seniorPHP
Explain advanced API gateway rate limiting and distributed quota enforcement systems.
Updated May 24, 2026
Short answer
Rate limiting controls request frequency using distributed counters and token-based algorithms to protect system stability.
Deep explanation
Rate limiting prevents abuse and ensures fair resource usage.
Algorithms:
- Token bucket
Tokens refill over time.
- Leaky bucket
Smooths traffic flow.
- Fixed window counter
Simple but burst-prone.
- Sliding window log
Accurate but expensive.
- Sliding window counter
Approximation of log method.
Distributed enforcement:
- Redis counters
- consistent hashing of users
- global quota coordination
Challenges:
- clock synchronization
- distributed counter consistency
- burst handling
- fairness across regions…
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