News Feed Search

Functional Requirement

1. User can search relevant news feed.

2. User's news feed post can get indexed.

Non-functional requirement

1. Highly available

2. Low latency

3. Availability > Consistency

Scale

3M DAU = 3*10^6 / 10^6 = 3 QPS = 30 QPS

API

/v1/search?keyword=xxx

Data Schema

Elastic Search + MySQL

High Level Design