I have published an InfoQ news post about AWS's new ordered exactly-once Amazon SQS processing mode:
Amazon's Simple Queue Service (SQS) recently gained FIFO (first-in, first-out) queues, which are designed to "guarantee that messages are processed exactly once, in the order that they are sent, and without duplicates". AWS rolled out this new queue type in the US East (Ohio) and US West (Oregon) regions and "plans to make it available in many others in early 2017".
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