Well,

I asked a similar question here https://lists.kamailio.org/pipermail/sr-users/2022-July/115160.html but no answer yet :) 

What I see on my side is that it indeed works, the only drawback is that the same contact is getting synced to DB, which causes a duplicate error unless you use the "db_insert_update" option.

Done that seems that it works ok (did tested in prod yet), and I had the all the contacts live on all nodes and on db. The only downside that maybe can happen is that the periodic sync may skew a bit the expire time and maybe give a contact some more seconds, but it really depends on timings of the clusters.

But I'm really interested in the answer, too :)

-- Matteo

On Mon, Sep 26, 2022 at 4:07 PM Alex Balashov <abalashov@evaristesys.com> wrote:

Hi,

Are there any known contraindications for replicating contacts using dmq/dmq_usrloc, and injecting those contacts into a database on one of the nodes using usrloc with `db_mode` 1 or 2?

Predictably, this is being done to support the use-case of getting registration status from database. If you think this should be done with JSONRPC, I am in complete agreement with you, but it’s not up to me. :-)

I am doing this with `db_mode` 2 now, and finding that, for a small number of AORs, one can find instances where they are consistently stored in memory but not present in the `location` table. The overall proportion of these AORs, out of thousands, seems to be quite small. It was initially somewhat higher, and it went down once I increased usrloc `timer_processes` and increased the sync interval from 30 to 60 seconds.

Nevertheless, it is still non-zero, and I am getting intermittent reports. I wonder if there are some prior experiences with this and anything to watch out, or if `db_mode` 1 might be a superior choice. I personally cannot see how that would be; it seems to have all the performance downsides of mode 3. But perhaps if something about it is more “problem-free” vis-a-vis DMQ, it’s worth a shot?

— 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/


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