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Postfix Archives: Slow downstream site wedged my Postfix...

Slow downstream site wedged my Postfix...

Subject: Slow downstream site wedged my Postfix...
From: Andrew McNamara (andrewmconnect.com.au)
Date: Tue Jan 25 2000 - 05:38:54 CST

And the baby chewed the axle off. 8-)

A downstream site using us as an MX secondary all but completely wedged
Postfix on one of our servers today. I think I remember Wietse
mentioning this scenario before.

The primary MX host of the site in question was very slow accepting
e-mail, and a lot of mail built up for them on one of our postfix
machines (around 10000 jobs).

Because they weren't actually down, qmgr didn't move their jobs into
the defered queue. Eventually, all the jobs in the active queue were
for this one site (qmgr_message_active_limit = 5000), and legitimate
mail started backing up in the incoming directory. Complaints about
delays of several hours from other sites prompted me to start poking.

As I understand it, qmgr already knows how many connections it has open
to a given site (so it can implement initial_destination_concurrency
limits). I wonder if it would be feasable for it to also track how many
jobs in the active queue were for a given site, and either move them
straight into deferred or just ignore them in incoming when they pass
some threshold?

 ---
Andrew McNamara (System Architect)

connect.com.au Pty Ltd
Lvl 3, 213 Miller St, North Sydney, NSW 2060, Australia
Phone: +61 2 9409 2117, Fax: +61 2 9409 2111

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