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Recently started looking into these AMQP (RabbitMQ, ActiveMQ) and ZeroMQ technologies, being interested in distributed systems/computation. Been Googling and StackOverflow'ing around, couldn't find a definite comparison between the two.
The farthest I got is that the two aren't really comparable, but I want to know the differences. It seems to me ZeroMQ is more decentralized (no message broker playing middle-man handling messages/guarenteering delivery) and as such is faster, but is not meant to be a fully fledged system but something to be handled more programmatically, something like Actors.
AMQP on the other hand seems to be a more fully fledged system, with a central message broker ensuring reliable delivery, but slower than ZeroMQ because of this. However, the central broker creates a single point of failure.
Perhaps a metaphor would be client/server vs. P2P?
Are my findings true? Also, what would be the advantages, disadvantages, or use cases of using one over the other? A comparison of the uses of *MQ vs. something like Akka Actors would be nice as well.
EDIT Did a bit more looking around.. ZeroMQ seems to be the new contender to AMQP, seems to be much faster, only issue would be adoption/implementations?
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Performance. ZeroMQ: ZeroMQ is much faster than RabbitMQ because it doesn't store messages on the disk, so you don't need to go back and forth to get messages. It stores messages in memory in small buffers. RabbitMQ: RabbitMQ promotes broker functionality; that is, it supports message persistence, so it is slower.
ZeroMQ and RabbitMQ both support an open messaging protocol called AMQP. The advantage to AMQP is that it's designed to be a highly-robust and open alternative to the two commercial message queues out there (IBM and Tibco). However, ZeroMQ doesn't support message persistence across crashes reboots.
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 zero in the name is for zero broker.
AMQP is the core protocol for RabbitMQ (a Message Broker), but it also supports STORM, MQTT and HTTP through the use of plugins. HTTP — you're probably familiar with this one. It is not a messaging protocol, but management plugins in RabbitMQ use HTTP to send and receive messages.
Here's a fairly detailed comparison of AMQP and 0MQ: http://www.zeromq.org/docs:welcome-from-amqp
Note that 0MQ is also a protocol (ZMTP) with several implementations, and a community.
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