[AusNOG] urlscan.io

[Damian Guppy]

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 <markzzzsmith at gmail.com> wrote:

> On 16 June 2017 at 16:35, Damian Guppy <the.damo at gmail.com> 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 <raphael.timothy at gmail.com>
> > 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 <markzzzsmith at gmail.com>
> wrote:
> >> >
> >> > On 16 June 2017 at 16:10, Scott Howard <scott at doc.net.au> wrote:
> >> >> On Thu, Jun 15, 2017 at 10:57 PM, Mark Smith <markzzzsmith at gmail.com
> >
> >> >> 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
> >> > _______________________________________________
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> >> > AusNOG at lists.ausnog.net
> >> > http://lists.ausnog.net/mailman/listinfo/ausnog
> >>
> >> _______________________________________________
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> >
> >
>
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