Daily Active Users for Twitter Design (Back of envelope calculation)


I have a question here. Why did you consider 250 M users for storage requirements and 500 M users for server requirements?
Why these numbers are not the same for both?

Thanks & Regards,

Course: Grokking Modern System Design Interview for Engineers & Managers - Learn Interactively
Lesson: Examples of Resource Estimation

Hi Ashish.

We are glad that you reached out to us. These numbers are just exemplary numbers we used to calculate resource estimates. The calculations would work the same if we had 250M instead of 500M DAU.

We are working on a revamp of this lesson, in which we have used 500M for all the calculations. We will update you once it is done. We apologize for any inconvenience caused.

If you have any further queries, feel free to reach out to us.

Thank you.