NDLI: COSTA: Adaptive Indexing for Terms in a Large-scale Distributed System

Content Provider	IEEE Xplore Digital Library
Author	Aoying Zhou Rong Zhang Quang Hieu Vu Weining Qian
Copyright Year	2008
Description	Author affiliation: Dept. of Comput. Sci. & Eng., Fudan Univ., Shanghai (Aoying Zhou; Rong Zhang)
Abstract	We introduce COSTA, for content-based search using term aggregation. Besides advantages shared with other P2P-based information retrieval systems, the system has several characteristics that distinguish itself from other systems: First, an adaptive indexing scheme which can dynamically identify important terms is used. Important terms are indexed in a chord-like ring, while other terms are aggregated in a balanced tree. We argue that this architecture is more flexible and suitable for term indexing than DHT-based methods. Furthermore, this structure allows to eliminate the requirement of maintaining global knowledge, and hence we can avoid the difficulty in maintaining such knowledge. Term aggregation is useful not only for performance enhancement, but also for improving the quality of search, by using of the term statistics information obtained via the aggregation. Traditional IR techniques such as query expansion can be utilized based on the information. Therefore, COSTA finely integrates distributed indexing with information retrieval. Advanced techniques, such as node clustering, caching and workload balance, are employed. We show that more existing optimization techniques can be adopted for further improvement of the system's performance.
Starting Page	1544
Ending Page	1547
File Size	2846031
Page Count	4
File Format	PDF
ISBN	9781424418367
DOI	10.1109/ICDE.2008.4497617
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-04-07
Publisher Place	Mexico
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Indexing Large-scale systems Peer to peer computing Statistics Tree data structures Delta modulation Quadratic programming Information retrieval Graphical user interfaces Samarium
Content Type	Text
Resource Type	Article

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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
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