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sczyh30 avatar sczyh30 commented on May 10, 2024 2

Sentinel 指标统计的滑动窗口中每个小窗口的初始时间都是经过对齐的（间隔默认 500 ms），而不是当前时间，因此会存在时间偏差导致多通过的情况。

比如流量的时间范围（取后四位）：1258 - 2258

理想的情况是：

   瞬间20个请求            这段时间无法通过
       ↓                       ↓
   |    o               |                    |
 1258                  1758                 2258    (windowStart)

但实际的窗口是：

   瞬间20个请求            这段时间无法通过  第一个窗口过期，因此又可以进入 20 个
        ↓                       ↓              ↓
   |    o               |                    |  o                  |
 1000                  1500                 2000                 2500  (windowStart)

from sentinel.

xflonga avatar xflonga commented on May 10, 2024

感谢回答。

我理解了，然后今天看了下这一块的代码，sentinel是以500ms为一个时间监控窗口，所以我问题中所描述的2倍其实也不准确，只是因为我测试的时间少，使得增加的起始时间片段和结束时间片段的qps刚好和qps一样。。

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