I think that RabbitMQ is a good tool to manage back pressure, unless you have a very huge amount of data that needs to be handled really fast to the workers to not saturate RabbitMQ itself.
And also, rabbit workers, adopt a “push” pattern, so by adopting a back pressure system like GenStage, where you “pull” messages from rabbit, you are using it in a really strange way. There is already prefetch count and prefetch size from the amqp protocol that works pretty well with back pressure.

I think that a postgres table (with Repo.stream) or a big file could be a better example. A situation where the amount of data that comes in could eventually saturate your application and slow everything down.

Thanks for the explanation. I did feel like I was trying to connect the positive ends of two magnets, but thought maybe there was some justification or specific use case.

maybe someone has an example where the two technologies could work well togheter. So far I didn’t find it

check out https://github.com/pma/wabbit.
its from the creator of the Elixir amqp module showing how to use it with gen_stage.

Yes. I saw this library earlier. However, I am curious if the library is necessary. Or if, as @matteosister states, does GenStage make sense with RabbitMQ.