Did you change any boost values for URL field or document while reindexing the document by any chance? Or do you look at different documents - one is internal id 0 and other is internal id 22 - this could be the updated one just curious if that might be the cause?!
simon On Mon, Oct 5, 2009 at 10:21 AM, Ole-Martin Mørk <olemar...@gmail.com>wrote: > Hi. I am trying to understand Lucene's scoring algorithm. We're > getting some strange results. First we search for a given page by it's > url. We get this result: > > 0.0014793393 = fieldWeight(url:"our super secret url" in 22), product of: > 1.0 = tf(phraseFreq=1.0) > 32.31666 = idf(url: www=7327 host=321 com=7327 article=2456 > something=2 something=44 704290075=1) > 4.5776367E-5 = fieldNorm(field=url, doc=22) > > When this is done, we use solrJ to read and write the document. The > only change is the title of the document (appends the number 2) > > We search again and the fieldNorm is changed significantly: > > 9.874598 = fieldWeight(url:"our super secret url" in 0), product of: > 1.0 = tf(phraseFreq=1.0) > 31.598713 = idf(url: www=7328 host=322 com=7328 article=2457 > something=3 somthing=45 704290075=2) > 0.3125 = fieldNorm(field=url, doc=0) > > Why does the value of fieldNorm change so much? > > Looking forward to your answers. > > -- > Ole-Martin Mørk > http://twitter.com/olemartin > http://flickr.com/olemartin >
