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Efficient chunking algorithm

Inactive Publication Date: 2006-03-02
MICROSOFT TECH LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] Briefly stated, the present invention is related to a method and system for chunking an object. A method and system are arranged to provide efficient chunking of objects such that objects can be efficiently updated between a remote machine and a local machine over a network. The chunking algorithm is applicable in networked application such as file synchronization using remote differential compression (RDC) techniques. The chunking algorithm provides enhanced efficiencies by locating chunk boundaries around local maxima.

Problems solved by technology

As a result of limited network bandwidth, users can experience long delays in retrieving and transferring large amounts of data across the network.
The benefits of RDC are most significant in the case where large objects need to be communicated frequently back and forth between computing devices and it is difficult or infeasible to maintain old copies of these objects, so that local differential algorithms cannot be used.

Method used

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Examples

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example process

Flow

[0062]FIGS. 4A and 4B are diagrams illustrating process flows for the interaction between a local device (e.g., device A) and a remote device (e.g., device B) during an example RDC procedure that is arranged in accordance with at least one aspect of the present invention. The left hand side of FIG. 4A illustrates steps 400-413 that are operated on the local device A, while the right hand side of FIG. 4A illustrates steps 450-456 that are operated on the remote device B.

[0063] As illustrated in FIG. 4A, the interaction starts by device A requesting an RDC transfer of object OB in step 400, and device B receiving this request in step 450. Following this, both the local device A and remote device B independently compute fingerprints in steps 401 and 451, divide their respective objects into chunks in steps 402 and 452, and compute signatures (e.g., SHA) for each chunk in steps 403 and 453, respectively.

[0064] In step 454, device B sends the signature and chunk length list compute...

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Abstract

The present invention provides a method for chunking an object. The method is arranged to provide efficient chunking of objects such that objects can be efficiently updated between a remote machine and a local machine over a network. The chunking algorithm is applicable in networked application such as file synchronization using remote differential compression (RDC) techniques. The chunking algorithm provides enhanced efficiencies by locating chunk boundaries around local maxima.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to a method of chunking an object. More particularly, the present invention relates to a system and method for efficient chunking of objects such that objects can be efficiently updated between a remote machine and a local machine over a network. The chunking algorithm is applicable in networked application such as file synchronization using remote differential compression techniques. The chunking algorithm provides enhanced efficiencies by locating chunk boundaries around local maxima. BACKGROUND OF THE INVENTION [0002] The proliferation of networks such as intranets, extranets, and the internet has lead to a large growth in the number of users that share information across wide networks. A maximum data transfer rate is associated with each physical network based on the bandwidth associated with the transmission medium as well as other infrastructure related limitations. As a result of limited network bandwidth, ...

Claims

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Application Information

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IPC IPC(8): G06F15/16
CPCH04L63/123G06F17/30194G06F16/182
Inventor GUREVICH, YURIBJORNER, NIKOLAJ S.TEODOSIU, DAN
Owner MICROSOFT TECH LICENSING LLC
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