Hi, The ConstantScoreQuery part is just overhead. If scores are not requested, they should not be calculated - but CSQ cannot prevent this from happening at all. It just prevent's the collector from seeing the scores. As the counting collector does not request any scores, you just add a useless additional wrapper around the query's scorer.
Uwe ----- Uwe Schindler H.-H.-Meier-Allee 63, D-28213 Bremen http://www.thetaphi.de eMail: u...@thetaphi.de > -----Original Message----- > From: Nicola Buso [mailto:nb...@ebi.ac.uk] > Sent: Wednesday, September 18, 2013 5:21 PM > To: java-user > Subject: TotalHitCountCollector performance > > Hello, > > I was going to use the TotalHitCountCollector in cases where I'm interested > just in the number of results. > Obviously I was hoping to gain in performances compared to a "scored" > query. > From my tests it seam it's not so performant compare to the "scored" > search. At this point I'm wondering if I'm doing some errors. > I'm executing 1000 queries on an index with 167,424,681 entries: > TotalHitCountCollector average is 2803.34 TopFieldCollector average is > 2981.47 > > Below is part of the code I'm using with TotalHitCountCollector, with > TopFieldCollector I'm not wrapping the query with ConstantScoreQuery > > Does these numbers resemble right to you guys? > > > > nb. > > > > --------- > // prepare the lucene query. > final org.apache.lucene.search.Query luceneQuery = new > ConstantScoreQuery(getQuery(queryDomain, query.getQueryString())); > > try { > final TotalHitCountCollector hitCountCollector = new > TotalHitCountCollector(); > > long startTime = System.currentTimeMillis(); > searcher.search(luceneQuery, hitCountCollector); > if (log.isTraceEnabled()) { > log.trace(String.format("getNumberOfResults query=%s, domainId=%s > executed in: %s(ms)", > query.getQueryString(), > query.getDomainId(), > System.currentTimeMillis() - startTime)); > } > return hitCountCollector.getTotalHits(); } catch (final IOException e) { > throw new SearchFailedException("I/O [" + this.domain + "] " + > e.getMessage(), e); } > > > --------------------------------------------------------------------- > 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
