[Varnish] #849: Session timeout while receiving POST data from client causes multiple broken backend requests

Varnish varnish-bugs at varnish-cache.org
Mon Jul 2 11:14:24 CEST 2012


#849: Session timeout while receiving POST data from client causes multiple
broken backend requests
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 Reporter:  lew       |       Owner:  tfheen                                                               
     Type:  defect    |      Status:  new                                                                  
 Priority:  normal    |   Milestone:  Varnish 3.0 dev                                                      
Component:  varnishd  |     Version:  2.1.4                                                                
 Severity:  normal    |    Keywords:  503, post, backend write error: 11 (Resource temporarily unavailable)
----------------------+-----------------------------------------------------

Comment(by vrobert):

 Hello,

 we had this issue too.
 I've done some tests: disabling keepalive or increasing the keepalive on
 apache does nothing.

 The thing is bizzare because some of our customers seem to be more
 affected than others. (Slow connection, perhaps but not sure)

 I don't want to use pipe.
 Increasing of sess_timeout have extended the waiting time before the error
 arrives, but the number of errors is always the same.

 Statistics on 06/26/2012: 1571434 POST - 3336 POST with 503 (0.21%) -
 sess_timeout = 5
 Statistics on 06/27/2012: 1391161 POST - 3011 POST with 503 (0.19%) -
 sess_timeout = 5
 Statistics on 06/28/2012: 1322403 POST - 2493 POST with 503 (0.20%) -
 sess_timeout = 5
 Statistics on 06/29/2012: 1328187 POST - 2645 POST with 503 (0.21%) -
 sess_timeout = 5 & 10
 Statistics on 06/30/2012: 1201337 POST - 2593 POST with 503 (0.22%) -
 sess_timeout = 10
 Statistics on 07/01/2012: 1270146 POST - 2841 POST with 503 (0.21%) -
 sess_timeout = 10

-- 
Ticket URL: <https://www.varnish-cache.org/trac/ticket/849#comment:7>
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