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Subject: Re: Tens of thousands of messages stuck in incoming?
From: Brad Knowles (blkskynet.be)
Date: Thu Apr 06 2000 - 02:50:14 CDT

At 10:27 AM +1000 2000/4/6, Andrew McNamara wrote:

> We saw this when the active queue had more than qmgr_message_active_limit
> jobs for one *very* slow site - that site ended up taking up all the active
> slots, and nothing could be moved out of incoming.

        We increased the maximum allowed size of the active queue to 2000
messages, and I haven't once seen this queue actually exceed one
thousand messages on any of our machines, including the sick ones.

> Increasing qmgr_message_active_limit, and adding a transport table entry
> to offload the offending sites mail somewhere else fixed it in our case.

        Unfortunately, I've checked the queues on that machines, and I've
got no more than a couple hundred recipients at yahoo.com, and that's
the single biggest recipient site on the list.

        I should be able to add a transport table entries for the domains
we host, so that they are handled separately, and don't get nailed by
clogs elsewhere in the queue.

> The latest version of postfix has a huristic that can help in this
> situation. From the changelog:
>
> - Workaround to prevent one site with a huge backlog from blocking
> all other deliveries. This is controlled by a new configuration
> parameter qmgr_site_hog_factor (default: 90 percent) that limits
> how much in-memory queue manager resources a site can claim.

        I don't think this will affect us, but I'll try some
modifications here, too. 

--
   These are my opinions -- not to be taken as official Skynet policy
======================================================================
Brad Knowles, <blkskynet.be>                || Belgacom Skynet SA/NV
Systems Architect, Mail/News/FTP/Proxy Admin || Rue Colonel Bourg, 124
Phone/Fax: +32-2-706.13.11/12.49             || B-1140 Brussels
http://www.skynet.be                         || Belgium