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Path: utzoo!linus!decvax!harpo!eagle!mhuxi!mhuxj!mhuxl!mhuxm!pyuxi!u1100a!sdo
From: sdo@u1100a.UUCP
Newsgroups: net.news
Subject: Re: Deja vous???
Message-ID: <375@u1100a.UUCP>
Date: Tue, 4-Oct-83 13:47:41 EDT
Article-I.D.: u1100a.375
Posted: Tue Oct  4 13:47:41 1983
Date-Received: Fri, 7-Oct-83 01:03:47 EDT
References: umcp-cs.2913
Lines: 23

I think I can shed some light on the reappearance of articles weeks
after they first appear.  As we all know, articles get dropped
now and then.  Some connections are worse than others.  We have
a set of shell procedures which allow a history file to be compared
against a master history file, and the missing news items transferred
and posted on the system with the missing articles.

I believe this was done using our history file as the master.
The other site doesn't have a news link with us.
The other site then posted all the transferred articles.  Since
we are not in its sys file, the articles were re-sent out over
the standard news links.  Any articles near their expiration
date probably expired by the time far away machines received them.

All this probably only accounts for a few duplicates.  I'm sure
there are many other ways for dups to appear, including the
famous runaway notesfiles occurrences.  If you don't see abnjh!u1100a
in the news path, then it's not this problem.

			Scott Orshan
			Bell Labs Piscataway
			201-981-3064
			{pyuxi,houxm,ihnp4}!u1100a!sdo