[SR-Users] DMQ and/or Database for dialogs, registrations, etc..

[Alex Balashov]

Hello Joel,

Our experience with using DMQ for dialog and usrloc replication has been
very positive, and we recommend it wholeheartedly over the crusty
database sync-based methods. 

The primary appeal comes from the fact that the replication is done at a
higher level, so there is no need to contend with issues surrounding the
degree of two-way coupling that DB-backed modules have. For instance,
the dialog module has both "runtime" and "persistent" components to its
backing, so while the dialog module can store dialog info in a DB table,
it can't store profile info. Replicating dialogs via DMQ allows one to
share profile state. 

And in general, it's a lot more efficient. If you have 3 or 4
registrars, you have a reasonable degree of persistence if you use in
memory-only storage for usrloc with DMQ replication. That takes an
enormous workload off the database. 

Databases are for storage; they aren't great for highly ephemeral,
short-lived, real-time data, though they're often (mis)used for that
purpose:

https://en.wikipedia.org/wiki/Database-as-IPC

DMQ solves a much-needed gap here in Kamailio, and I hope it is extended
to provide transport for other components too.

-- Alex

On Fri, Apr 27, 2018 at 08:31:56AM -0700, Joel Serrano wrote:

> Hi all,
> 
> Just wanted to know what your opinions were on using DMQ modules over
> database for things like dialog replication, registrations, etc...
> 
> Is DMQ the "new way to go"? I know that there lots of ways of doing things
> with each having pros/cons... But I was wondering...
> 
> What does the community think on this topic?
> 
> Are you guys taking advantage of the DMQ modules or are you still relying
> on database as much as possible? Maybe a combination of both?
> 
> Cheers,
> Joel.

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-- 
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/