If all Rate Limiting algorithms solve the same problem...
Why do we need 5 different ones?
After studying them one by one, I realized the answer isn't about finding the "best" algorithm.
It's about understanding trade-offs.
Here's a simple breakdown๐
This thread is a quick revision of all 5 algorithms.
I've already shared detailed threads on each one with diagrams and visualizations.
If you want to understand any algorithm in depth check out the previous posts on my profile.
Formula
Estimated Count =
(Previous Count ร Remaining %)
+ Current Count
- Prevents burst traffic
- More accurate than Fixed Window
- Efficient & scalable
#SystemDesign#Backend#RateLimiting
Learning Sliding Window Counter Algorithm
Instead of resetting requests every fixed interval it uses a rolling time window for more accurate and fair rate limiting.
I created a short animation explaining the Sliding Window Log Algorithm.
Before explaining it, I first covered why the Fixed Window Counter isn't always the best choice.
Cons:
โข Stores every request timestamp
โข Higher memory usage
โข Slightly slower because old timestamps must be removed
โข Doesn't scale as well for very high traffic compared to Token Bucket or Sliding Window Counter