[zeromq-dev] RFC 29 - PUBSUB clarification

Merijn Verstraaten merijn at inconsistent.nl
Tue Sep 9 09:44:46 CEST 2014


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?

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