Moving from Classic Mirrored queues to Quorum queues

[Ravindra Reddy Y]

Hi All,

I want to move from the classic queues to Quorum queues without touching the producer/consumer applications.

How can I move using RabbitMq Management UI?

Also Is there a way I can export the existing queue definition to create new one without the messages.

Thanks,

Ravindra

[Michal Kuratczyk]

Hi,

First and foremost: before attempting this, make sure your applications can actually work with quorum queues.

There are subtle differences in some behaviours and there's a feature not supported by quorum queues currently (priority queues).

There is no automated migration at this point: https://groups.google.com/g/rabbitmq-users/c/csO3or6_b-U/m/ey7ZuSzBBgAJ

Definitions can be exported (potentially modified) and imported: https://www.rabbitmq.com/definitions.html

If your applications declare queues, just importing modified definitions won't work, because what the application will try to declare won't match the existing definition. There's a currently somewhat hidden feature to avoid that - when declaring a vhost, you can specify the default queue type. This way if an application tries to declare a queue without specifying the type, it may get a quorum queue instead of a classic queue. Check --default-queue-type in `rabbitmqctl add_vhost` and https://github.com/rabbitmq/rabbitmq-server/pull/5305.

Best,

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Michał

RabbitMQ team