[Varnish] #674: Any failed request should be enough to decide backend is sick

[Varnish]

#674: Any failed request should be enough to decide backend is sick
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 Reporter:  istenrot     |       Owner:  phk                    
     Type:  enhancement  |      Status:  new                    
 Priority:  normal       |   Milestone:                         
Component:  varnishd     |     Version:  trunk                  
 Severity:  normal       |    Keywords:  saintmode probe backend
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 As of Varnish 2.1.0 only failed probe requests can switch backend's status
 from healthy to sick. Any failed normal request should be also a clear
 signal to Varnish that a corresponding backend has gone sick.

 The problem is that saintmode doesn't get activated until a probe request
 has been made and decided as failed. That may result publishing 503 errors
 for many seconds depending on probe request interval setting.

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Ticket URL: <http://www.varnish-cache.org/ticket/674>
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