[Varnish] #1239: Problem with cleaning up "gone" bans

[Varnish]

#1239: Problem with cleaning up "gone" bans
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 Reporter:  xani      |       Owner:  martin
     Type:  defect    |      Status:  closed
 Priority:  normal    |   Milestone:
Component:  varnishd  |     Version:  3.0.3
 Severity:  normal    |  Resolution:  invalid
 Keywords:            |
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Changes (by martin):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 Hi,

 Ban list length starting to accumulate when you have req.* parts in your
 ban lists is very much the expected behavior. Due to the way ban lists are
 implemented, they can only ever be removed off the tail of the list. The
 ban lurker's responsibility is to work on the tail of the list in order to
 free the bans there. But the moment a req.* ban is at the tail, the ban
 lurker can't do anything with it (the ban lurker obviously is not running
 in the context of a request, thus can't match anything on req.*). So the
 ban list length then will grow indefinitely until that ban clears any
 other way (objects it's linked to is actually requested or their TTL
 elapses). Solution is to not use ban expressions with req.* in them.

 I'll close this ticket as invalid.

 Regards,
 Martin Blix Grydeland

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1239#comment:6>
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