NDLI: Index distribution technique for efficient search on unstructured peer-to-peer networks

Content Provider	IEEE Xplore Digital Library
Author	Lerthirunwong, S. Maruyama, N. Matsuoka, S.
Copyright Year	2008
Description	Author affiliation: Tokyo Inst. of Technol., Tokyo (Lerthirunwong, S.; Maruyama, N.; Matsuoka, S.)
Abstract	Resource indexing is an effective technique for fast, successful search on decentralized, unstructured peer-to-peer (P2P) networks. An index is a summary of resources owned by a node, and is distributed over the P2P network; any node having the index can answer queries on the location of the resources. While more thoroughly distributed indices can make queries answered more quickly with a small hop count, in large-scale networks, such a scheme may not be always effective due to the large space requirement for keeping indices at each node. We propose a new index distribution technique that aims to minimize the hop count required for each query by distributing indices over the network as uniformly as possible, but still in a space-efficient way. To do so, we compute the weight of each index that estimates how many unique resources each index can locate. We give a large weight to an index if it can locate many resources that others cannot. On the other hand, if a resource can be located from an index, we decrease the weights of other indices that can also locate it. Each node selectively keeps the indices with the largest weights, thus increasing the chance of successful queries at the node, while keeping the space requirement minimum. Simulation studies show that our distribution technique is effective in decreasing hop counts and messages needed for resolving queries. It decreases the average hop count by up to 44% with 75%-less messages when used with flooding based queries. Random-walk with our technique also decrease the average hop count by up to 58% with 82%-less messages. Furthermore, the query success rate with a limited timeout condition also increases, approaching nearly to 100%.
Starting Page	97
Ending Page	100
File Size	386410
Page Count	4
File Format	PDF
ISBN	9781424421015
DOI	10.1109/ECTICON.2008.4600381
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-14
Publisher Place	Thailand
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Algorithm design and analysis Peer to peer computing Conferences Search methods Indexes Floods Indexing
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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