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< Infrastructure

Revision as of 10:33, 28 October 2009 by Huzaifas (talk | contribs) (In Progress)

Infrastructure InfrastructureTeamN1.png

Points of Contact

Project Sponsor

Name: Mike McGrath
Fedora Account Name: mmcgrath
Group: Infrastructure
Infrastructure Sponsor: mmcgrath

Secondary Contact info

Name: Huzaifa Sidhpurwala
Fedora Account Name: huzaifas
Group: Infrastructure

Name: Allen Kistler
Fedora Account Name: akistler
Group: Infrastructure

Project Info

Project Name: Search Engine Enhancement
Target Audience: All users of Fedora web sites
Expiration/Delivery Date (required): F13


Fedora needs a search engine[1]


  • Crawl the web sites (wiki and non-wiki)
  • Search the web sites (wiki and non-wiki)


  • Python-based (no Java)
  • Programmable keywords to have control over what pages get displayed for certain keywords
  • XML or library interface so other applications can use it

Project Plan

  1. Investigate and evaluate existing open source search engines
  2. Select candidate software
  3. Create public test instance of candidate software
  4. Test for functionality, performance, and impact (re-evaluate, if necessary)
  5. Create capacity and deployment plans
  6. Deploy

Resources Needed

  • Public Test for testing candidate software
  • Permanent home(s) for deployment
    • Web server(s)
    • Database server(s)

Software Investigation and Evaluation

In Progress

  • DataparkSearch [2]
written in C
written in C/C++
written in C++
  • KinoSearch [5] - Allen investigating
  • Description
Perl/C port of Lucene
Maintainer Rectangular Research appears to be just one guy, who considers KinoSearch to be alpha software
KinoSearch and Ferret intend to merge as Lucy [6]
  • Evaluation
Search engine library with sample indexer and search page rather than fully-functional application. Stores indices in Berkeley DB files with JSON format specifications. Allows custom-designed indices. Each document source is indexed as a single write-once index, which is a directory. Rerunning the indexer creates a new directory, obsoleting the old directory if all the old documents are included. The old directory then needs to be cleaned up. Postings can, however, be deleted from an index. Additionally, only the new documents can be indexed, but that's not efficient.
  • Requirements
  • gcc
  • (EPEL) perl-Module-Build
  • (EPEL) perl-JSON-XS
Problem: Desires 1.53, but EPEL has 1.43
Note: works with 1.43, anyway
  • (EPEL) perl-Lingua-Stem-Snowball
  • (EPEL) perl-Lingua-StopWords
  • (EPEL) perl-Parse-RecDescent
sample indexer reads files from the file system and requires
  • (EPEL) perl-HTML-Tree
sample cgi search script requires
  • (CPAN) Data::Pageset (which requires Data::Page)
  • (EPEL) perl-Test-Exception
  • (EPEL) perl-Class-Accessor-Chained
  • mnoGoSearch [7]
written in C
  • Namazu [8] - Huzaifa investigating
written in Perl
written in C
Swish++ is a rewrite in C++
written in C++
Bindings to Python, Perl, PHP, Ruby, Java, and more
Omega (builtin) provides a more complete search engine experience on top of core Xapian
Built-in web crawler is a script that interfaces with ht://Dig
Flax [11] is another search engine built on top of Xapian and CherryPy
  • YaCy [12] - Examined by Huzaifa
written in Java
  • Well maintained
  • Support for peer search engine database exchanges
  • Customised search parameters
  • Fast indexing and web interface for querying the backend db.
written in C

Not Suitable

written in Java
Ruby port of Lucene
KinoSearch and Ferret intend to merge as Lucy [6]
written in C#
  • written in Java
  • archives content rather than simply indexing it
  • written in C++
  • not actively maintained
It's just a MediaWiki plugin, not suitable for searching non-wiki sites
written in Java, but ported to others [21]
  • Requires EzMwLucene (Java, not desirable) to be running on the servers to be searched
  • EzMwLucene is wiki-only, therefore MWSearch is wiki-only
  • written in Java
  • based on Lucene
  • written in Perl or TCL on top of PostgreSQL
  • Python interface available
  • not actively maintained
  • Perl port of Lucene
  • not actively maintained
  • RigorousSearch [26]
Crawls the MediaWiki database, not the web site
Doesn't work for non-MediaWiki web sites, including any non-wiki web site
written in C++
designed to index SQL tables, not web pages.
Written in C++
Wiki-only (?)
  • Terrier (TERabyte RetrIEveR) [29]
written in Java

Public Testing


Deployment Plan



  1. "Fedora Search Engine". Infrastructure/Tickets. 
  2. "DataparkSearch". DataparkSearch. 
  3. "Indri". The Lemur Project. 
  4. "Isearch". Isite. 
  5. "KinoSearch". Rectangular Research. 
  6. 6.0 6.1 "Lucy". Apache Software Foundation. 
  7. "mnoGoSearch". LavTech. 
  8. "Namazu". Namazu Project. 
  9. "Swish-e". Swish-e. 
  10. "Xapian". Xapian Project. 
  11. "Flax". Flax. 
  12. "YaCy". Karlsruhe Institute of Technology. 
  13. "Zettair". Search Engine Group, Royal Melbourne Institute of Technology. 
  14. "Egothor". Egothor. 
  15. "Ferret". David Balmain. 
  16. "Grub". Wikia, Inc.. 
  17. "Heritrix". Internet Archive. 
  18. "ht://Dig". The ht://Dig Group. 
  19. "HtdigSearch Extension". MediaWiki. 
  20. "Lucene". Apache Software Foundation. 
  21. "Lucene Implementations". Apache Software Foundation. 
  22. "MWSearch Extension". MediaWiki. 
  23. "Nutch". Apache Software Foundation. 
  24. "OpenFTS". SourceForge. 
  25. "Plucene". CPAN. 
  26. "RigorousSearch Extension". MediaWiki. 
  27. "Sphinx". Sphinx Technologies. 
  28. "SphinxSearch Extension". MediaWiki. 
  29. "Terrier". Terrier Project.