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Design a rate limiter - Coggle Diagram
Design a rate limiter
Step 3:
Design Deep Dive
Distributed environment
Synchronization issue
Race conditions
Performance
Rate limiting rule
How are rate limiting rules created?
Where are the rules stored?
Rate limiting handle
Rate limited header
X-Ratelimit-Remainning
X-Ratelimit-Limit
X-Ratelimit-Retry-After
HTTP Status code 429
How to handle the requests that are rate limited?
Design Details
Monitoring
Step 2:
Propose high-level design
and get buy-in
Where to put a rate limiter?
Server-side
Middleware
HTTP Status code: 429
Microservices
Client-side
Algorithms
Token bucket
Fixed window counter
Leaking bucket
Sliding windows log
Sliding windows counter
High level architecture
Where shall we store counter?
Database (Slow)
In-memory (Fast)
Redis
INCR
EXPIRE
Step 4:
Wrap up
Hard vs soft rate limiting
Rate limiiting at different levels
Design client
Step 1:
Understand problem
and establish design scope