[Varnish] #951: varnish stalls connections on high traffic to non-cacheable urls

[Varnish]

#951: varnish stalls connections on high traffic to non-cacheable urls
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 Reporter:  tttt                 |        Type:  defect  
   Status:  new                  |    Priority:  normal  
Milestone:  Varnish 2.1 release  |   Component:  varnishd
  Version:  2.1.5                |    Severity:  major   
 Keywords:                       |  
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Comment(by tttt):

 actually i was wrong, some requests do get thru for the stuck url, haproxy
 log stats:


 {{{
      82 200 ---- GET xxx # got thru
    1480 -1  CH-- GET xxx # client cancel, that mostly means people click
 cancel, but also might include some slow 200 responses
    2884 504 sH-- GET xxx # timeout on waiting for varnish
 }}}

 in the roughly same timeframe apache servers report around 600 hits with
 status 200 on this same url

 theres also few 500/503 apache responses - under pressure apache/php will
 spit out few errors for granted.

 i'm sure its not apache problem as i have haproxy that stands before and
 after varnish in request path - and haproxy is rock solid in my
 experience.

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Ticket URL: <http://www.varnish-cache.org/trac/ticket/951#comment:1>
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