RMQ 4.2.4 OR 4.3

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Sravani Cheruvu

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Apr 29, 2026, 12:27:13 AM (10 days ago) Apr 29
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Hi Team,

We have been using RMQ 3.12.13 classic queues and we have been using message priority at individual message and use x-max-priority at queue declare level.

Now we have upgraded to 4.2.4 and quorum queues ,  and we are not able to use individual priorities in this version. We are fine with avoiding x-max-priority but we need priority feature in quorum queues


Please help us with this , how to implement this in latest version in quorum queues.



Michal Kuratczyk

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Apr 29, 2026, 1:49:10 AM (10 days ago) Apr 29
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Priority support was added to QQs in 4.0 but up to (including) 4.2, they worked quite differently than in CQs:

Starting with 4.3, QQ priorities are more similar to how CQs implemented them (strict priority):
https://www.rabbitmq.com/blog/2026/04/23/rabbitmq-4.3-release#32-message-priorities

In either case, you don't set x-max-priority. - you just set the priority when publishing a message and that's it.

So, it sounds like the 4.3 behaviour is what you are looking for.

We could not introduce strict priorities earlier because Ra didn't support compaction. Not consuming lower priority messages would have led
to unbounded disk usage growth since we had to keep everything since the oldest unconsumed message. Starting with 4.3, Ra
can compact the segment files to only keep what is still needed (eg. lower priority messages without all the other ones).

Best,

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Sravani Cheruvu

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Apr 30, 2026, 12:35:22 AM (9 days ago) Apr 30
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Hi Team,

Thankyou for the info.

Reg the message level priority  , so we can set the message priority while publishing the message ? could you explain the behaviour , what happens if 100 messages with same priority , ex. Priority =5 reaches server at same time?

Also could you confirm , if this feature is not possible in 4.2.4 ??

Thanks,
Lakshmi.


Michal Kuratczyk

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Apr 30, 2026, 3:43:06 AM (9 days ago) Apr 30
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so we can set the message priority while publishing the message ?

Of course. What other options could even be there?
 
what happens if 100 messages with same priority , ex. Priority =5 reaches server at same time?

It's just as if priorities were not used - first in, first out.

Also could you confirm , if this feature is not possible in 4.2.4 ??
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