Cloud storage using Merkle trees
First Claim
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1. A method, comprising:
- locating a Merkle tree of a stored object on a deduplicating block store;
comparing an object at a source location to the Merkle tree of the stored object;
determining change blocks for the object at the source location;
transmitting a message across a network to the deduplicating block store, the message including the change blocks and Merkle nodes that correspond to the change blocks; and
synchronizing the transmitted Merkle nodes for the change blocks with Merkle nodes of the Merkle tree of the stored object, wherein synchronizing comprises copying the Merkle nodes of the Merkle tree in bottom-to-top order to ensure that when a check of any Merkle node is performed that all child Merkle nodes associated with the Merkle node are present, further wherein upon encountering a missing Merkle node during the step of copying, pushing the missing Merkle node onto a stack.
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Abstract
Efficient cloud storage systems, methods, and media are provided herein. Exemplary methods may include locating a Merkle tree of a stored object on a deduplicating block store, comparing an object at a source location to the Merkle tree of the stored object, determining changed blocks for the object at a source location, and transmitting a message across a network to the deduplicating block store, the message including the change blocks and Merkle nodes that correspond to the change blocks.
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Citations
18 Claims
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1. A method, comprising:
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locating a Merkle tree of a stored object on a deduplicating block store; comparing an object at a source location to the Merkle tree of the stored object; determining change blocks for the object at the source location; transmitting a message across a network to the deduplicating block store, the message including the change blocks and Merkle nodes that correspond to the change blocks; and synchronizing the transmitted Merkle nodes for the change blocks with Merkle nodes of the Merkle tree of the stored object, wherein synchronizing comprises copying the Merkle nodes of the Merkle tree in bottom-to-top order to ensure that when a check of any Merkle node is performed that all child Merkle nodes associated with the Merkle node are present, further wherein upon encountering a missing Merkle node during the step of copying, pushing the missing Merkle node onto a stack. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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a processor; and logic encoded in one or more tangible, non-transitory media for execution by the processor and when executed operable to perform operations comprising; locating a Merkle tree of a stored object on a deduplicating block store; comparing an object at a source location to the Merkle tree of the stored object; determining change blocks for the object at a source location; transmitting a message across a network to the deduplicating block store, the message including the change blocks and Merkle nodes that correspond to the change blocks; and synchronizing the transmitted Merkle nodes for the change blocks with Merkle nodes of the Merkle tree of the stored object, wherein synchronizing comprises copying the Merkle nodes of the Merkle tree in bottom-to-top order to ensure that when a check of any Merkle node is performed that all child Merkle nodes associated with the Merkle node are present, further wherein upon encountering a missing Merkle node during the step of copying, pushing the missing Merkle node onto a stack. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method, comprising:
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generating a first Merkle tree for an object, the first Merkle tree comprising Merkle nodes that represent blocks of the object; examining an input data stream; generating a second Merkle tree for the object using the input data stream; comparing the first Merkle tree and the second Merkle tree to one another to determine changed Merkle nodes that do not correspond between the first Merkle tree and the second Merkle tree; transmitting data blocks that correspond to the changed Merkle nodes from a source location to a deduplicating block store; and synchronizing the transmitted Merkle nodes for the change blocks with Merkle nodes of the Merkle tree of the stored object, wherein synchronizing comprises copying the Merkle nodes of the Merkle tree in bottom-to-top order to ensure that when a check of any Merkle node is performed that all child Merkle nodes associated with the Merkle node are present, further wherein upon encountering a missing Merkle node during the step of copying, pushing the missing Merkle node onto a stack.
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Specification