System Design | Rate Limiter | Pt 2 | High Level Design | Pt6 | Sliding Window Counter
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The sliding window counter algorithm is a type of rate limiting algorithm that is used to limit the rate of requests or events in a system. This algorithm maintains a counter for each time interval, and limits the rate of requests based on the total count of requests that have occurred within a sliding time window.
Here's how the sliding window counter algorithm works:
1. Divide time into fixed intervals of a certain duration, such as 1 second or 5 seconds.
2. Maintain a counter for each interval that counts the number of requests received within that interval.
3. Maintain a sliding window that covers a certain number of intervals, such as the last 60 seconds or 5 minutes.
4. When a request is received, add it to the counter for the current interval.
5. When the sliding window moves to the next interval, subtract the count for the oldest interval from the total count.
6. Check the total count of requests in the sliding window. If the count exceeds a predefined threshold, further requests are blocked or delayed until the count falls below the threshold.
Pros of sliding window counter algorithm:
Simple to implement and understand compared to sliding window log algorithms.
Provides more fine-grained control over the rate limit compared to fixed window algorithms.
Can handle bursts of traffic effectively.
Cons of sliding window counter algorithm:
Can be overly restrictive for traffic that occurs consistently over time.
Doesn't provide accurate limiting of the rate of requests or events over time compared to sliding window log algorithms.
Overall, the sliding window counter algorithm can be an effective way to limit the rate of requests or events in a system. It provides a more fine-grained control over the rate limit compared to fixed window algorithms, and can handle bursts of traffic effectively. However, it may not be as accurate in limiting the rate of requests or events over time compared to sliding window log algorithms. Careful consideration should be given to the specific needs and requirements of the system before choosing this algorithm.