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Fast file existence checking in archiving systems

Authors:

Vesna Pavlovic,

Jasna Milovanovic,

Veljko MilutinovicAuthors Info & Claims

ACM Transactions on Storage (TOS), Volume 7, Issue 1

Article No.: 2, Pages 1 - 21

https://doi.org/10.1145/1970343.1970345

Published: 27 June 2011 Publication History

Abstract

This article presents a new Fast Hash-based File Existence Checking (FHFEC) method for archiving systems. During the archiving process, there are many submissions which are actually unchanged files that do not need to be re-archived. In this system, instead of comparing the entire files, only digests of the files are compared. Strong cryptographic hash functions with a low probability of collision can be used as digests. We propose a fast algorithm to check if a certain hash, that is, a corresponding file, is already stored in the system. The algorithm is based on dividing the whole domain of hashes into equally sized regions, and on the existence of a pointer array, which has exactly one pointer for each region. Each pointer points to the location of the first stored hash from the corresponding region and has a null value if no hash from that region exists. The entire structure can be stored in random access memory or, alternatively, on a dedicated hard disk. A statistical performance analysis has been performed that shows that in certain cases FHFEC performs nearly optimally. Extensive simulations have confirmed these analytical results. The performance of FHFEC has been compared to the performance of a binary search (BIS) and B+tree, which are commonly used in file systems and databases for table indices. The results show that FHFEC significantly outperforms both of them.

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Cited By

Tong XCheng CWang RDing LZhang YLai GWang LChen B(2019)An efficient integer coding index algorithm for multi-scale time information managementData & Knowledge Engineering10.1016/j.datak.2019.01.003Online publication date: Feb-2019
https://doi.org/10.1016/j.datak.2019.01.003
Wei JJiang HZhou KFeng D(2014)Efficiently Representing Membershipfor Variable Large Data SetsIEEE Transactions on Parallel and Distributed Systems10.1109/TPDS.2013.6625:4(960-970)Online publication date: 1-Apr-2014
https://dl.acm.org/doi/10.1109/TPDS.2013.66
Rowe N(2014)Identifying Forensically Uninteresting Files Using a Large CorpusDigital Forensics and Cyber Crime10.1007/978-3-319-14289-0_7(86-101)Online publication date: 23-Dec-2014
https://doi.org/10.1007/978-3-319-14289-0_7
Show More Cited By

Index Terms

Fast file existence checking in archiving systems
1. Information systems
  1. Information retrieval
    1. Document representation

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Published In

cover image ACM Transactions on Storage

ACM Transactions on Storage Volume 7, Issue 1

June 2011

73 pages

ISSN:1553-3077

EISSN:1553-3093

DOI:10.1145/1970343

Issue’s Table of Contents

Copyright © 2011 ACM.

Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Association for Computing Machinery

New York, NY, United States

Publication History

Published: 27 June 2011

Accepted: 01 July 2010

Revised: 01 April 2010

Received: 01 December 2009

Published in TOS Volume 7, Issue 1

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Cited By

Tong XCheng CWang RDing LZhang YLai GWang LChen B(2019)An efficient integer coding index algorithm for multi-scale time information managementData & Knowledge Engineering10.1016/j.datak.2019.01.003Online publication date: Feb-2019
https://doi.org/10.1016/j.datak.2019.01.003
Wei JJiang HZhou KFeng D(2014)Efficiently Representing Membershipfor Variable Large Data SetsIEEE Transactions on Parallel and Distributed Systems10.1109/TPDS.2013.6625:4(960-970)Online publication date: 1-Apr-2014
https://dl.acm.org/doi/10.1109/TPDS.2013.66
Rowe N(2014)Identifying Forensically Uninteresting Files Using a Large CorpusDigital Forensics and Cyber Crime10.1007/978-3-319-14289-0_7(86-101)Online publication date: 23-Dec-2014
https://doi.org/10.1007/978-3-319-14289-0_7
Wang LZhang XZhu GZhu YDong X(2013)An Undirected Graph Traversal Based Grouping Prediction Method for Data De-duplicationProceedings of the 2013 14th ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing10.1109/SNPD.2013.34(3-8)Online publication date: 1-Jul-2013
https://dl.acm.org/doi/10.1109/SNPD.2013.34

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