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 > > > > >
