Hi Uwe, thanks for the fast reply. I removed the CSQ and checked again my test, still there is mainly no difference with searching with TopFieldCollector.
Just a clarification; the method getQuery(...) in my code is returning a BooleanQuery, where the user input is expanded on some of the fields present in the index. Doing some profiling of the test I see the IndexSearcher end up calling the BooleanScorer that take most of the time of the search execution. Is this normal? can I configure the BooleanQuery to avoid the scorer to be called like using disablecoords? Nicola. On Wed, 2013-09-18 at 18:15 +0200, Uwe Schindler wrote: > 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
