On 07/06/2010 11:17 AM, Pete Zaitcev wrote:
On Tue, 6 Jul 2010 03:24:29 -0400
Jeff Garzik<jeff@xxxxxxxxxx> wrote:
The following patch, against current hail.git, adds the "CP" command to
chunkd, permitting copying from object->object inside a single table.
What is it for?
Here's a real-world example.
Quoting from the S3 documentation, this describes the "PUT (copy)"
operation, something that tabled does not yet support, but should:
This implementation of the PUT operation creates a copy of an
object that is already stored in Amazon S3. A PUT copy
operation is the same as performing a GET and then a PUT.
Adding the request header, x-amz-copy-source, makes the PUT
operation copy the source object into the destination bucket.
Assuming that a given tabled object is already fully replicated --
HOPEFULLY the common case for us -- the least expensive way to implement
this is
for each chunkd containing object OLD_KEY
CHO_CP(object OLD_KEY -> object NEW_KEY)
Assuming each chunkd node has the necessary free space, this method
totally avoids using network bandwidth, when creating a copy of an object
Jeff
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