Solr Custom Similarity

similarity, solr

Solution

I figured it out on my own. I have stored my own implementation of DefaultSimilarity under /dist/ folder in solr. Then i add `<lib dir="../../../dist/org/apache/lucene/search/similarities/" regex=".*\.jar"/>` to my solrconfig.xml and everything works fine.

package org.apache.lucene.search.similarities;
import org.apache.lucene.index.FieldInvertState;
import org.apache.lucene.search.similarities.DefaultSimilarity;

public class MyNewSimilarityClass extends DefaultSimilarity {

@Override
public float coord(int overlap, int maxOverlap) {
    return 1.0f;
}

@Override
public float idf(long docFreq, long numDocs) {
    return 1.0f;
}

@Override
public float lengthNorm(FieldInvertState arg0) {
    return 1.0f;
}

@Override
public float tf(float freq) {
    return 1.0f;
}

}

Gist: https://gist.github.com/FabianKoestring/7846845

Problem

i want to set my own custom similarity in my solr schema.xml but i have a few problems with understanding this feature. I want to completely deactivate solr scoring (tf,idf,coord and fieldNorm). I dont know where to start. Things i know - I have to write my own DefaultSimilarity implementation. - Override the (tf,idf,coord and fieldNorm) - methods. - Load the class in schem.xml Where to store the class ? Are there any working examples in the web ? I cant find one! THANKS

Original source