Cloudflare changes the dynamics of updates. I wonder if it
be better if everyone pointed to db.clamav.net and
mirrors are dropped. Let Cloudflare decide what is the
POP, that's kinda their job.
Regardless of where you are pointed, this is what is happening. Effectively, everyone in the world is pointed at three mirrors. Ours.
Cloudflare is caching the files once they are downloaded the first time, and you get them from cloudflare. The first time someone requests a new file, each Cloudflare node fetches it from our server, then everyone else that requests that file,
gets it from cloudflare. It results in about 80GB to our servers every update... but once all the Cloudflare pops have the files, there are no more requests that hit our server for that file. (Unless I flush the cache or something).
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