[OpenSIPS-Users] mid registrar

[Liviu Chircu]

First of all: mid-registrar + clustering is still uncharted territory, I 
haven't done any testing yet with this setup.

Disclaimer aside, this setup should somewhat work:

* [CORRECT] mid-registrar saved contacts should propagate through the 
cluster just like with registrar. They will contain the short lifetime 
of the UAC side, not the longer lifetime shown to the backend registrar
* [CORRECT] throttled contact updates should propagate through the 
cluster just like with registrar (although we absorb the REGISTER, we 
instruct other nodes to update their cache, so they don't delete the 
contact prematurely)
* [INCORRECT] the mid-registrar semantics (specific fields) are not 
getting replicated to other nodes. If you fail over to another 
mid-registrar within the cluster, you won't be able to throttle contacts 
anymore. In fact, you should see something like:

ERROR:'last_reg_ts' key not found!

, and the handling for the "inherited" REGISTER traffic would completely 
fail.

To sum up: this setup should "kinda" work, but it's not going to be 
fully useful unless we fix it. Replicating the "kv_store" should not be 
complicated at all (actually, it seems to be a 50-line patch at most), 
but it will require the usual bit of testing / fiddling around until all 
corner-cases are covered.

We've not had requests for this feature up until now, but I've logged it 
on GitHub, so we can start a discussion [1]

Best regards,

[1]: https://github.com/OpenSIPS/opensips/issues/1379

Liviu Chircu
OpenSIPS Developer
http://www.opensips-solutions.com

On 08.06.2018 12:13, volga629 at networklab.ca wrote:
> Hello Liviu,
> What will happened if set federation-cachedb-cluster and mid registrar 
> is in use.
>
>
> volga629
>
> On Fri, Jun 8, 2018 at 5:41 AM, Liviu Chircu <liviu at opensips.org> wrote:
>> Hi Volga,
>>
>> The mid-registrar has full DB persistency support since 2.4. It works 
>> with all the user location presets except the "DB only" ones. For 
>> example, you only have to set:
>>
>> modparam("usrloc", "working_mode_preset", 
>> "single-instance-sql-write-through")
>>
>> or
>>
>> modparam("usrloc", "working_mode_preset", 
>> "single-instance-sql-write-back")
>>
>> Best regards,
>>
>> Liviu Chircu
>> OpenSIPS Developer
>> http://www.opensips-solutions.com
>>
>> On 08.06.2018 02:48, volga629 at networklab.ca wrote:
>>> Hello Everyone,
>>> Is possible configure mid registrar with database persistency ?
>>>
>>>
>>>
>>> volga629
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opensips.org
>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users at lists.opensips.org
>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>
>
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