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Overview of the Amazon S3 API (continued) API call API description A GET request operation on a requestPayment resource returns the request payment configuration of a bucket: either Payer or Requester. A GET location request operation using a bucket URI lists the location constraint of the bucket. This can be very important when verifying that you re complying with certain E.U. regulations pertaining to data on E.U. citizens. The DELETE request operation deletes the bucket named in the URI. All objects in the bucket must be deleted before the bucket itself can be deleted. Only the bucket owner can do this. The PUT request operation adds an object to a bucket. The response indicates that the object has been successfully stored. The COPY operation creates a copy of an object already stored in Amazon S3. Objects are fetched using the GET operation. This operation returns objects directly from Amazon S3 using a client/server delivery mechanism. The HEAD operation is used to retrieve information about a specific object or object size, without fetching the object itself. This is useful if you re only interested in the object metadata. The DELETE request operation removes the specified object from Amazon S3. Once deleted, there is no method to restore or undelete an object. The POST request operation adds an object to a bucket using HTML forms. This is an alternate form of PUT that enables browser-based uploads.
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HEAD Object
DELETE Object
POST Object
Now, let s look at some sample code using a few of these APIs, to see how simple they are to use. First, the S3 API call to GET the service requires authentication with a valid access key user_ID. Here s the request:
GET / HTTP/1.1 Host: s3.amazonaws.com Date: date Authorization: signature
And here s the response:
HTTP/1.1 200 OK x-amz-id-2: id x-amz-request-id: request_id Date: date Content-Type: type Content-Length: length
Designing for exponentially expanding storage
Connection: close Server: AmazonS3 < xml version="1.0" encoding="UTF-8" > <ListAllMyBucketsResult xmlns="http://doc.s3.amazonaws.com/2006-03-01"> <Owner> <ID>user_id</ID> <DisplayName>display_name</DisplayName> </Owner> <Buckets> <Bucket> <Name>bucket_name</Name> <CreationDate>date</CreationDate> </Bucket> ... </Buckets> </ListAllMyBucketsResult>
Next, the S3 API call PUT the request:
PUT / HTTP/1.1
Bucket creates a new bucket identified by request_id. Here s
Host: destinationBucket.s3.amazonaws.com Content-Length: 0 Date: date Authorization: signature
And here s the response:
HTTP/1.1 200 OK x-amz-id-2: id x-amz-request-id: request_id Date: date Content-Length: 0 Connection: close Server: AmazonS3
The S3 API call for reading an object uses GET object:
GET /destinationObject HTTP/1.1 Host: destinationBucket.s3.amazonaws.com Date: date Authorization: signature Range:bytes=byte_range
Object
with the
byte_range
of the
The response is as follows:
HTTP/1.1 200 OK x-amz-id-2: id x-amz-request-id: request_id Date: date Last-Modified: Sun, 1 Jan 2006 12:00:00 GMT ETag: "etag" Content-Length: length Content-Type: type
CHAPTER 5 Connection: close Server: AmazonS3 file_content
Designing and architecting for cloud scale
These code fragments demonstrate that each of the calls is simple and conforms to the standard HTTP GET and PUT structure. Each also has a Simple Object Access Protocol (SOAP) formulation as well as these RESTful versions.
Costs
Detailed cost information is available from each cloud storage vendor, but Amazon is setting the ceiling, and that ceiling is already low. Roughly, storage of a modest size (under 50 TB) runs $0.15/GB/month with an additional $0.10/GB data transfer in and $0.17/GB data transfer out. Amazon ties its services together by making transfers between S2 and EC2 free. All costs are higher for buckets located in Europe. As low as these numbers look, be careful, because large-volume long-term storage can turn out to be very expensive. For example, to store 1 PB (remember, that s a quadrillion bytes or 1,000 TB or 1 million GB) on the cheapest commodity raw drives costs about $81,000. On EMC s NS-960, this would cost $2,860,000; and on Amazon S3 for three years, it would cost $2,806,000. That s not a typo! Granted, a petabyte is a lot of data; but as you saw at the beginning of this section on storage, the big video- and photo-sharing sites routinely get up to the petabyte levels. S3 is about raw storage with no structure and no structured way for it to interact with applications running in the cloud. One type of storage structure that has been built on top of S3 is the ability to mount a file system so that applications think they re dealing with a file system as if they had formatted disk drives attached to each server.
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