How does ZeroMQ Pub/Sub work?

How does ZeroMQ Pub/Sub work?

With pub-sub, it’s how the pattern can map cleanly to the PGM multicast protocol, which is handled by the network switch. In other words, subscribers don’t connect to the publisher at all, they connect to a multicast group on the switch, to which the publisher sends its messages.

What are the three messaging models provided by ZeroMQ messaging library?

ZeroMQ supports common messaging patterns (pub/sub, request/reply, client/server and others) over a variety of transports (TCP, in-process, inter-process, multicast, WebSocket and more), making inter-process messaging as simple as inter-thread messaging.

What is ZMQ communication?

ZeroMQ (also spelled ØMQ, 0MQ or ZMQ) is an asynchronous messaging library, aimed at use in distributed or concurrent applications. It provides a message queue, but unlike message-oriented middleware, a ZeroMQ system can run without a dedicated message broker. The library’s API is designed to resemble Berkeley sockets.

Can subscriber send ZMQ?

SUB can connect to multiple ZMQ. PUB (publishers). No single publisher overwhelms the subscriber.

What is Zmq proxy?

Description. The zmq_proxy() function starts the built-in ØMQ proxy in the current application thread. The proxy connects a frontend socket to a backend socket. Conceptually, data flows from frontend to backend. Depending on the socket types, replies may flow in the opposite direction.

Does ZMQ use TCP?

No it cannot. ZeroMQ is a messaging library and is not just a pure socket. It uses its own protocol called ZMTP and both endpoints are required to understand it.

What is context in ZMQ?

Contexts help manage any sockets that are created as well as the number of threads ZeroMQ uses behind the scenes. Create one when you initialize a process and destroy it as the process is terminated. Contexts can be shared between threads and, in fact, are the only ZeroMQ objects that can safely do this.

Where is ZMQ used?

asynchronous network messaging library
ZeroMQ is an asynchronous network messaging library known for its high performance. It’s intended use is for distributed systems as well as concurrent systems. In summary, ZMQ allows you to send messages (binary data, serialized data, simple strings, etc.)

Is Zmq slow?

Maybe ZeroMQ is just slow for this communication pattern and it excels in many-to-many communication patterns… Note: I “warmed” both middlewares before recording the results. Nevertheless ZeroMQ is always slower than Ice.

Is ZMQ a TCP or UDP?

ZeroMQ sockets provide a layer of abstraction on top of the traditional socket API, which allows it to hide much of the everyday boilerplate complexity we are forced to repeat in our applications. To begin, instead of being stream (TCP), or datagram (UDP) oriented, ZeroMQ communication is message-oriented.

What is a ZMQ subscriber?

The subscribers usually sets a filter on these topics for topic of their interests. Subscribers are created with ZMQ.SUB socket types. You should notice that a zmq subscriber can connect to many publishers.

How to use ZMQ xpub/XSUB with C++ pub?

C++ ZMQ example using PUB/SUB via a ZMQ XPUB/XSUB proxy. See about this. There are 3 programs zmq_proxy, zmq_producer and zmq_subscriber. The zmq_proxy creates the XPUB/XSUB proxy for the messaging, it will create the appropriate ports and sends a welcome message when clients connect to the XPUB socket.

Which scenario is more interesting in ZMQ?

It is scenario #1 which is more interesting. Just like ZMQ.REQ which can connect to multiple ZMQ.REP, ZMQ.SUB can connect to multiple ZMQ.PUB (publishers). No single publisher overwhelms the subscriber.

What is ZMQ_proxy and how to use it?

There are 3 programs zmq_proxy, zmq_producer and zmq_subscriber. The zmq_proxy creates the XPUB/XSUB proxy for the messaging, it will create the appropriate ports and sends a welcome message when clients connect to the XPUB socket.

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