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Design Instagram:

Design

instagram

Functional Requirements:

  1. User should be able to access the app on Mobile and Website

  2. Only English

  3. User should be able to access a feed of pictures a. User should see pictures from the pages followed b. There should be extra recommended or spondered posts

  4. Order of the posts. Assume sported by time (latest)

  5. User should be able to post pictures or videos

  6. user should be able to like and comment

  7. Search

How many users? Scale to 500M users

Post once a day on average. 60 million pictures posted per day 35 million videos uploaded per day

Reading 20 requests per day

Some accounts are going to be large and some small

On premise

Non-Functional Requirements:

  1. Scalability
  2. Availability and Fault Tolerance 99.9999
  3. Elasticity and performance

Latency - Performance.

Consistency - Eventual 1 hour consistency

Back of the Envelope Estimations:

Data Design

1 picture. 10kb 1 video. 1mb

60M * 10kb = 10gb * 60 = 600 GB per day pictures 35M * 1mb = 35 TB per day of videos

20 request per day per user:

20 * 500M = 10B content per day

100KB * 10B per day / 10 ^5 = 100Kb * 1M = 100GB per second

Data Storage

Users

  • id
  • name
  • description

Followers

  • followerid
  • followedid

Content -id -type(video or picture) -createddate

Feed Data

  • userid
  • ListOfContentId

Comments

  • id
  • contentid
  • userid
  • commentText
  • datetime

Likes

  • id
  • contentid
  • userid
  • datetime

Videos -id -desctition -size -datecreated

Pictures -id -desctition -size -date

Feed Data

  • userid
  • ListOfContentId

Comments

  • id
  • contentid
  • userid
  • commentText
  • datetime

Likes

  • id
  • contentid
  • userid
  • datetime

POST /uploadVideo VideoId VideDesctiption

if Success

  1. POST /uploadVideoData BINARY OF THE VIDEO Response

Tell the user if success or failure

https://excalidraw.com/#room=7df977a70821966fce9d,GMBCEhLebt5SLCR-OlVqFg

Latency Steam processor... tight processing...