[Spread-users] Spread daemon -8 and -11 errors

[Jacob Green]

CONNECTION_CLOSED is often due to joined spread clients not receiving
messages fast enough.  Spread daemons will do _some_ buffering of messages
(up to 10,000 by default), but ultimately if your senders far outpace your
receiver's capacity, you will need to implement some sort of flow control. 

Discussions and suds code for possible flow control methods can be found on
the list at:
http://lists.spread.org/pipermail/spread-users/2003-June/001483.html

and a detailed analysis at the bottom of:
http://lists.spread.org/pipermail/spread-users/2002-May/000767.html

Jacob

> -----Original Message-----
> From: spread-users-admin at lists.spread.org [mailto:spread-users-
> admin at lists.spread.org] On Behalf Of Chetan Gadgil
> Sent: Monday, December 22, 2003 10:52 PM
> To: 'Bill Montgomery'
> Cc: spread-users at lists.spread.org
> Subject: RE: [Spread-users] Spread daemon -8 and -11 errors
> 
> I have the same situation - I get arbitrary disconnects:
> 
> (The SP_receive call returns CONNECTION_CLOSED)
> 
> 
> I am using spread under Windows XP Professional, with all the patches
> (service packs) and spread compiled with MS-VS.NET 2003.
> 
> This tends to happen under heavy load situations. (Large number of
> messages)
> 
> Chetan
> 
> 
> Bucy's Law:
>         Nothing is ever accomplished by a reasonable man.
> 
> 
> 
> > -----Original Message-----
> > From: spread-users-admin at lists.spread.org
> > [mailto:spread-users-admin at lists.spread.org] On Behalf Of
> > Bill Montgomery
> > Sent: Tuesday, December 23, 2003 3:01 AM
> > To: mls-users at lists.backhand.org
> > Cc: spread-users at lists.spread.org
> > Subject: [Spread-users] Spread daemon -8 and -11 errors
> >
> >
> > Hi,
> > I'm running mod_log_spread with apache 2.0.47, using the prefork MPM,
> > and spread 3.17.1. There is a spread daemon running locally
> > on each web
> > server, specified with the following line in httpd.conf:
> >
> > SpreadDaemon 3333
> >
> > Most (75%?) of the apache log messages are being sent over the spread
> > ring and are recorded by spreadlogd on my logging host.
> > However, portion
> > of the log messages cause an error, and are not succesfully
> > sent to the
> > spread daemon. The errors look like this in the apache error log:
> >
> > [Mon Dec 22 14:24:42 2003] [crit] [client 66.193.5.50] Spread Daemon
> > returned an error. -11 This Request could not be logged
> > /author/upload/upload_progress.cgi
> >
> > There are also occasional -8 spread errors. Looking at sp.h in the
> > spread source tells me that these errors are
> > CONNECTION_CLOSED (-8) and
> > ILLEGAL_SESSION (-11). These errors are returned a dozen different
> > places in the spread daemon code, and I wasn't able to tell
> > why in most
> > cases.
> >
> > READMEs, Google, and mailing list archives have not turned up
> > anything
> > useful. I tried linking mod_log_spread.so against libtspread,
> > thinking
> > it might be a problem with thread safety (don't think it
> > should be, with
> > the apache prefork MPM), but the same symptoms are present.
> > Could this
> > be a message length problem? I don't have any absurdly long URL's I'm
> > servering up, and I'm using the standard "combined" log
> > format. Probably
> > no measureable percentage of log messages longer than 300 characters,
> > except that I'm losing a large fraction of the log messages.
> >
> > Also, I see the same symptoms on a web server that is under a
> > heavy load
> > (~10 log messages/sec) and another that has no load (just me
> > testing). I
> > see no pattern to the failures on the server under heavy
> > load, but I can
> > hit certain pages that will always generate a spread error on
> > the test
> > server.
> >
> > Anyone ever seen something like this? TIA for your help.
> >
> > Best Regards,
> > Bill Montgomery
> >
> >
> > _______________________________________________
> > Spread-users mailing list
> > Spread-users at lists.spread.org
> > http://lists.spread.org/mailman/listinfo/sprea> d-users
> >
> 
> 
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