[zeromq-dev] RFC 29 - PUBSUB clarification

[Merijn Verstraaten]

Also, it is very unclear what the following sequence of events should result in:

1. create socket
2. connect to host A
3. subscribe to FOO
4. connect to host B
5. subscribe to FOO

Does this result in 2 FOO subscriptions at A and 1 FOO subscription at B? What if a subscription message is silently dropped? How can I tell? If I unsubscribe from FOO am I supposed to only have 1 FOO subscription at A left? Again, what if an unsubscribe is dropped?

Cheers,
Merijn

On 09 Sep 2014, at 00:44 , Merijn Verstraaten <merijn at inconsistent.nl> wrote:
> Ola!
> 
> I was going over the PUBSUB RFC and the behaviour for XSUB specifies:
> 
> SHALL silently drop the message if the outgoing queue for a publisher is full.
> 
> Doesn’t this mean unsubscribe messages can silently be dropped? How can a sender ever be certain they successfully unsubscribed from a subscription? Especially given the fact that subscriptions are not idempotent, i.e. subscribing twice and having one of your two unsubscribe’s dropped will keep you subscribed?
> 
> Cheers,
> Merijn
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