[SR-Users] usrloc db_mode 2 and dropped contacts

[M S]

Hi,

There are multiple scenarios and possibilities for this behavior, please
check,

1. What kind of sip endpoints you have? Any TCP based transport e.g. TLS or
WSS endpoint? Are they mobile apps (especially iOS devices) with push
notification and "backgrounding" support?

2. How many distinct SIP re-registers (SQL Updates) you have at a time?
Please also check if they are lower then actual endpoints.

Thank you.


On Fri, Mar 6, 2020 at 7:32 PM Alex Balashov <abalashov at evaristesys.com>
wrote:

> And another question that goes along with this:
>
> Do I need `db_timer_clean` to make db_mode 2 work as expected?
>
> A reasonable person would conclude from the documentation for
> `timer_interval` and `db_mode 2` ...
>
>    "2 - Write-Back scheme. This is a combination of previous two
>    schemes. All changes are made to memory and database synchronization
>    is done in the timer. The timer deletes all expired contacts and
>    flushes all modified or new contacts to database."
>
>    "The module uses a timer to delete expired contacts, synchronize with
>    database and other tasks, that need to be run periodically."
>
> ... that deletion of expired contacts is propagated to underlying DB
> storage (passed through the logic of whichever db_mode) in the form of
> periodic deletions of expired contacts.
>
> It appears not to be enabled by default. DELETE statements appear to be
> issued periodically from usrloc even though it's not enabled.
>
> So, what's that setting for? When and why do I need it?
>
> -- Alex
>
> On Fri, Mar 06, 2020 at 12:58:16PM -0500, Alex Balashov wrote:
>
> > Hi,
> >
> > On 4.4.7, since switching to db_mode 2 for usrloc with the following
> settings:
> >
> >    modparam("usrloc", "db_mode", 2)
> >    modparam("usrloc", "timer_procs", 2)
> >    modparam("usrloc", "skip_remote_socket", 1)
> >    modparam("usrloc", "timer_interval", 30)
> >    modparam("usrloc", "matching_mode", 0)
> >
> > I seem to run into a situation where, despite starting from zero local
> > registrations and an empty DB `location` table, out of ~1700
> > registrations visible in the runtime usrloc table, about 60-80 never
> > make it into the database.
> >
> > This is because they're being continuously UPDATE'd rather than
> > INSERT'd, so there is some presumption that they should already be in
> > the Postgres database. But they're not.
> >
> > This gap seems to very slowly grow over time.
> >
> > I understand that this option is intended to deal with a scenario like
> > that:
> >
> >
> https://kamailio.org/docs/modules/5.3.x/modules/usrloc.html#usrloc.p.db_check_update
> >
> > but the documentation doesn't say it needs to be on for db_mode 2 to
> > work correctly, and it's off by default.
> >
> > I'm wondering what causes certain registrants to get into this state in
> > the first place, where the registrar presumes that they've already been
> > synced to the DB and only need to be update'd on renewal, where in fact
> > they have not been synced.
> >
> > Causes I've ruled out:
> >
> > 1) The contacts being ignored due to non-local socket or other
> > invalidation;
> >
> > 2) Contacts being explicitly deleted by an outside process.
> >
> > Any ideas appreciated!
> >
> > -- Alex
> >
> > --
> > Alex Balashov | Principal | Evariste Systems LLC
> >
> > Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> > Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
> >
> > _______________________________________________
> > Kamailio (SER) - Users Mailing List
> > sr-users at lists.kamailio.org
> > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
> --
> Alex Balashov | Principal | Evariste Systems LLC
>
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>
> _______________________________________________
> Kamailio (SER) - Users Mailing List
> sr-users at lists.kamailio.org
> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.kamailio.org/pipermail/sr-users/attachments/20200307/972fea06/attachment.html>