On Sep 7, 2010, at 7:08 AM, Alessandro Benedetti wrote: > Hi all, > I need to retrieve query-results with a ranking independent from each > query-result's default lucene score, which means assigning the same score to > each query result. > I tried to use a zero boost factor ( ^0 ) to reset to zero each > query-result's score. > This strategy seems to work within the "example" solr instance, but in my > Solr instance, using a zero boost factor causes a Buffer Exception > ( > HTTP Status 500 - null java.lang.IllegalArgumentException at > java.nio.Buffer.limit(Buffer.java:249) at > org.apache.lucene.store.NIOFSDirectory$NIOFSIndexInput.readInternal(NIOFSDirectory.java:123) > at > org.apache.lucene.store.BufferedIndexInput.refill(BufferedIndexInput.java:157) > at > org.apache.lucene.store.BufferedIndexInput.readByte(BufferedIndexInput.java:38) > at org.apache.lucene.store.IndexInput.readInt(IndexInput.java:70) at > org.apache.lucene.store.IndexInput.readLong(IndexInput.java:93) at > org.apache.lucene.index.FieldsReader.doc(FieldsReader.java:210) at > org.apache.lucene.index.SegmentReader.document(SegmentReader.java:948) at > org.apache.lucene.index.DirectoryReader.document(DirectoryReader.java:506) > at org.apache.lucene.index.IndexReader.document(IndexReader.java:947) > )
Hmm, that stack trace doesn't align w/ the boost factor. What was your request? I think there might be something else wrong here. > Do you know any other technique to reset to some fixed constant value, all > the query-result's scores? > Each query result should obtain the same score. > Any suggestion? The ConstantScoreQuery or a Filter should do this. You could do something like: &q=*:*&fq=<the real query>, as in &q=*:*&fq=field:foo -Grant -------------------------- Grant Ingersoll http://lucenerevolution.org Apache Lucene/Solr Conference, Boston Oct 7-8
