duplicate messages?

Anyone else getting duplicate messages?

Yep, have been getting them sporadically ever since I
joined (about 5 weeks ago). It's something that
happens once in a while on many mailing lists, I
wouldn't worry about it unless it becomes a regular occurence.

__________________________________________________
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Hash: SHA1

Anyone else getting duplicate messages? I seem to be getting them
sporadically on different messages on pgsql-general. Seems to have started
sometime Monday morning (estern us time)

One reason this happens is because people post to the list from an address
which is not subscribed. Their message gets addded the moderator's queue.
They then realize that they were not subscribed, and either subscribe
and send again, or send from another account, or send again so it gets
added to the moderator's queue multiple times. The moderator comes along and
approves the message(s) at some point. Thus, duplicate messages. In an ideal
world, the moderator or the original poster is constantly reading the list
and realized the post has already made it. Of course, in an ideal world,
people would subscribe to the list before attempting to send to it. :)

- --
Greg Sabino Mullane greg@turnstep.com
PGP Key: 0x14964AC8 200507271007
https://www.biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8

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On Wed, 2005-07-27 at 10:09, Greg Sabino Mullane wrote:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Anyone else getting duplicate messages? I seem to be getting them
sporadically on different messages on pgsql-general. Seems to have started
sometime Monday morning (estern us time)

One reason this happens is because people post to the list from an address
which is not subscribed. Their message gets addded the moderator's queue.
They then realize that they were not subscribed, and either subscribe
and send again, or send from another account, or send again so it gets
added to the moderator's queue multiple times. The moderator comes along and
approves the message(s) at some point. Thus, duplicate messages. In an ideal
world, the moderator or the original poster is constantly reading the list
and realized the post has already made it. Of course, in an ideal world,
people would subscribe to the list before attempting to send to it. :)

Seems unlikely unless folks like Tom Lane, Stephan Szabo, and Richard
Huxton have unsubscribed and resubscribed lately... Funny thing is it
isnt every messages, but maybe half of them. And its not to specific
users, sometimes one of Toms emails will duplicate but sometimes not.
Further more it only seems to be happening on pgsql-general emails and
not on any of the other lists... I also notice this is only happening on
one of my subscribed emails, not the other, which is a little weird...
according to the headers though, this problem is happening further
upstream.

Robert Treat
--
Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL

On Wed, Jul 27, 2005 at 11:46:05AM -0400, Robert Treat wrote:

Anyone else getting duplicate messages? I seem to be getting them
sporadically on different messages on pgsql-general. Seems to have started
sometime Monday morning (estern us time)

One reason this happens is because people post to the list from an address
which is not subscribed. Their message gets addded the moderator's queue.
They then realize that they were not subscribed, and either subscribe
and send again, or send from another account, or send again so it gets
added to the moderator's queue multiple times. The moderator comes along and
approves the message(s) at some point. Thus, duplicate messages. In an ideal
world, the moderator or the original poster is constantly reading the list
and realized the post has already made it. Of course, in an ideal world,
people would subscribe to the list before attempting to send to it. :)

Seems unlikely unless folks like Tom Lane, Stephan Szabo, and Richard
Huxton have unsubscribed and resubscribed lately... Funny thing is it
isnt every messages, but maybe half of them. And its not to specific
users, sometimes one of Toms emails will duplicate but sometimes not.
Further more it only seems to be happening on pgsql-general emails and
not on any of the other lists... I also notice this is only happening on
one of my subscribed emails, not the other, which is a little weird...
according to the headers though, this problem is happening further
upstream.

It happens every so often (I've noticed it 4 or 5 times in the past
few years). If you check the headers you'll probably find the dupes
come from one particular server. It appears to be multiple delivery
rather than reinjection of articles to the list.

Cheers,
Steve

On Wed, Jul 27, 2005 at 11:46:05 -0400,
Robert Treat <xzilla@users.sourceforge.net> wrote:

Seems unlikely unless folks like Tom Lane, Stephan Szabo, and Richard
Huxton have unsubscribed and resubscribed lately... Funny thing is it
isnt every messages, but maybe half of them. And its not to specific
users, sometimes one of Toms emails will duplicate but sometimes not.
Further more it only seems to be happening on pgsql-general emails and
not on any of the other lists... I also notice this is only happening on
one of my subscribed emails, not the other, which is a little weird...
according to the headers though, this problem is happening further
upstream.

Are some copies of these messages being sent directly to you without going
through the list? If so there is a way to tell the list server not to
send you copies if it appears you are getting a copy directly from the
sender.

