[Varnish] #837: varnishadm purge.list fails frequently

[Varnish]

#837: varnishadm purge.list fails frequently
----------------------+-----------------------------------------------------
 Reporter:  jelder    |       Owner:  kristian         
     Type:  defect    |      Status:  new              
 Priority:  normal    |   Milestone:  After Varnish 2.1
Component:  varnishd  |     Version:  trunk            
 Severity:  normal    |    Keywords:  purge.list       
----------------------+-----------------------------------------------------

Comment(by jelder):

 I've disabled the secret in one of the varnish instances in our staging
 environment. I will reply to the ticket once we've reached the absurd
 level of purges in production, and can verify that the issue is
 reproducible via telnet.

 We rely on saint mode (obj.grace = 1h), and as I understand things,
 enabling the ban lurker would purge objects from the cache which we might
 want to serve during an outage. Unless I misunderstand things, we would
 need ban lurker to be aware of the grace period in some way, right?


 {{{
 sub vcl_recv {
     set req.backend = haproxy;
     if (req.backend.healthy) {
         /* A different thread has already made a request to the backend
 but it
          * hasn't completed yet. */
         set req.grace = 30s;
     } else {
         /* Either HAProxy is down or it's telling us via /haproxy_test
 that all
          * of its backends are down. */
         set req.grace = 1h;
     }


 }

 sub vcl_fetch {

     /* Enter saint mode when we see at least backend.saintmode_threshold
 of the
      * following errors in a period of 10 seconds. */
     if (
         beresp.status == 500 || /* Internal Server Error */
         beresp.status == 502 || /* Bad Gateway */
         beresp.status == 503 || /* Service Unavailable */
         beresp.status == 504    /* Gateway Timeout */
     ) {
         set beresp.saintmode = 10s;
         restart;
     }

     set beresp.grace = 1h;
 }

 }}}

-- 
Ticket URL: <http://www.varnish-cache.org/trac/ticket/837#comment:2>
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