System Design

Question 2

Rate Limiter Sliding window counters

Answer 2

• The entire window time is broken down into smaller buckets. The size of each bucket depends on how much elasticity is allowed for the rate limiter
• Each bucket stores the request count corresponding to the bucket range.
  For example, in order to build a rate limiter of 100 req/hr, say a bucket size of 20 mins is chosen, then there are 3 buckets in the unit time

Question 3

Framework for system design?

Answer 3

https://www.youtube.com/watch?v=i7twT3x5yv8&ab_channel=ByteByteGo
Step 1: Understand the problem and establish design scope 5 Minutes Functional no-functional
Step 2: Propose high-level design and get buy-in 20 Minutes API and why(REst), high-level Design data MOdel
Step 3: Design a deep dive for 15 Minutes Disscus high-level and detail trade-off
3-1 Identify bottlenecks and scaling opportunities, try concerned edge cases
Step 4: Wrap up 5 Minutes Summarize

Question 4

Non-functional requirements:

Answer 4

Storage size
Number of users
Security
Consistency
Freshness
Accuracy
Performance
Scale
reliability

Question 5

Functional questions

Answer 5

Who are our clients?
Do we need to talk to pieces of the existing systems?
What are the existing pieces?