zlacker

>>mpweih+(OP)
One important drawback of SQS is that it's eventually consistent, you can read the same message twice from different workers. Nevertheless we keep using it with additional checks when it's critical, it's still the cheapest solution by maintenance.

>>varela+Z9
Amazon's hand an answer to that with FIFO queues for the better part of years, but even without a queue based system you probably still need some notion of idempotence in the actions your system takes.

Systems "without queues" have just eschewed one queue for N queues, where N is the number of clients buffering actions for retries at any given moment.