[SR-Users] DMQ question

[Charles Chance]

In the first instance, you could use dmq_is_from_node() to determine if the
message is a replicated one and if so, don't relay.

There's no specific function to check the state of other nodes, although it
would be a simple addition. If I understand your question correctly,
however, if the message has just been replicated by the primary server then
it's safe to assume it's in service, right?

Cheers,
Charles


On 3 March 2016 at 16:14, Alex Balashov <abalashov at evaristesys.com> wrote:

> On 03/03/2016 11:09 AM, Charles Chance wrote:
>
> Yes, you are correct. It simply wraps the standard t_replicate()
>> function, replicating the original request to every other node (first
>> appending a new branch for each). Use case is essentially the same as
>> the original but having the benefit of not having to define
>> destination(s) statically in config, since that part is handled by DMQ.
>>
>
> I see! Thank you.
>
> What I've got seems like a good use-case for clustering over DMQ as a
> transport: a number of Kamailio servers that all answer on the same SIP
> domain, and a nondeterministic Layer 3 routing topology where some replies
> occasionally traverse a different Kamailio server to the one that processed
> the request to which they correspond. For a wide variety of reasons, I need
> to handle all this statefully, not statelessly.
>
> So, it seems like I ought to be able to dmq_t_replicate() incoming INVITEs
> to other nodes and, on those nodes, instantiate the transaction with
> t_newtran(). But one would also need to devise a mechanism to inform those
> secondary nodes that the message should not be t_relay()'d unless the
> primary server for which it was intended (itself difficult to identify due
> to same SIP domain everywhere) was determined to be out of service. I don't
> suppose there's some clever shortcut to implementing that kind of
> conditional logic manually?
>
>
> -- Alex
>
> --
> Alex Balashov | Principal | Evariste Systems LLC
> 303 Perimeter Center North, Suite 300
> Atlanta, GA 30346
> United States
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>
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