[Varnish] #824: Saintmode: repeated failure causes varnish to go into 503 mode

Varnish varnish-bugs at varnish-cache.org
Mon Dec 6 14:20:42 CET 2010

#824: Saintmode: repeated failure causes varnish to go into 503 mode
 Reporter:  grosser2  |       Owner:  kristian
     Type:  defect    |      Status:  new     
 Priority:  normal    |   Milestone:          
Component:  varnishd  |     Version:  trunk   
 Severity:  normal    |    Keywords:          
Changes (by kristian):

  * owner:  => kristian
  * component:  build => varnishd


 When you say repeated requests, are those identical requests or requests
 to different pages giving 500-errors? And how precise is that "5+/-"

 Are you really on trunk, or some other version?

 It sounds like you are filling the saintmode list - there is a threshold
 (which you can set with saintmode_threshold, defaults to 10 objects). When
 you've added more objects to the saintmode list than the threshold
 specifies, the entire backend will be considered sick - even if
 healthprobes indicate that everything is OK. It sounds like this is what
 you are hitting.

 It's not really recommended to use saint mode for 30 minutes. And you
 should throw in a restart at the end. Typical lengths for saint mode is
 20-30 seconds, not minutes, so you're well outside the norm.

Ticket URL: <http://varnish-cache.org/trac/ticket/824#comment:1>
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