AWS Certified Solutions Architect - Professional 2020

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Quiz Question – Half way through the upload, you try…to fetch the metadata.

I thought you could read an object that you’ve written immediately after you write it; regardless of propagation. At least that is the way I understood the explanation of S3’s approach to consistency in the course. I won’t deny that this seemed a little inconsistent with a later statement that seemed to be indicating that someone else trying to read my object won’t be able to until it has fully propagated.

1 Answers

To summarize from the link included in the quiz answer, "Amazon S3 provides read-after-write consistency for PUTS of new objects in your S3 bucket in all regions with one caveat. The caveat is that if you make a HEAD or GET request to the key name (to find if the object exists) before creating the object, Amazon S3 provides eventual consistency for read-after-write."

That is an important caveat in context to the quiz question.

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