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Why does S3 require globally unique bucket names when it is created for region and not globally

 
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S3 buckets requires bucket names to be unique. But S3 buckets are created for particular region and not globally.Why does it require names to be globally unique then ? Thanks
 
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It's a design feature that S3 bucket names are globally unique, but the data has to physically go somewhere and you get to choose the region it gets stored in. That becomes important if you are dealing with data that needs to stay within a particular part of the World for legal or regulatory reasons.
 
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S3 was one of the first services Amazon Web Services provided, and they wanted a global namespace for simplicity. The first, and then only, S3 region was "US Standard" which is what's now us-east-1. They've since split it out into each of their regions, but kept the global namespace for backward compatibility.

Amazon keeps a lot of things for backward compatibility. S3 happened to be an early wild success, so they had a lot of users using it. Changing it to require specific regions would take a lot of work. Instead they're opting to follow a strangler pattern, where certain features are only available when you use region-specific URLs. However, they're keeping the global namespace for... backwards compatibility.
 
Monica Shiralkar
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Thanks
 
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