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Does RabbitMQ support multiple consumers?
RabbitMQ has a plugin for consistent hash exchange. Using that exchange, and one consumer per queue, we can achieve message order with multiple consumers. The hash exchange distributes routing keys among queues, instead of messages among queues. This means all messages with the same routing key will go the same queue.
How many consumers can RabbitMQ have?
Single active consumer allows to have only one consumer at a time consuming from a queue and to fail over to another registered consumer in case the active one is cancelled or dies. Consuming with only one consumer is useful when messages must be consumed and processed in the same order they arrive in the queue.
Why do we need JMS queue?
JMS supports both messaging models: point-to-point (queuing) and publish-subscribe. JMS was defined to allow Java application to use enterprise messaging systems. More importantly, it provides a common way for Java applications to access such enterprise messaging systems.
What is a JMS queue?
JMS queue. A staging area that contains messages that have been sent and are waiting to be read (by only one consumer). As the name queue suggests, the messages are delivered in the order sent. A JMS queue guarantees that each message is processed only once.
What’s the difference between publish and subscribe in RabbitMQ?
In the previous tutorial we created a work queue. The assumption behind a work queue is that each task is delivered to exactly one worker. In this part we’ll do something completely different — we’ll deliver a message to multiple consumers. This pattern is known as “publish/subscribe”.
Can a RabbitMQ message be consumed by multiple consumers?
I have multiple consumers, which I would like to do different things with the same message. Most of the RabbitMQ documentation seems to be focused on round-robin, ie where a single message is consumed by a single consumer, with the load being spread between each consumer. This is indeed the behavior I witness.
What happens if there is no queue in RabbitMQ?
The messages will be lost if no queue is bound to the exchange yet, but that’s okay for us; if no consumer is listening yet we can safely discard the message.
Which is the best way to use RabbitMQ?
I am just starting to use RabbitMQ and AMQP in general. I have multiple consumers, which I would like to do different things with the same message. Most of the RabbitMQ documentation seems to be focused on round-robin, ie where a single message is consumed by a single consumer, with the load being spread between each consumer.