p2p summary (kind of)

Joe Armstrong <>
Thu Feb 14 12:19:36 CET 2002


On Thursday 14 February 2002 11:36 am, Vlad Dumitrescu wrote:
> ><ranting mode on>
> >
> :-) nice to see someone really feeling for an issue!
> :
> >No the existing ones are crap :-) - Gutella is like wandering into a
> > random room in a random town in a random country and shouting at a random
> > group of passers by "has anybody got a fish"
>
> TRUE! but for only 20 peers, it works fine!
>
> >I've been thinking about the "discovery protocol" for some time - and
> >the answer is ..... "Dewey"
>
> Doesn't that cost money? I'm not even sure if they have a licensing
> programme yet (but I suppose the interest exists).
>

I don't know I hope not :-(

> >How do you find info in the p2p system - by *carefully* probing the peer
> >group and asking the right questions - by building catalogues and
> >maintaining trust neworks (do I believe this information)
>
> Absolutely!!!
>
> >JXTR says "Info is keyed by ten zillion bit (random) globally unique
> >identifiers."
>
> And Dewey says "Info is keyed by ten milion decimal digit hierarchical
> identifiers". Is it such a big difference?
>

Yes - an incredable difference. Dewey category code has a *meaning*
470 is "Italic Languages. Latin" - librarians spend their entire life 
figureing out what code to give a particular thing.

The GUID is a random string.

> >But that *basicaly* is what JXTR is (at the most primitive level) - with
> >not even a hint as to HOW you go about finding the meading of the GUIDs.
>
> The advantage of UUIDs is that you can have one for exactly YOUR red Volvo
> S40 car's driving wheel, or something. Using Dewey, you can at most get a
> reference to any driving wheel, and link it to a reference to Volvos and to
> yourself as the owner...
>
> >No my infrastruce will use the dewey decimal system - and I will keep data
> >bases of who knows what and how reliable the information is
>
> Personally I think it is an internal matter. Applications should not have
> to see those identifiers at all. A naming service should take care of that,
> in either case. A DNS for the universe, maybe? :-)

IMHO the naming service is cenral and integral to the p2p system not outside 
it.


>
> >That feels better :-)
>
> Good!
>
> >Erlang is a programing language - PLs don't scale up!
>
> I meant the Erlang distribution mechanism. Is it correct now?
>
> >I am building such an infrastructure NOW - hope to post by end of next
> > week
>
> Looking forward to it! I will start with more concrete stuff myself too.
>
> > > -- routing and gatewaying: ...
> >
> >Smile :-) - we gould you segiography and communicate with gifs of yellow
> >bananas on port 80 :-)
> >
> :-) No, but send the erlang messages over http as binary/octet-stream, if
>
> the receiver is behind a firewall.
>
> >No not at all - I babble with you - I plan to register a new domain name
> >and host a myp2p.org (or whatever) at SICS with an Erlang P2p
> >infracstructre real soon -
>
> Wonderful!
>
> regards,
> Vlad
>
> _________________________________________________________________
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