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Cloned from launchpad blueprint https://blueprints.launchpad.net/swift/+spec/data-deduplication. Description: data deduplication for swift As everybody knows that Swift will default redundant object 3 times. Once I upload a file, and then I rename the file to re-upload again,the object servers will create another object 3 times. This is not only a waste of storage space, and a waste of bandwidth. Specification URL (additional information): http://en.wikipedia.org/wiki/Data_deduplication