Hello,

dmq is designed to work only between kamailio nodes that have the same major version (e.g., only between kamailio 5.7.x nodes).

That's because even on the network the data may look the same, the internal structures, types of fields, sizes and meaning of values can be different. This is similar to how the major storage systems require nodes in the same replication group.

A note about it is in the docs:

- https://www.kamailio.org/docs/modules/stable/modules/dmq.html#idm39

To detect different versions in the same cluster, you can eventually look at the User-Agent header (or Server for replies).

Cheers,
Daniel

On 29.11.23 12:51, Denys Pozniak via sr-users wrote:

Hello!

I noticed that there are differences in the DMQ htable replication protocol for the old version of Kamailio 5.2 and the new 5.7.
For example, the new version uses action 2 when updating values and action 4 to remove.

The old Kamailio version uses the values 1 and 3 respectively.

Well, as a result, the htable data is not shared between such nodes, plus there are errors in the syslog of the old version:

ERROR: htable [ht_dmq.c:328]: ht_dmq_handle_msg(): failed to replay action

It would probably be worth introducing some kind of DMQ htable protocol versioning to maintain compatibility?
And is there any option to make them work together (I wouldn’t really want to change the action number in sip/sdp/json on the fly)?

Kamialio 5.2

{"action":1,"htname":"shared","cname":"user","type":2,"strval":"uri","mode":1}
{"action":3,"htname":"shared","cname":"user","mode":0}

Kamailio 5.7
{"action":2,"htname":"shared","cname":"user","type":2,"strval":"uri","mode":1}
{"action":4,"htname":"shared","cname":"user","mode":0}
--

BR,

Denys Pozniak
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