16 Jan
2018
16 Jan
'18
12:17 a.m.
It’s a valid alternative, and one which works well if the subscribers are not in direct
contact with the presence servers and instead there’s a load balancer in-between.
Where subscribers are in direct contact and also behind NAT the NOTIFYs will need to go
via the server on which the subscription was received.
Also, it is assumed that there are typically more subscriptions than presentities.
This not only adds more internal traffic (proportional to the number of nodes), but also a
dependency on each server for the lifetime of its ‘own’ watcher records.
If each node is responsible for its own subscribers, however, then if it disappears the
subscribers simply move elsewhere (as a result of dead keepalive)
The main purpose of the replication is to enable each
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