Read my second paragraph again.
On 16 June 2017 at 17:10, Damian Guppy <[email protected]> wrote: > Then you should know what happens to a reverse proxy when you have a cache > miss, the request doesn't fail, it just gets transparently proxied off to > the upstream server that does have the content. > > --Damian > > On Fri, Jun 16, 2017 at 3:07 PM, Mark Smith <[email protected]> wrote: >> >> On 16 June 2017 at 16:35, Damian Guppy <[email protected]> wrote: >> > Akamai is a caching network. DNS does not provide the sort of >> > intelligence >> > necessary to direct requests to the most appropriate server, so you will >> > always just hit the server closest to you. If that server happens to >> > have >> > the content already cached then it will serve it up itself. If it >> > doesn't >> > have some or all of the content required (cache miss) the server will >> > act as >> > a proxy and fetch the content from the closest upstream server on the >> > akamai >> > network that does have the content, and then hold onto it for an amount >> > of >> > time as defined by their internal algorithms in case anyone else needs >> > that >> > content. >> > >> > *this is a simplified explanation of what is a complex system* >> >> You might want to look up the the expression "Teaching grandmother to >> suck eggs". >> >> I've worked on the assumption that CDNs, given the amount of storage >> that CDN nodes have (I've seen a few in person), and that ISPs have >> had their own translucent web proxies in the past, have content >> proactively replicated to them so that there is no latency, even for >> the first request. >> >> > >> > Thanks >> > --Damian >> > >> > On Fri, Jun 16, 2017 at 2:29 PM, Tim Raphael <[email protected]> >> > wrote: >> >> >> >> Mark, >> >> >> >> You’ll find that Akamai’s algorithms will retrieve the content from the >> >> origin and keep it at varying stages of “warm” in their caches based on >> >> demand. >> >> >> >> I’d be pretty unimpressed if I was a US / EU journo trying to get >> >> Australian news from a webpage 500+ms RT away. >> >> >> >> - Tim >> >> >> >> >> >> > On 16 Jun 2017, at 4:25 pm, Mark Smith <[email protected]> >> >> > wrote: >> >> > >> >> > On 16 June 2017 at 16:10, Scott Howard <[email protected]> wrote: >> >> >> On Thu, Jun 15, 2017 at 10:57 PM, Mark Smith >> >> >> <[email protected]> >> >> >> wrote: >> >> >>> >> >> >>> I think an interesting example is www.theage.com.au. You would >> >> >>> expect >> >> >>> the main site to be hosted somewhere inside Australia, yet it is >> >> >>> being >> >> >>> hosted by Akamai somewhere in Europe. >> >> >> >> >> >> >> >> >> Want to think about that comment a little more? >> >> >> >> >> > >> >> > Not really, didn't think much about it before. >> >> > >> >> > Perhaps it it is surprising that Akamai are hosting copies of content >> >> > a long way away from where it is going to be popularly read. There >> >> > can't be that many readers of The Age in Europe. >> >> > >> >> > I don't know anything about Akamai's service optons, and whether >> >> > customers can choose where their content is held or provide an >> >> > indication of where the content is most likely consumed. >> >> > >> >> > If not, it might indicate Akamai's replication strategy could be copy >> >> > everything everywhere or perhaps at least one copy in each continent. >> >> > Cheap enough to do in terms of storage and network bandwidth, just a >> >> > bit of a surprise it isn't more optimal. >> >> > >> >> >> Where do you think urlscan.io is hosted? How does Akamai work? >> >> >> >> >> >> Scott >> >> > _______________________________________________ >> >> > AusNOG mailing list >> >> > [email protected] >> >> > http://lists.ausnog.net/mailman/listinfo/ausnog >> >> >> >> _______________________________________________ >> >> AusNOG mailing list >> >> [email protected] >> >> http://lists.ausnog.net/mailman/listinfo/ausnog >> > >> > > > _______________________________________________ AusNOG mailing list [email protected] http://lists.ausnog.net/mailman/listinfo/ausnog
