Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!mcsun!sunic!kullmar!pkmab!ske
From: ske@pkmab.se (Kristoffer Eriksson)
Newsgroups: news.software.b
Subject: Re: cancel propagation
Message-ID: <1760@pkmab.se>
Date: 13 Sep 89 20:07:36 GMT
References: <5200@looking.on.ca> <536@logicon.arpa> <3246@deimos.cis.ksu.edu> <1989Aug30.174430.20687@anise.acc.com> <1989Aug31.034105.2177@utstat.uucp> <6233@looking.on.ca> <1989Sep6.214313.27685@utzoo.uucp>
Organization: Peridot Konsult i Mellansverige AB, Oerebro, Sweden
Lines: 20

In article <1989Sep6.214313.27685@utzoo.uucp> henry@utzoo.uucp (Henry Spencer) writes:
>Brad, you are assuming that the feed system is an acyclic graph composed
>entirely of well-behaved links. ...
>The real feed structure is *full* of loops, back doors,
>sneak paths, intermittent links, unidirectional links, partial feeds, and
>other perversions.

How about having a configurable option to not forward cancel messages for
messages that have not yet been received, that can be used by all the sites
that have only a single feed, and feed other sites for which it is also the
only feed? Such systems do exist, after all; my system is one. I have a single
feed using uucp on dial-up lines, which is quite expensive. Keeping the costs
down is of big concern to me. I'd do anything to reduce the number of messages
sent to me (or sent from me), however little effect it would have.

(The system I get my feed from also has a single feed.)
-- 
Kristoffer Eriksson, Peridot Konsult AB, Hagagatan 6, S-703 40 Oerebro, Sweden
Phone: +46 19-13 03 60  !  e-mail: ske@pkmab.se
Fax:   +46 19-11 51 03  !  or ...!{uunet,mcvax}!sunic.sunet.se!kullmar!pkmab!ske