Terminology in this context:
replication = making a copy of the source object
caching = capturing and replaying the server response
Both have the effect of creating a new point of service (surrogate).
/micah
----- Original Message -----
From: "Alexei Novikov" <anovikov@heron.itep.ru>
To: "Jean-Sylvestre Gakwaya" <jean-sylvestre.gakwaya@alcatel.be>; "WREC
Working Group" <wrec@cs.utk.edu>
Sent: Wednesday, September 20, 2000 6:48 AM
Subject: Re: question about caching and replication
> Jean-Sylvestre Gakwaya wrote:
> >
> > Hello all,
> >
> > I am a newbie in caching stuff :O) I have a very simplicist question :OS
> > What is the relationship between replication and caching? I mean that to
> > elaborate a caching mesh, or when a document is stale, problem of
replication
> > comes ... so, is there any protocol about interaction between both kind
of
> > protocols: caching and replication?
> >
> > Thanks in advance,
>
> Actually you can integrate replica (WWW or FTP mirror) in the caching
> mesh. It can be done quite easily with writing:
> 1) ICP daemon that will provide HITs or MISSes based on the knowledge of
> the replicated content.
> 2) Tool to create cachedigest file (for better scalability of the
> communications with the cachedigest enabled caches)
> 3) Module for the web server that will respond to the proxy requests
> with internal redirects to the replicated content.
>
> You can do this using Martin Hamilton's Perl modules WebCache:ICP and
> WebCache:Digest and <100 lines perl script for the Apache Web server.
>
> The good thing is that one can create such replicas with the
> authorization of the content provider (and under supervision), the bad
> is that ICP is poorly scalable.
>
> Alexei.
>
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