[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 11:21:59 CEST 2012


#849: Session timeout while receiving POST data from client causes multiple
broken backend requests
----------------------+-----------------------------------------------------
 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):

 I forgot to write that we use Varnish 2.1.5.



 Replying to [comment:7 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:8>
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