Can you explain more what you are using TF for? Because it sounds rather like scoring. You could disable field norms and IDF and scoring would be mostly TF, no?
Upayavira On Sat, Oct 24, 2015, at 07:28 PM, Aki Balogh wrote: > Thanks, let me think about that. > > We're using termfreq to get the TF score, but we don't know which term > we'll need the TF for. So we'd have to do a corpuswide summing of > termfreq > for each potential term across all documents in the corpus. It seems like > it'd require some development work to compute that, and our code would be > fragile. > > Let me think about that more. > > It might make sense to just move to solrcloud, it's the right > architectural > decision anyway. > > > On Sat, Oct 24, 2015 at 1:54 PM, Upayavira <u...@odoko.co.uk> wrote: > > > If you just want word length, then do work during indexing - index a > > field for the word length. Then, I believe you can do faceting - e.g. > > with the json faceting API I believe you can do a sum() calculation on a > > field rather than the more traditional count. > > > > Thinking aloud, there might be an easier way - index a field that is the > > same for all documents, and facet on it. Instead of counting the number > > of documents, calculate the sum() of your word count field. > > > > I *think* that should work. > > > > Upayavira > > > > On Sat, Oct 24, 2015, at 04:24 PM, Aki Balogh wrote: > > > Hi Jack, > > > > > > I'm just using solr to get word count across a large number of documents. > > > > > > It's somewhat non-standard, because we're ignoring relevance, but it > > > seems > > > to work well for this use case otherwise. > > > > > > My understanding then is: > > > 1) since termfreq is pre-processed and fetched, there's no good way to > > > speed it up (except by caching earlier calculations) > > > > > > 2) there's no way to have solr sum up all of the termfreqs across all > > > documents in a search and just return one number for total termfreqs > > > > > > > > > Are these correct? > > > > > > Thanks, > > > Aki > > > > > > > > > On Sat, Oct 24, 2015 at 11:20 AM, Jack Krupansky > > > <jack.krupan...@gmail.com> > > > wrote: > > > > > > > That's what a normal query does - Lucene takes all the terms used in > > the > > > > query and sums them up for each document in the response, producing a > > > > single number, the score, for each document. That's the way Solr is > > > > designed to be used. You still haven't elaborated why you are trying > > to use > > > > Solr in a way other than it was intended. > > > > > > > > -- Jack Krupansky > > > > > > > > On Sat, Oct 24, 2015 at 11:13 AM, Aki Balogh <a...@marketmuse.com> > > wrote: > > > > > > > > > Gotcha - that's disheartening. > > > > > > > > > > One idea: when I run termfreq, I get all of the termfreqs for each > > > > document > > > > > one-by-one. > > > > > > > > > > Is there a way to have solr sum it up before creating the request, > > so I > > > > > only receive one number in the response? > > > > > > > > > > > > > > > On Sat, Oct 24, 2015 at 11:05 AM, Upayavira <u...@odoko.co.uk> wrote: > > > > > > > > > > > If you mean using the term frequency function query, then I'm not > > sure > > > > > > there's a huge amount you can do to improve performance. > > > > > > > > > > > > The term frequency is a number that is used often, so it is stored > > in > > > > > > the index pre-calculated. Perhaps, if your data is not changing, > > > > > > optimising your index would reduce it to one segment, and thus > > might > > > > > > ever so slightly speed the aggregation of term frequencies, but I > > doubt > > > > > > it'd make enough difference to make it worth doing. > > > > > > > > > > > > Upayavira > > > > > > > > > > > > On Sat, Oct 24, 2015, at 03:37 PM, Aki Balogh wrote: > > > > > > > Thanks, Jack. I did some more research and found similar results. > > > > > > > > > > > > > > In our application, we are making multiple (think: 50) concurrent > > > > > > > requests > > > > > > > to calculate term frequency on a set of documents in > > "real-time". The > > > > > > > faster that results return, the better. > > > > > > > > > > > > > > Most of these requests are unique, so cache only helps slightly. > > > > > > > > > > > > > > This analysis is happening on a single solr instance. > > > > > > > > > > > > > > Other than moving to solr cloud and splitting out the processing > > onto > > > > > > > multiple servers, do you have any suggestions for what might > > speed up > > > > > > > termfreq at query time? > > > > > > > > > > > > > > Thanks, > > > > > > > Aki > > > > > > > > > > > > > > > > > > > > > On Fri, Oct 23, 2015 at 7:21 PM, Jack Krupansky > > > > > > > <jack.krupan...@gmail.com> > > > > > > > wrote: > > > > > > > > > > > > > > > Term frequency applies only to the indexed terms of a tokenized > > > > > field. > > > > > > > > DocValues is really just a copy of the original source text > > and is > > > > > not > > > > > > > > tokenized into terms. > > > > > > > > > > > > > > > > Maybe you could explain how exactly you are using term > > frequency in > > > > > > > > function queries. More importantly, what is so "heavy" about > > your > > > > > > usage? > > > > > > > > Generally, moderate use of a feature is much more advisable to > > > > heavy > > > > > > usage, > > > > > > > > unless you don't care about performance. > > > > > > > > > > > > > > > > -- Jack Krupansky > > > > > > > > > > > > > > > > On Fri, Oct 23, 2015 at 8:19 AM, Aki Balogh < > > a...@marketmuse.com> > > > > > > wrote: > > > > > > > > > > > > > > > > > Hello, > > > > > > > > > > > > > > > > > > In our solr application, we use a Function Query (termfreq) > > very > > > > > > heavily. > > > > > > > > > > > > > > > > > > Index time and disk space are not important, but we're > > looking to > > > > > > improve > > > > > > > > > performance on termfreq at query time. > > > > > > > > > I've been reading up on docValues. Would this be a way to > > improve > > > > > > > > > performance? > > > > > > > > > > > > > > > > > > I had read that Lucene uses Field Cache for Function > > Queries, so > > > > > > > > > performance may not be affected. > > > > > > > > > > > > > > > > > > > > > > > > > > > And, any general suggestions for improving query performance > > on > > > > > > Function > > > > > > > > > Queries? > > > > > > > > > > > > > > > > > > Thanks, > > > > > > > > > Aki > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
