I still need a relatively precise boost. No less precise than hourly. I think that would make for a pretty messy field query.
On Mon, Jun 7, 2010 at 2:15 AM, Lance Norskog <goks...@gmail.com> wrote: > If you are unhappy with the performance overhead of a function boost, > you can push it into a field query by boosting date ranges. > > You would group in date ranges: documents in September would be > boosted 1.0, October 2.0, November 3.0 etc. > > > On 6/5/10, Asif Rahman <a...@newscred.com> wrote: > > Thanks everyone for your help so far. I'm still trying to get to the > bottom > > of whether switching over to index-time boosts will give me a performance > > improvement, and if so if it will be noticeable. This is all under the > > assumption that I can achieve the scoring functionality that I need with > > either index-time or search-time boosting (given the loss of precision. > I > > can always dust off the old profiler to see what's going on with the > > search-time boosts, but testing the index-time boosts will require a full > > reindex, which could take days with our dataset. > > > > On Sat, Jun 5, 2010 at 9:17 AM, Robert Muir <rcm...@gmail.com> wrote: > > > >> 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 > >> > > > > > > > > -- > > Asif Rahman > > Lead Engineer - NewsCred > > a...@newscred.com > > http://platform.newscred.com > > > > > -- > Lance Norskog > goks...@gmail.com > -- Asif Rahman Lead Engineer - NewsCred a...@newscred.com http://platform.newscred.com
