If the cache replacement policy does not reflect the request model, the cache server will not be able to receive a high request hit rate.
如果缓存中的替换策略不能反映业务的访问模式,那么缓存服务器就不能得到高的请求命中率。
参考来源 - CDN缓存替换机制的研究与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
由于您只访问了一次Portlet，并且已具有一个“缓存未命中率”；因此，已在此时将片段填充到缓存，该缓存可以针对任何将来的请求提供服务。
Because you have accessed the portlet only once, you had a "cache miss"; therefore, the cache was then filled with the fragment and is ready to serve any future requests.
缓存的有效性与命中率成正比关系，命中率是缓存中的项能满足请求的比例。
The effectiveness of the cache is directly proportional to the hit ratio, which is the percentage of requests satisfied by having the item in the cache.
同时，在集群分发过程中应用该算法，可提高请求的调度效率和节点的缓存命中率。
Meanwhile, applying the algorithm to the process of dispatching can improve the scheduling efficiency of requests and cache hit ratio of nodes.
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