Publish message with max priority is not working as expected

[venkatesh N]

Hi Team,

Case 1:

We have tested below test case in RabbitMQ server 3.9

Step 1:  While creating queue ,we declared x-max-priority is 5

Step 2: We published messages with priority=9 ,priority= 5, priority=2 and priority=6 in this order.

Expected behavior after publishing messages: 

Priority order should be: 9  6   5   2

Observed behavior: 9  5   6   2 

Case 2:

Publish message with priority 256 is not throwing any exception.

priority range between 1 to 255 only(It is recommended). It is accepting priority higher than 255 also.

Can you please help us why RabbitMQ server is behaving like this.

Regards,

Venkatesh

[Sayed Hadi Rastgou Haghi]

Dear Venkatesh,

Hi,

As rabbit priority doc says, messages without a priority property are treated as if their priority were 0. Messages with a priority which is higher than the queue's maximum are treated as if they were published with the maximum priority.

Case 1:

So priorities  9  5  6 are treated as same priority (5). and  consumed in the same order you published  and as expected ( 9 5 2 6 --> 9 5 6 2 ) 

Case 2:

They are all expected as your queues max-priority property.

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Sincerely,

Sayed Hadi Rastgou Haghi