If you want relevance sorting (Sort.Score not Sort.Relevance right?), I'd think you want to use TopScoreDocCollector, not TopFieldCollector. The only reason to use relevance with TopFieldCollector is if you you are doing a nth sort with a field sort as well.
You don't really need to worry about things like turning off the max score tracking here - its just going to be the first doc on the queue. You also do want to specify whether or not to collect docs in order if you care about performance: public static TopScoreDocCollector create(int numHits, boolean docsScoredInOrder) ie: TopScoreDocCollector.create(nDocs, !weight.scoresDocsOutOfOrder()); Which means you just want option 1. -- - Mark http://www.lucidimagination.com eks dev wrote: > Hi All, > > What is the best way to achieve the following and what are the differences, > if I say "I do not normalize scores, so I do not need max score tracking, I > do not care if hits are returned in doc id order, or any other order. I need > only to get maxDocs *best scoring* documents": > > OPTION 1: > TopDocs top = ixSearcher.search(q, filter, maxDocs); > > OPTION 2: > final TopScoreDocCollector tfc = TopScoreDocCollector.create(maxDocs, > false); > ixSearcher.search(q, filter, tfc); > TopDocs top = tfc.topDocs(); > > > OPTION 3: > final TopFieldCollector tfc = TopFieldCollector.create(Sort.RELEVANCE, > maxDocs, > false /* fillFields */, > true /* trackDocScores */, > false /* trackMaxScore */, > false /* docsInOrder */); > > ixSearcher.search(q.weight(ixSearcher),filter, tfc); > TopDocs top = tfc.topDocs(); > > > what are the pros and cons? > If I read javadoc correctly, > - OPTION 1 tracks max score and delivers doc Ids in order (suboptimal > performance for my case) > - OPTION 2 I do not know abut max score tracking, but doc Ids are not > required to be in order > - OPTION 3 looks like exactly what I want, but one performance comment in > javadoc about Sort.RELEVANCE made me think if that is the fastest way? > > What would be recommended here, any other options to achieve the fastest > search with above defined conditions (no max score tracking and doc id order > irrelevant)? OPTIN2 looks nice, but as said, I am not sure about max score > tracking? > > Thanks, > eks > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
