Dan Climan schrieb:
I wanted to test several strategies for Document Boosting. It seems like
the only way to do this was to reindex every Document and do setBoost. This
will take a long time. I had an idea for how to do this without reindexing
and I was curious if there was a better strategy or if there were additional
points I should consider in this approach
1) Optimize the index
2) Get the internal lucene doc id for each document
3) Update the boosts
IndexReader ir = IndexReader.open(indexDir);
IndexSearcher searcher = new IndexSearcher(ir) ;
Similarity sim = searcher.getSimilarity();
Collection indexedFields = ir.getFieldNames(true);
Iterator it = indexedFields.iterator();
while(it.hasNext()) {
String f = (String) it.next());
byte[] norms = ir.norms(f);
for (int i=0; i<numDocs; i++) {
float oldNorm = sim.decodeNorm(norms[i]);
float newNorm = oldNorm * ( newDocBoost[i] /
oldDocBoost[i]);
norms[i] = sim.encodeNorm(norms[i]);
}
}
4) Write new norms files
Does this become prohibitively complicated using a compound file system?
Comments?
Thanks,
Dan
IndexReader has a setNorm method. It should also work for indexes with
compound files. After (re)setting the norm, a separate norms-file is
generated which will be reintegrated into the compound file after the
next optimize or merge.
Christoph
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