Can we do write-object-if-not-exist in S3 similar to conditional put in Dynamo DB?

Question

I have a use case, where I need to avoid overriding the objects. I do understand that because of the distributed nature of the S3, it might not available. Are there any tricks and hacky way to achieve not to override the object in S3 ?

Dynamo DB is also distributed, but it provides conditional put. Wondering what is the architectural difference between Dynamo DB and S3 ?

Answer

S3 Natively does not have any conditions that would satisfy this for the [PutObject](https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObject.html) but what you could consider is making a [HeadObject](https://docs.aws.amazon.com/AmazonS3/latest/API/API_HeadObject.html) request first and if the object does not exist (404 - requires the writer to have s3:ListBucket permission) then continue with the PutObject.

Answer

Set an object lock https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-lock.html

Can we do write-object-if-not-exist in S3 similar to conditional put in Dynamo DB?

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