How to configure RabbitMQ to uniformly execute different types of tasks?

Question

Message Queues

There are users in the system, their number is unlimited and unknown. Each user can create a queue of tasks. There are a limited number of workers that must perform user tasks evenly.
For simplicity, let's take one worker and one system user who created 3 tasks.

user_id=1, task_id=1
user_id=1, task_id=2
user_id=1, task_id=3

One worker tasks will be executed sequentially. And it's all right.
Now suppose that the second user created his three tasks a millisecond later. In total, the worker will parse them in that order.

user_id=1, task_id=1
user_id=1, task_id=2
user_id=1, task_id=3
user_id=2, task_id=4
user_id=2, task_id=5
user_id=2, task_id=6

It is necessary to achieve behavior when, in the presence of many users, their tasks are performed evenly.

user_id=1, task_id=1
user_id=2, task_id=4
user_id=1, task_id=2
user_id=2, task_id=5
user_id=1, task_id=3
user_id=2, task_id=6

I tried to do this using the topic exchange, specifying the route key as task.USERID, then subscribed to task.*, but this resulted in the same task being delivered to all workers.
Perhaps I do not understand correctly how it works, or is a similar class of tasks solved differently?

Answer 1

It seems to me that Rabbit assumes sequential execution of tasks without options. This solution is for highload in the first place.
If distribution is important, then the workers work for a long time, which means the queue is not multi-million. What prevents to make this queue in Mysql, for example?