Mailing List Archive

#1701: Bans keep increasing, despite ban lurker removing them
--------------------+--------------------
Reporter: rbartl | Type: defect
Status: new | Priority: normal
Milestone: | Component: build
Version: 3.0.6 | Severity: normal
Keywords: |
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We have a high number of bans hitting our varnish cache.
After some time running varnish those bans dont get deleted anymore.

n_ban is ever increasing, and n_ban_retire is not changing.

But Varnish Log reports ExpBan (AFAIK this is a notice that a ban gets
marked as complete)
{{{
varnishlog | grep -i expban
38 ExpBan c 1971612403 was banned
61 ExpBan c 1971612483 was banned
32 ExpBan c 1971612438 was banned
35 ExpBan c 1971604741 was banned

}}}


Bans are increasing, and not retired ->
{{{
varnishstat -1 | grep -i ban ; sleep 120 ; varnishstat -1 | grep -i ban
:(
n_ban 68391 . N total active bans
n_ban_gone 11743 . N total gone bans
n_ban_add 131903 14.37 N new bans added
n_ban_retire 63512 6.92 N old bans deleted
n_ban_obj_test 28425760 3097.16 N objects tested
n_ban_re_test 3347374701 364717.23 N regexps tested against
n_ban_dups 23818 2.60 N duplicate bans removed
LCK.ban.creat 19 0.00 Created locks
LCK.ban.destroy 0 0.00 Destroyed locks
LCK.ban.locks 203959983 22222.70 Lock Operations
LCK.ban.colls 0 0.00 Collisions
n_ban 68913 . N total active bans
n_ban_gone 12222 . N total gone bans
n_ban_add 132425 14.24 N new bans added
n_ban_retire 63512 6.83 N old bans deleted
n_ban_obj_test 28466827 3061.61 N objects tested
n_ban_re_test 3420460198 367870.53 N regexps tested against
n_ban_dups 24041 2.59 N duplicate bans removed
LCK.ban.creat 19 0.00 Created locks
LCK.ban.destroy 0 0.00 Destroyed locks
LCK.ban.locks 204014587 21941.77 Lock Operations
LCK.ban.colls 0 0.00 Collisions
}}}

When i call ban.list in varnishadm varnish hangs and gets restarted by its
watcher adm reports a 400 error) then the ban list is empty again of
course.

When does varnish "garbage"-collect the ban list ?

Problem about this behaviour is that the ever increasing ban list is
slowing down all requests.

Regards, RB.

--
Ticket URL: <https://www.varnish-cache.org/trac/ticket/1701>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator

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