[ietf-nntp] Decreasing low water mark
Clive D.W. Feather
clive at demon.net
Thu Dec 18 03:30:48 PST 2003
In 6.1.1.2 we write:
Except when the group is empty and all three numbers are zero, whenever
a subsequent GROUP command for the same newsgroup is issued, either by
the same client or a different client, the reported low water mark in
the response MUST be no less than that in any previous response for
that newsgroup sent to any client.
In a cluster system where each server does its own expiry, it is possible
that one server may expire earlier than another. Thus we see something
like:
[Connection to cluster]
[S] 200 Welcome to server 1, last expiry 03:00
[C] GROUP misc.test
[S] 211 10 1011 1020 misc.test
[C] QUIT
[S] 205
[Connection ends]
[Connection to cluster]
[S] 200 Welcome to server 2, last expiry 01:00
[C] GROUP misc.test
[S] 211 12 1000 1020 misc.test
[C] QUIT
[S] 205
[Connection ends]
which breaks the requirement.
Russ's suggestion was to change the MUST to a SHOULD. I feel that we need
to say something about the times this is broken, but I can't offhand think
what.
--
Clive D.W. Feather | Work: <clive at demon.net> | Tel: +44 20 8495 6138
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