XOVER ranges

Russ Allbery rra at stanford.edu
Fri Apr 4 17:32:11 UTC 2008

"Jeffrey M. Vinocur" <jeff at litech.org> writes:

> So does anybody have an opinion?  Say, if a client issues GROUP, and the
> high watermark is N, so it sends ARTICLE N.  Then it sits around for a
> while and more articles arrive.  (1) Should NEXT allow the current article 
> pointer to move past N to the new articles?  (2) Should XOVER 1- return 
> information on articles past N?
> I'm leaning towards "yes" at least for #2.
> RFC 3977 does not help much.  It warns clients that new articles may
> arrive on an ongoing basis, but doesn't specify the behavior in the
> above situations clearly.

You're allowed to do whatever you want from an RFC perspective.  It's a
lot cleaner in some respects to freeze the client understanding of the
group at the time you enter the group and have to leave and re-enter to
see new articles, and I think some clients already deal with this.
Otherwise, you probably want to periodically in nnrpd re-get group
statistics for the group to update the watermarks in nnrpd as well.

I'm not sure if showing articles with higher numbers than GROUP reported
will confuse some clients.

Russ Allbery (rra at stanford.edu)             <http://www.eyrie.org/~eagle/>

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