From: Timothy Miller <miller@techsource.com>
To: Andrea Arcangeli <andrea@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Davide Libenzi <davidel@xmailserver.org>,
Larry McVoy <lm@bitmover.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: kernel.bkbits.net off the air
Date: Tue, 11 Nov 2003 10:26:28 -0500 [thread overview]
Message-ID: <3FB0FFA4.3060107@techsource.com> (raw)
In-Reply-To: 20031110234108.GG6834@x30.random
Please pardon my late intrusion into this discussion of what appears to
be CVS mirror coherency. The impression I get, which may be wrong, is
that one or both of these problems is happening:
- A user is pulling from one CVS mirror, but that mirror is in the
process of being updated from the BK source, so the user gets some new
files and some old ones.
- A user is pulling from more than one CVS mirror at the same time, and
not all mirrors are at the same revision level.
Either way, and I would not be surprised if someone else had suggested
this already, but being a graphics person, let me suggest a common
technique for dealing with this problem: double-buffering.
Let's assume a combination of the two above cases, because the general
solution applies to all cases.
To begin with, all mirrors serve from the "front buffer", all of which
are known to be at the same revision level for all files. While serving
the front buffers, the "back buffers" are being updated.
At a prescribed time, all servers go off-line (to deal with
asynchronicity between clocks), swap the front and back buffers, and
then go back online.
The synchronization problem can be dealt with either by having everyone
have their clocks set relatively close but go offline for a few seconds
just in case there is some drift, or there can be a master server which
signals the others when to swap buffers.
next prev parent reply other threads:[~2003-11-11 15:17 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-07 5:10 kernel.bkbits.net off the air Larry McVoy
2003-11-07 9:53 ` Clemens Schwaighofer
2003-11-09 15:16 ` H. Peter Anvin
2003-11-09 15:25 ` Larry McVoy
2003-11-09 15:42 ` Davide Libenzi
2003-11-09 16:25 ` Larry McVoy
2003-11-10 1:21 ` Davide Libenzi
2003-11-10 13:26 ` Andrea Arcangeli
2003-11-10 16:49 ` Davide Libenzi
2003-11-10 16:57 ` Andrea Arcangeli
2003-11-10 17:54 ` Davide Libenzi
2003-11-10 17:59 ` H. Peter Anvin
2003-11-10 18:27 ` Davide Libenzi
2003-11-10 18:37 ` Andrea Arcangeli
2003-11-10 18:52 ` Davide Libenzi
2003-11-10 19:08 ` H. Peter Anvin
2003-11-10 19:23 ` Davide Libenzi
2003-11-10 19:31 ` Andrea Arcangeli
2003-11-10 19:42 ` H. Peter Anvin
2003-11-10 23:41 ` Andrea Arcangeli
2003-11-11 15:26 ` Timothy Miller [this message]
2003-11-11 3:10 ` Davide Libenzi
2003-11-11 3:25 ` H. Peter Anvin
2003-11-11 3:48 ` jw schultz
2003-11-11 4:03 ` Davide Libenzi
2003-11-11 7:34 ` Davide Libenzi
2003-11-11 15:00 ` Andrea Arcangeli
2003-11-14 5:13 ` Andrew Pimlott
2003-11-14 14:01 ` Andrea Arcangeli
2003-11-14 14:53 ` Larry McVoy
2003-11-14 15:28 ` Andrea Arcangeli
2003-11-14 18:20 ` H. Peter Anvin
2003-11-10 18:37 ` David Roundy
2003-11-10 18:46 ` Andreas Dilger
2003-11-09 19:28 ` H. Peter Anvin
2003-11-10 1:59 ` Matt Mackall
2003-11-10 2:38 ` H. Peter Anvin
[not found] <fa.na6uip6.p2erhm@ifi.uio.no>
[not found] ` <fa.dbkbts9.1k7ohhd@ifi.uio.no>
2003-11-11 4:00 ` walt
