Quorum Queues with single node

[Angshu Mukherjee]

Hi All,

Are there any known issues if we run quorum queues with a single node in production? 

        "Three nodes is the practical minimum of replicas for a quorum queue."

        "The minimum factor value that makes practical sense is three."

In the docs we see the above statement repeated a couple of times, so wanted to confirm.

The primary driving force behind this decision is two-fold:

1. Cost: Our entire deployment is single tenant, so for each customer we spin up new RabbitMQ instances. We have a lot of free tier customers, who are currently running a single node RabbitMQ instance. For them availability is not the top priority and we don't want to increase our infra costs to run 3 nodes for each of them when we move to quorum queues.

2. Maintainability: We want to completely migrate away from classic mirrored queues to quorum queues for all customers and don't want to maintain different application, installer and automation code for classic and quorum queues. 

Any suggestions would be highly helpful.

Best Regards,
Angshu
  

[Michal Kuratczyk]

Hi,

The docs you quoted were written with the assumption that if someone wants to use quorum queues, they want them replicated, hence the minimum replication factor of 3.

But if you don't need replication, running a single-node quorum queue is perfectly fine.

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Michal

RabbitMQ Team

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