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Posted to notifications@dubbo.apache.org by GitBox <gi...@apache.org> on 2021/09/16 06:27:20 UTC

[GitHub] [dubbo] memory7734 commented on issue #8820: 为什么负载均衡负责使用ShortestResponseLoadBalance就避免了LeastActiveLoadBalance的缺点了呢？

memory7734 commented on issue #8820:
URL: https://github.com/apache/dubbo/issues/8820#issuecomment-920614875


   LeastActiveLoadBalance 在性能差异大的两台机器上是有问题的：假设在时间周期内每个请求耗时相同的情况下，两台机器可以处理的最大活跃数量分别为 200 和 1000，那有500个请求过来的时候，性能差的机器已经到达上限200时，不应该再分配额外的请求了。所以“活跃数越低，代表该提供者处理能力越强”，也就不成立了。
   如果使用ShortestResponseLoadBalance 其实是在比较 “排队时长” + “处理时长”，那性能好的机器“排队时长”是小的，会自动分配更多的调用


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