zmq subscriber fails to receive message when subscriber is restarted
I have PUB/SUB program using zmq broker ( node.js ).
Subscriber doesn't receive messages while subscriber is restarted and publisher is still publishing the messages. But PUB/SUB is working fine when both publisher and subscriber services are started naturally. Reason behind this is unknown.
What could possibly be wrong?
While it is impossible to cover exactly a case of an undisclosed MCVE-design of using a PUB-archetype, on Publisher side, and an unspecified number of SUB-archetype nodes on the Subscribers' sides, there is one important fact.
The Design
Yes, the Design. Having read the API, user will be sure that
ZeroMQ does not guarrantee a message delivery
ZeroMQ
PUB-lisher does not wait and publishes a message for all connectedSUB-scribers, not waiting for late-joiners, nor providing any queue/persistence for not connectedSUB-scribers and discards all messages that were requested toPUB-lish during times there are noSUB-s connected.
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