Why requirements clarification is so important ?
Requirements Clarification
The end goal of requirements clarification is to get us to define both functional and non-functional requirements.
Functional - System Behavious
Non-Functional - System Quality [fast, fault tolerant]
Highly recommend to write down the requirements on the whiteborad. They will later on help us discuss the trade-offs and pros and cons.
Data Model
Which option should we choose ? Interviewer help needed. Ask him about delay.
If several hours is okay, store individual events else aggregate data fly. Batch data processing vs Stream data processing.