[Varnish] #373: Varnish fails to reload backend/directory

[Varnish]

#373: Varnish fails to reload backend/directory
----------------------+-----------------------------------------------------
 Reporter:  anders    |       Owner:  phk  
     Type:  defect    |      Status:  new  
 Priority:  normal    |   Milestone:       
Component:  varnishd  |     Version:  trunk
 Severity:  normal    |    Keywords:       
----------------------+-----------------------------------------------------
 When reloading VCL by using vcl.load and vcl.use, Varnish fails to update
 which hosts to probe.

 Given this VCL:

 {{{
 backend kart3d1 {
        .host = "192.168.41.134";
        .port = "80";
        .probe = {
                .request =
                        "GET /varnish-lb-check.html HTTP/1.1"
                        "Host: foo.bars.no"
                        "Connection: close";
                .timeout = 5s;
                .window = 8;
                .threshold = 3;
                .interval = 2s;
        }
 }
 backend kart3d2 {
         .host = "192.168.41.135";
         .port = "80";
         .probe = {
                 .request =
                         "GET /varnish-lb-check.html HTTP/1.1"
                         "Host: foo.bars.no"
                         "Connection: close";
                 .timeout = 5s;
                 .window = 8;
                 .threshold = 3;
                 .interval = 2s;
         }
 }


 director kart3dlb random {
        {
                .backend = kart3d1;
                .weight = 100;
        }
         {
                 .backend = kart3d2;
                 .weight = 100;
         }
 }
 }}}

 If one backend is commented out (as backend, and in the directory), and
 VCL is reloaded, Varnish still polls it. If the host header is updated, a
 full restart of Vartnish is also necessary.

 Conclusion: it seems Varnish is unable to update backend/director runtime,
 without a restart. It would be nice to have this fixed, so that cache
 servers with a large dataset do not lose their data because of load
 balancing changes.

-- 
Ticket URL: <http://varnish.projects.linpro.no/ticket/373>
Varnish <http://varnish.projects.linpro.no/>
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