On Wed, Jul 27, 2005 at 11:46:05AM -0400, Robert Treat wrote:

Seems unlikely unless folks like Tom Lane, Stephan Szabo, and Richard
Huxton have unsubscribed and resubscribed lately... Funny thing is it
isnt every messages, but maybe half of them. And its not to specific
users, sometimes one of Toms emails will duplicate but sometimes not.
Further more it only seems to be happening on pgsql-general emails and
not on any of the other lists... I also notice this is only happening on
one of my subscribed emails, not the other, which is a little weird...
according to the headers though, this problem is happening further
upstream.

I'd think it would be a problem with your "last mile", because it seems
to be a localized problem. Maybe an SMTP server dropping connections at
the last moment, or a deliver program crashing after delivering (leading
to re-delivery), or something like that.

You'd have to show us the headers though.

--
Alvaro Herrera (<alvherre[a]alvh.no-ip.org>)
"Find a bug in a program, and fix it, and the program will work today.
Show the program how to find and fix a bug, and the program
will work forever" (Oliver Silfridge)

On Wednesday 27 July 2005 12:30, Alvaro Herrera wrote:

On Wed, Jul 27, 2005 at 11:46:05AM -0400, Robert Treat wrote:

Seems unlikely unless folks like Tom Lane, Stephan Szabo, and Richard
Huxton have unsubscribed and resubscribed lately... Funny thing is it
isnt every messages, but maybe half of them. And its not to specific
users, sometimes one of Toms emails will duplicate but sometimes not.
Further more it only seems to be happening on pgsql-general emails and
not on any of the other lists... I also notice this is only happening on
one of my subscribed emails, not the other, which is a little weird...
according to the headers though, this problem is happening further
upstream.

I'd think it would be a problem with your "last mile", because it seems
to be a localized problem. Maybe an SMTP server dropping connections at
the last moment, or a deliver program crashing after delivering (leading
to re-delivery), or something like that.

You'd have to show us the headers though.

I would think that too, however take a look at these message headers:
the critical piece seems to be the handoff between postgresql.org and
commandprompt, where the ESMTP changes into j6RGoF0u002162 and j6RGj9mu001662
for what would otherwise be the same message.

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--
Robert Treat
Build A Brighter Lamp :: Linux Apache {middleware} PostgreSQL

Alvaro Herrera wrote:

On Wed, Jul 27, 2005 at 11:46:05AM -0400, Robert Treat wrote:

Seems unlikely unless folks like Tom Lane, Stephan Szabo, and Richard
Huxton have unsubscribed and resubscribed lately... Funny thing is it
isnt every messages, but maybe half of them. And its not to specific
users, sometimes one of Toms emails will duplicate but sometimes not.
Further more it only seems to be happening on pgsql-general emails and
not on any of the other lists... I also notice this is only happening on
one of my subscribed emails, not the other, which is a little weird...
according to the headers though, this problem is happening further
upstream.

I'd think it would be a problem with your "last mile", because it seems
to be a localized problem. Maybe an SMTP server dropping connections at
the last moment, or a deliver program crashing after delivering (leading
to re-delivery), or something like that.

You'd have to show us the headers though.

For the last few days, I am getting about half of the messages on
-general in duplicate also. I've attached two messages that I got in
duplicate for header perusal.

It seems kind of unlikely that this should start happening to all of us
at once.

Paul

On Wed, Jul 27, 2005 at 01:55:51PM -0400, Robert Treat wrote:

On Wednesday 27 July 2005 12:30, Alvaro Herrera wrote:

On Wed, Jul 27, 2005 at 11:46:05AM -0400, Robert Treat wrote:

Seems unlikely unless folks like Tom Lane, Stephan Szabo, and Richard
Huxton have unsubscribed and resubscribed lately... Funny thing is it
isnt every messages, but maybe half of them. And its not to specific
users, sometimes one of Toms emails will duplicate but sometimes not.
Further more it only seems to be happening on pgsql-general emails and
not on any of the other lists... I also notice this is only happening on
one of my subscribed emails, not the other, which is a little weird...
according to the headers though, this problem is happening further
upstream.

I'd think it would be a problem with your "last mile", because it seems
to be a localized problem. Maybe an SMTP server dropping connections at
the last moment, or a deliver program crashing after delivering (leading
to re-delivery), or something like that.

You'd have to show us the headers though.

I would think that too, however take a look at these message headers:
the critical piece seems to be the handoff between postgresql.org and
commandprompt, where the ESMTP changes into j6RGoF0u002162 and j6RGj9mu001662
for what would otherwise be the same message.

Strange. I'd expect that this message had been crossposted to more than one
list, but it isn't.

--
Alvaro Herrera (<alvherre[a]alvh.no-ip.org>)
"Aprende a avergonzarte m�s ante ti que ante los dem�s" (Dem�crito)