right, for docs with the same score, ties are broken by the internal Lucene ID. This may even change _on the same node_ due to merges!
If you want to control this, consider always specifying a secondary sort by, say, your id field if you have one, or date stamp or...... Best, Erick On Thu, May 22, 2014 at 8:58 AM, Nicola Buso <nb...@ebi.ac.uk> wrote: > Hi Uwe, > > thanks for the reply. > I see slightly different order in the results, and I was thinking are > docs with the same score and the difference between the two index (one > with "addIndexes" multithreaded and one no) is because of the order of > insert in the merged index; could be this the difference I see? > > > nicola. > > > On Thu, 2014-05-22 at 17:49 +0200, Uwe Schindler wrote: >> Hi Nicola, >> >> Yes, it is thread safe, like all other methods in IndexWriter. In the case >> of the one taking IndexReaders, Lucene will also do the merging concurrently. >> >> Say hello to Jo McEntyre! :-) >> 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: Thursday, May 22, 2014 5:13 PM >> > To: java-user@lucene.apache.org >> > Subject: IndexWriter.addIndexes() multithread correct? >> > >> > Hi, >> > >> > I was wondering if it's correct to call the method: >> > IndexWriter.addIndexes(...) >> > >> > from different threads concurrently. >> > >> > >> > nicola. >> > >> > >> > --------------------------------------------------------------------- >> > 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 > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
