[Varnish] #1151: Varnish to Apache sometimes return error 503

[Varnish]

#1151: Varnish to Apache sometimes return error 503
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 Reporter:  rj@…                   |        Type:  defect
   Status:  new                    |    Priority:  high  
Milestone:                         |   Component:  build 
  Version:  3.0.2                  |    Severity:  major 
 Keywords:  503 http error apache  |  
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Comment(by rj@…):

 Some more debug information. I had varnishtop running since I created this
 ticket.

 Load 1
 {{{
      3224774         3.99         2.61 backend_conn - Backend conn.
 success
           27         0.00         0.00 backend_unhealthy - Backend conn.
 not attempted
           63         0.00         0.00 backend_fail - Backend conn.
 failures
       358798         0.00         0.29 backend_reuse - Backend conn.
 reuses
        21035         0.00         0.02 backend_toolate - Backend conn. was
 closed
       379834         0.00         0.31 backend_recycle - Backend conn.
 recycles
           26         0.00         0.00 backend_retry - Backend conn. retry

 }}}

 Load 2

 {{{
      3217751         5.99         2.61 backend_conn - Backend conn.
 success
           32         0.00         0.00 backend_fail - Backend conn.
 failures
       364185         0.00         0.30 backend_reuse - Backend conn.
 reuses
        27077         0.00         0.02 backend_toolate - Backend conn. was
 closed
       391263         0.00         0.32 backend_recycle - Backend conn.
 recycles
           36         0.00         0.00 backend_retry - Backend conn. retry

 }}}

 I have received more 503 errors but varnish haven't registered any
 backend_fail's?

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1151#comment:2>
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