Mike just committed a read-only IndexReader recently. If you pull Lucene out of the svn trunk, you'll be able to make use of that. The r-o IR doesn't have a synchronized isDeleted, I believe.
Otis -- Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch ----- Original Message ---- > From: German Kondolf <[EMAIL PROTECTED]> > To: java-user@lucene.apache.org > Sent: Monday, August 25, 2008 4:58:00 PM > Subject: Re: FilteredQuery > > Exactly as Otis sais, you should use MatchAllDocs as query, but it has a > drawback in performance, it checks every single document deletion state, > I've solved the issue by making my own EnhancedMatchAllDocs query that is > optimized to do not check this document state. > > Perhaps the SegmentReader should be refactorized in some other way and not > be synchronized: > > public synchronized boolean isDeleted(int n) { > return (deletedDocs != null && deletedDocs.get(n)); > } > > With high level of concurrency this is an issue, there is a lot of > context-switching because of this line of code... > I didn't try an optimal solution, so I created my own EnhancedMatchAllDocs. > > Just copied the original class and replaced this call: > > public boolean next() { > while (id < maxId) { > id++; > if (!reader.isDeleted(id)) { > return true; > } > } > return false; > } > > For this simplified call: > > public boolean next() { > return (id++ < maxId); > } > > This change doesn't validate deleted documents, in my implementation it was > not a problem, so, it's possible that this solution doesn't work with any > other implementation. > Maybe it wouldn't be a problem if you flush your index often... > > GeR > > On Mon, Aug 25, 2008 at 2:38 PM, Otis Gospodnetic < > [EMAIL PROTECTED]> wrote: > > > Heiko, > > It's most likely because that B case has a purely negative query. Perhaps > > you can combine it with MatchAllDocs query? > > > > > > Otis > > -- > > Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch > > > > > > > > ----- Original Message ---- > > > From: Heiko > > > To: java-user@lucene.apache.org > > > Sent: Monday, August 25, 2008 11:29:22 AM > > > Subject: FilteredQuery > > > > > > Hi All, > > > > > > i would like to use the FilteredQuery to filter my search results with > > > the occurrence or absence of certain ids. > > > > > > Example A: > > > query -> text:"albert einstein" > > > filterQuery -> doctype:letter > > > > > > That's ok. I am getting the expected results. But i got no results, if > > > i filter with the absence of an id. > > > > > > Example B: > > > query -> text:"albert einstein" > > > filterQuery -> NOT doctype:article > > > > > > However following concatenation of filterQuery and query leads to the > > > expected result. > > > > > > Example C: > > > query -> text:"albert einstein" > > > filterQuery -> text:"albert einstein" NOT doctype:article > > > > > > I am confused that Example B does not worked. It is bug? > > > > > > I am using Lucene 2.3.2 and the following code fragement: > > > > > > Query query; > > > Query filterQuery; > > > ... > > > Filter filter = new CachingWrapperFilter(new > > > QueryWrapperFilter(filterQuery)); > > > FilteredQuery filteredQuery = new FilteredQuery(query, filter); > > > Hits hits = searcher.search(filteredQuery); > > > ... > > > > > > Thanks, > > > Heiko Müller > > > > > > > > > --------------------------------------------------------------------- > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
