Wow, an XPA user! The distributed search merging and global IDF calculation that we used in Ultraseek XPA is described here:
http://wunderwood.org/most_casual_observer/2007/04/progressive_reranking.html If you have per-term document frequencies and numdocs for each shard, you can calculate global IDF. It is always possible, though maybe slow, to get per-term document frequencies, because you can do a search for just that term and use the count of matches. The Ultraseek quality was additive, like bf. A multiplicative boost (like edismax) is much more stable over a range of boost values. wunder Former Ultraseek Architect Search Guy, Chegg.com On Nov 28, 2012, at 9:43 AM, Sandeep Mestry wrote: > Dear All, Can anyone suggest how long it will take to get SOLR-1632 patch > into Solr 4? > > Also, it'd be good if someone has used any alternate method like Ultraseek > XPA Java library to calculate the distributed ranking? > > Many Thanks, > Sandeep > > > On 22 October 2012 13:23, Sascha SZOTT <sz...@gmx.de> wrote: > >> Hi Mark, >> >> >> Mark Miller wrote: >> >>> Still waiting on that issue. I think Andrzej should just update it to >>> trunk and commit - it's option and defaults to off. Go vote :) >>> >> Sounds like the problem is already solved and the remaining work consists >> of code integration? Can somebody estimate how much work that would be? >> >> -Sascha >> -- Walter Underwood wun...@wunderwood.org
