If you are working with AWS services, particularly S3, you might have encountered S3's eventual consistency model (or you'll eventually encounter it). This post here describes concisely the eventual consistency issue. We have similar systems, where data is published to S3 and then notified to an online system about its availability using a messaging bus. There have been occasions when the message has been consumed by an online service to later discover that the S3 data was still not accessible.
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