advanced · capacity
Sizing for Black Friday
How many instances do we need for a traffic event four weeks from now?
Practical scenario
The service currently runs 12 instances at about 35% CPU with 800 req/s average. Marketing expects a four-hour event with roughly 6× normal traffic.
What it tests
- • Whether the candidate derives from measurements rather than guessing
- • Understanding of headroom and the queueing curve
- • Whether assumptions are stated explicitly