout-on-Write — pre-compute feeds at write time
Followers
1000
Cache Writes
0
Twitter Feed Architecture
Writer
API Gateway
Tweet Service
Tweet DB
Fanout Service
Feed Cache A
Feed Cache B
Feed Cache C
Reader
Fanout Strategy
Fanout-on-Write
Fanout-on-Read
Hybrid
Post Tweet
Read Feed
Celebrity Tweets (50M followers)
Hybrid Fix
Challenges
3