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How the Amazon SQS FIFO API Works | AWS Developer Blog

aws.amazon.com/blogs/developer/how-the-amazon-sqs-fifo-api-works

From the page

Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.

We have just introduced FIFO queues for Amazon SQS. These queues offer strictly ordered message delivery and exactly-once message processing. The FIFO API builds on the SQS API and adds new capabilities. This post explains the additions, how they work, and when to use them.