[Varnish] #793: TTL randomizing

[Varnish]

#793: TTL randomizing
-------------------------+--------------------------------------------------
 Reporter:  tmagnien     |       Owner:  phk                     
     Type:  enhancement  |      Status:  new                     
 Priority:  normal       |   Milestone:                          
Component:  varnishd     |     Version:  trunk                   
 Severity:  normal       |    Keywords:  expiry randomization ttl
-------------------------+--------------------------------------------------
 Hi,

 Here is a vmod patch to allow TTL randomization. This can be used to avoid
 the "lemming effect" described [http://www.varnish-
 cache.org/trac/wiki/PostTwoShoppingList#Expiryrandomization here].

 Use in VCL :

 {{{
 sub vcl_fetch {
         set beresp.ttl = std.randomize_ttl_by(beresp.ttl, 50);
 }
 }}}

 Will randomize all TTLs by 50%.

 Regards,
 Thierry

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Ticket URL: <http://varnish-cache.org/trac/ticket/793>
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