[rabbitmq-discuss] basic.qos prefetch across multiple queues - useful?

Matthias Radestock matthias at rabbitmq.com
Mon Mar 18 18:30:29 GMT 2013

Is anybody setting a basic.qos prefetch limit on channels with consumers 
on multiple queues?

If so, are you relying on the fact that the prefetch limit applies 
*across* queues rather than *per* queue?

That feature entails considerable implementation complexity and has a 
substantial performance impact on consuming from basic.qos-limited 
channels in general. And I've just found a bug in that area of the code, 
fixing of which will make the implementation even more complex and hurt 
performance even more.

Hence I am trying to gauge people's opinion on whether we could make the 
prefetch limit apply per-queue instead.



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