A survey of web archive search architectures
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1 A survey of web archive search architectures Miguel Costa, Daniel Gomes (Portuguese Web Francisco Couto, Mário J. Silva (University of Lisbon)
2 The Internet Archive was founded in 1996 Web-archived page of the first Web Archive
3 Web archiving has been growing 77 web archiving initiatives 282 billion web-archived files
4 Web archives must be searchable Users demand Google-like search Searchable means at least full-text search Unsearchable=Useless
5 How to enable web archive search? Our pursued answer since 2001
6 Research on web archiving (2001) A web archive of online publications Project between the University of Lisbon and the National Library of Portugal
7 Research on search engines (2001) Portuguese-web search engine
8 Portuguese Web Archive = Web search + Web archiving
9 Survey about web archiving initiatives (2011) URL search: 89% Meta-data search: 79% Full-text search: 67% (28 initiatives) The knowledge is out there
10 For this survey of web archive search architectures Identified prevalent search architectures Compared main features based on: Available publications (still few) Our experience
11 Portuguese Web Archive Based on NutchWAX Archive-access tools are widely used to support search Full-text search over 1.2B docs at archive.pt
12 Search workflow Machine 1 Query Server Index partition 1 Query Query Broker Machine 2 Query Server Machine N Query Server Index partition 2 Index partition N For large collections, indexes must be partitioned across several machines
13 Time, document partitioning (PWA) document identifiers Advantages Selects time partitions according to query timespan Progressive degradation All computers have all terms One partition fails, remaining respond to query term No index rebuilding required to add new collections lexicon after boat car... you zebra <3,1> Disadvantages <2,1> <5,2> <1,3> <4,2> <2,1> <4,1> xbox <5,1> document-based partition (1-2) document-based partition (3-4) High workload: all document partitions within timespan must be scanned for each query Centralized data center approach
14 Everlast P2P architecture Different types of nodes Crawlers Version directories Indexes Low cost nodes Full-text search Unlimited scalability Tested in laboratory
15 Term, time partitioning (Everlast) document identifiers lexicon after boat car dad <3,1> <2,1> <5,2> <1,3> <4,2> <2,1> <4,1>... <5,1> term-based partition (a-b) term-based partition (c-d) Advantages Robustness of decentralized architecture Lower workload: only one term partition is contacted for each query Disadvantages Index updates to add new collections Term partition unreachable may prevent response to query term Redundancy required Latency due to network
16 Wayback Machine (URL search) Doesn t use inverted indexes Flat sorted files of URLs URL partitioning Advantages High throughput with millions of queries daily Easy to manage: no phd required Disadvantages High communication workload because all queries are broadcasted to all index partitions Limited search features
17 Overall comparison Search requirement Storage and workload scalability Wayback Machine Portuguese Web Archive Everlast High High Very High Service reliability High High Medium Time-aware indexing Performance of response times and throughput No Yes Yes High Very High Medium None is the best, just different. Our objective was to improve documentation about web archive search
18 Food-for-thought
19 Problem for existing web archives Users don t know where to search for past web content Page unavailable means lost forever Dissemination of web archive services is expensive
20 It would be nice to have a single portal for cross-web archive search but Web-archived data is spread Search architectures are different Search technologies are different Interoperability is required
21 How to design a cross-web archive search architecture?
22 Our proposal: Web archive metasearch based on OpenSearch MyWebArchive search OpenSearch Web archive Metasearch Portal OpenSearch client YourWebArchive search OpenSearch Live-web search OpenSearch OpenSearch is a widely supported and simple technology Most web archives use NutchWAX and it supports OpenSearch Portal would be simple and cheap to implement Extremely useful to web users Increase visibility of web archiving initiatives Easily combines live-web with past-web search results
23 Successfully tested by Computer Science students Web applications that gather information about politicians from several sources: Wikipedia, Youtube, Twitter, Portuguese Web Archive
24 Web archive search easily integrated on web browsers
25 Required research to cross-web archive search Cross-web archive ranking algorithms How to rank search results? User interface design How to adequately present results from different sources?
26 Conclusions Web archives must support full-text search Web archive search architectures are different but search interoperability should be a requirement OpenSearch has potential to quickly enable cross-web archive search What do you think?
27 Contact us whenever you like Thanks.
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