On SQS

You can even just ignore them; there are people who’ll dump a few million messages onto a queue and almost never retrieve them, except when something goes terribly wrong and they need to recover their state. The proportion of services I work on where queues are absolutely necessary rounds to 100%. With a whole bunch of heroic work, we might be able to cram together all these services into a smaller number of packages, but I’d be astonished if that were a cost-effective piece of engineering.

Source: www.tbray.org