We are looking for some thoughts and advise on our PUB-SUB setup and EPGM messages which do arrive at their destination (tcpdump based) but are never offered as events to our subscriber.
Our setup: - We have 3 publishers with different source IPs (PHP processes which restarts after sending 100 messages) - Subscriber is a NodeJS process - Publisher and Subscriber use libzmq v4.0.5 - Subscriber uses node.js zmq bindings (https://www.npmjs.com/package/zmq) - Message rate ~ 50/s - Publisher and subscriber are in the same broadcast domain Our observations: - For random topics, random messages are not received by the subscriber - A message that is not received by the subscriber (never offered as an event to the nodejs process) is seen by tcpdump so we don’t face packet loss. Subscriber tuning we did so far: - Set ZMQ_RCVHWM to 0 Any thoughts on where we should look or what we should do? -- Bart van Wissen
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