multiple non-conflicting policies of same priority

[Gowri Sankar Suryanarayana]

Hello!

We have an existing policy on HA (set to ha-all) for the queues with the default priority (0)

Now, we're planning to create a new policy on Queue Master Locator (set to min-masters applying to Queues) with the default priority of 0 . Based on the experiments in test environments, it seems this new policy doesn't seem to be picked up. The MQs don't seem to have a uniform distribution

I've gone through this GitHub issue - https://github.com/rabbitmq/rabbitmq-server/issues/841

Is there a way we can make RabbitMQ honour the 2nd policy in addition to the 1st one? I'm guessing a higher priority (1 or more) will help but I want to know for sure

RabbitMQ Broker - 3.8.3

Erlang VM - 22.3.4.1

Please let me know if you need more info

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A.S.Gowri Sankar

[Ayanda]

Hello,

You can combine the 2 into a single policy, e.g.

rabbitmqctl set_policy my-ha-all-policy ".*" '{"ha-mode":"all","ha-sync-mode":"automatic", "queue-master-locator":"min-masters"}' --apply-to queues --priority 1

This will apply for new queues [1]. For active queues, use the rebalance command[2]. Only operator policies[3] can be merged to existing policies.

I suggest you set this config once off in the rabbitmq.conf file[4]. It's easier to manage: queue_master_locator = min-masters

[1] https://www.erlang-solutions.com/blog/take-control-of-your-rabbitmq-queues/

[2] https://www.rabbitmq.com/rabbitmq-queues.8.html#rebalance

[3] https://www.rabbitmq.com/parameters.html#operator-policies

[4] https://www.rabbitmq.com/configure.html#config-items

[Gowri Sankar Suryanarayana]

Thank you, Ayanda

I ended up combining the policies like you said. It worked well for new queues

I didn't know about the rebalance option. Is it sufficient that we execute this command on only one node in a given cluster

Thank you very much!

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A.S.Gowri Sankar

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[Diana Parra Corbacho]

Yes, rebalance needs to be called only once in one node

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[Gowri Sankar Suryanarayana]

Thank you, Diana

Do we need to take precautions when running this command while the message traffic is flowing in and out of the message broker?

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A.S.Gowri Sankar

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