[Kolab-devel] [issue1256] High load conditions can make postfix bounce emails.

[Bernhard Reiter]

New submission from Bernhard Reiter <bernhard at intevation.de>:

Kolab Server 2.1-beta1,             
             
there was a condition at a customer where the system             
was in an obnormal situation.              
Probably this was related to linux or hardware problems.             
The average load was shown with 37 or more then 40.0,             
while the CPU was idling and vmstat did not show disc activity.             
Inspection with top also did not show swapping or processing with             
high memory.             
             
Under this conditions, emails to the system bounced.             
Here from a bounce message:             
             
  This is the Postfix program at host kolabserver.example.org.        
        
  I'm sorry to have to inform you that your message could not       
  be delivered to one or more recipients. It's attached below.       
       
  For further assistance, please send mail to <postmaster>       
       
  If you do so, please include this problem report. You can       
  delete your own text from the attached returned message.       
       
                        The Postfix program       
       
  <test.er at kolabserver.example.org>: Command time limit exceeded:       
      "/kolab/bin/php"       
      
from the delivery report, attached to the bounce message:     
  Final-Recipient: rfc822; test.er at kolabserver.example.org   
  Action: failed   
  Status: 5.0.0   
  Diagnostic-Code: X-Postfix; Command time limit exceeded: "/kolab/bin/php"   
    
Though this is a bad behaviour, the best way to behave under load would be 
to defer the messages and not bounce them. 
 
>From the error message my hypothesis is that kolabfilter  
or kolabmailboxfilter could not complete in time because of the system load 
or other bad conditions of the system. 
At this point it would have been almost better to stop the system 
and have other MTAs queue the delivery then to accept it and then bounce.

----------
messages: 7488
nosy: bernhard, bh, martin, steffen, torsten
priority: bug
status: unread
title: High load conditions can make postfix bounce emails.
topic: server
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