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Presented by Aleksey Shevchuk, Lead developer, odnoklassniki.ru
We will explain how search systems of social network Odnoklassniki work. Each day 40mln people use Odnoklassniki to communicate and entertain themselves. These activities are hard to imagine without proper search system. A dozen big index's and thousands of small indexes are responding to more than 4000 searches per second at peak times. Users can search within specific site sections of the site or the whole site. Search system will decide which indexes should be queried, and which results to show. To improve relevance we use information from social graph and various activity statistics available for indexed entities. Query log analysis? Again Lucene!