[SR-Users] dispatcher, pvar_hash and multiple kamailio instances

[Henning Westerholt]

Hello Barry,

If I understand you correctly you want to achieve a stable hash algorithm distribution.

Right now, I can only think of some bug fixes that could be the reason for the different behaviour of the 4.3.x Kamailio server.

I would suggest that you upgrade to a supported version (5.2.x/5.3.x).

The carrierroute module also supports a cfg file and can be used to in a somewhat consistent hash mode (you can shift the load of one server to another one without changing the distribution set completely) – if you can’t upgrade right now this might be as well an option for you.

Cheers,

Henning

--
Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com<https://gilawa.com/>
Kamailio Merchandising – https://skalatan.de/merchandising

From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Barry Flanagan
Sent: Thursday, November 14, 2019 2:01 PM
To: SIP Router - Kamailio (OpenSER) and SIP Express Router (SER) - Users Mailing List <sr-users at lists.sip-router.org>
Subject: [SR-Users] dispatcher, pvar_hash and multiple kamailio instances

Hi,

I have multiple Kamailio instances using dispatcher using alg “7” - hash over the content of PVs string, both using the same dispatcher list.

Is it reasonable to expect both Kamailio, given the same hash_pvar, to select the same host from the same set?
Looking at the source I do not see any reason why not, but I am getting different results from the two Kamailio servers. The only difference between them is different minor version numbers - 4.3.4 and 4.3.7

I want to ensure that calls with the same hash_pvar value go to the same backend no matter which Kamailio processes the request.

Thanks!

-Barry Flanagan




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