NDLI: Two-Level Result Caching for Web Search Queries on Structured P2P Networks

Content Provider	IEEE Xplore Digital Library
Author	Rosas, E. Hidalgo, N. Marin, M.
Copyright Year	2012
Abstract	This paper proposes a two-level caching strategy for Web search queries which is devised to operate on P2P networks. The aim is to significantly reduce query traffic going from a large community of users to commercial search engines by placing between them a P2P caching service capable of storing and efficiently distributing frequent queries among users. The proposed design takes into consideration the highly dynamic nature of user queries both in traffic intensity and drastic shifts in user interest which are both usually driven by unpredictable world-wide events. Each peer maintains a LRU result cache (RCache) used to keep the answers for queries originated in the peer itself and queries for which the peer is responsible for by contacting on-demand a Web search engine to get the query answers. When query traffic is predominantly routed to a few responsible peers our strategy replicates the role of ``being responsible for" to neighboring peers so that they can absorb part of the traffic to restore load balance. This is a fairly slow and adaptive process that we call mid-term load balancing. To achieve a short-term fair distribution of queries we introduce in each peer a location cache (LCache) which keeps pointers to peers that have already requested the same queries in the very recent past. This lets these peers share their query answers with newly requesting peers. This process is fast as these popular queries are usually cached in the first DHT hop of a requesting peer which quickly tends to redistribute load among more and more peers. A comparative study shows that the proposed strategy achieves better load balance, significantly smaller communication volume among peers, and larger cache hit ratios than previous strategies.
Starting Page	221
Ending Page	228
File Size	456626
Page Count	8
File Format	PDF
ISBN	9781467345651
ISSN	15219097
e-ISBN	9780769549033
DOI	10.1109/ICPADS.2012.39
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-12-17
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Peer to peer computing Web search Engines Routing Search engines Load management Communities Distributed Hash Tables Web Search Engines Caching Services Load Balancing P2P networks
Content Type	Text
Resource Type	Article
Subject	Hardware and Architecture

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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