2003-11-11 7:22 ` Davide Libenzi
2003-11-11 7:37 ` Nick Piggin
2003-11-11 7:47 ` Davide Libenzi
2003-11-11 15:04 ` Andrea Arcangeli
2003-11-12 21:35 ` Benoit Poulot-Cazajous
2003-11-13 14:53 ` Andrea Arcangeli
2003-11-13 15:23 ` Andreas Schwab
2003-11-13 16:09 ` Andrea Arcangeli
2003-11-13 16:29 ` Larry McVoy
2003-11-13 16:39 ` Andrea Arcangeli
2003-11-13 22:09 ` Benoit Poulot-Cazajous
2003-11-11 15:02 ` Andrea Arcangeli
[not found] <fa.eto0cvm.1v20528@ifi.uio.no>
[not found] ` <fa.onl48uv.1tmeb21@ifi.uio.no>
2003-11-11 14:14 ` walt
2003-11-11 14:38 ` Andrew Walrond
2003-11-11 15:05 ` Andrea Arcangeli
2003-11-11 19:43 ` H. Peter Anvin
2003-11-11 20:21 ` Andrew Walrond
2003-11-11 20:38 ` Davide Libenzi
2003-11-11 23:52 ` Larry McVoy
2003-11-12 0:19 ` Andrea Arcangeli
2003-11-13 10:10 ` Andrew Walrond
2003-11-13 16:27 ` Larry McVoy
2003-11-13 16:43 ` Mark Mielke
2003-11-13 17:14 ` Davide Libenzi
2003-11-13 17:20 ` Larry McVoy
2003-11-14 3:01 ` Davide Libenzi
2003-11-13 18:21 ` Tupshin Harper
2003-11-14 7:14 ` Jan-Benedict Glaw
2003-11-14 9:48 ` Tupshin Harper
2003-11-14 9:56 ` Geert Uytterhoeven
2003-11-14 21:51 ` Jan-Benedict Glaw
2003-11-14 22:55 ` Roman Zippel
2003-11-13 19:17 ` Andrew Walrond
2003-11-13 19:28 ` Larry McVoy
2003-11-13 20:57 ` Andrew Walrond
2003-11-13 21:17 ` Sam Ravnborg
2003-11-14 14:54 ` Larry McVoy
2003-11-14 15:00 ` Larry McVoy
2003-11-14 16:24 ` Andrew Walrond
2003-11-14 16:46 ` Larry McVoy
2003-11-14 17:34 ` Andrew Walrond
2003-11-14 17:43 ` Larry McVoy
2003-11-14 18:17 ` Andrew Walrond
2003-11-16 5:12 ` Sven Dowideit
2003-11-18 15:30 ` Larry McVoy
2003-11-18 18:30 ` Ben Collins
2003-11-18 18:42 ` Larry McVoy
2003-11-18 22:53 ` Sven Dowideit
2003-11-19 0:24 ` Andrew Walrond
2003-11-19 0:38 ` Daniel Jacobowitz
2003-11-19 10:26 ` Andrew Walrond
2003-11-19 0:49 ` Larry McVoy
2003-11-19 10:45 ` Andrew Walrond
2003-11-18 18:42 ` Timothy Miller
2003-11-14 16:35 ` Davide Libenzi
2003-11-14 16:48 ` Larry McVoy
2003-11-14 17:03 ` Davide Libenzi
2003-11-14 17:04 ` Larry McVoy
2003-11-14 17:08 ` Davide Libenzi
2003-11-14 17:10 ` Larry McVoy
2003-11-16 4:57 ` H. Peter Anvin
2003-11-13 21:54 ` Eli Carter
2003-11-13 23:32 ` Daniel Egger
2003-11-14 9:56 ` Nick Piggin
2003-11-14 11:38 ` Daniel Egger
2003-11-15 3:02 ` Nick Piggin
2003-11-15 3:22 ` Linus Torvalds
2003-11-15 3:41 ` Davide Libenzi
2003-11-15 3:49 ` Linus Torvalds
2003-11-15 4:04 ` Davide Libenzi
2003-11-15 21:09 ` Daniel Egger
2003-11-18 9:59 ` Pavel Machek
2003-11-18 15:01 ` Larry McVoy
2003-11-13 0:45 ` Ryan Anderson
2003-11-13 12:59 Samium Gromoff
2003-11-13 14:44 ` Jan Harkes
2003-11-15 1:06 Carl-Daniel Hailfinger
2003-11-15 1:09 ` H. Peter Anvin
2003-11-15 10:53 ` Frank Cusack
[not found] <fa.gj5f2rq.1u42v9u@ifi.uio.no>
[not found] ` <fa.d7qik9h.1q644ip@ifi.uio.no>
2003-11-17 0:49 ` walt
[not found] <QHxm.193.21@gated-at.bofh.it>
[not found] ` <ROZW.3X0.17@gated-at.bofh.it>
[not found] ` <RPt5.4TS.9@gated-at.bofh.it>
[not found] ` <RQ5t.69U.7@gated-at.bofh.it>
[not found] ` <RQf8.6tb.9@gated-at.bofh.it>
[not found] ` <Snut.2iY.7@gated-at.bofh.it>
[not found] ` <Tg7E.7ST.11@gated-at.bofh.it>
[not found] ` <TiVJ.4ko.11@gated-at.bofh.it>
[not found] ` <Tj5w.4yi.25@gated-at.bofh.it>
2003-11-18 19:38 ` Pascal Schmidt
2003-11-19 14:49 ` Larry McVoy
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