Requirements of YouTube's Design


Let’s start with the requirements for designing a system like YouTube.

Functional requirements

We require that our system is able to perform the following functions:

  1. Stream videos
  2. Upload videos
  3. Search videos according to titles
  4. Like and dislike videos
  5. Add comments to videos
  6. View thumbnails

Non-functional requirements

It’s important that our system also meets the following requirements:

  • High availability: The system should be highly available. High availability requires a good percentage of uptime. Generally, an uptime of 99% and above is considered good.
  • Scalability: As the number of users grows, these issues should not become bottlenecks: storage for uploading content, the bandwidth required for simultaneous viewing, and the number of concurrent user requests should not overwhelm our application/web server.
  • Good performance: A smooth streaming experience leads to better performance overall.
  • Reliability: Content uploaded to the system should not be lost or damaged.

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