That only works as long as there are just a handful of hot files. The moment multiple customers request hot files at the same time the cheaper Pi3 and Pi4 nodes will not have enough memory to keep all hot files in the cache. Worst case the download pattern lets them rotate through the files basically reading from disk all the time. By the time the second request for the same file comes in they have been forced to delete it from cache and have to read it from disk again. So the fact that hot file delivery works for a single customer doesn’t mean it also works in bigger scales with multiple customers CDN like.
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