On Fri, Jun 4, 2010 at 7:50 PM, Asif Rahman <a...@newscred.com> wrote:
> Perhaps I should have been more specific in my initial post. I'm doing > date-based boosting on the documents in my index, so as to assign a higher > score to more recent documents. Currently I'm using a boost function to > achieve this. I'm wondering if there would be a performance improvement if > instead of using the boost function at search time, I indexed the documents > with a date-based boost. > > Asif, without knowing more details, before you look at performance you might want to consider the relevance impacts of switching to index-time boosting for your use case too. You can read more about the differences here: http://lucene.apache.org/java/3_0_1/scoring.html But I think the most important for this date-influenced use case is: "Indexing time boosts are preprocessed for storage efficiency and written to the directory (when writing the document) in a single byte (!)" If you do this as an index-time boost, your boosts will lose lots of precision for this reason. -- Robert Muir rcm...@gmail.com
