Yeah a copyField into one could be a good space/time tradeoff. It can be more manageable to use an all field for both relevancy and performance, if you can handle the duplication of data.
You could set tie=1.0, which effectively sums all the matches instead of picking the best match. You'll still have cases where one field's score might just happen to be far off of another, and thus dominating the summation. But something easy to try if you want to keep playing with dismax. -Doug On Wed, May 20, 2015 at 2:56 PM, Steven White <swhite4...@gmail.com> wrote: > Hi Doug, > > Your blog write up on relevancy is very interesting, I didn't know this. > Looks like I have to go back to my drawing board and figure out an > alternative solution: somehow get those group-based-fields data into a > single field using copyField. > > Thanks > > Steve > > On Wed, May 20, 2015 at 11:17 AM, Doug Turnbull < > dturnb...@opensourceconnections.com> wrote: > > > Steven, > > > > I'd be concerned about your relevance with that many qf fields. Dismax > > takes a "winner takes all" point of view to search. Field scores can vary > > by an order of magnitude (or even two) despite the attempts of query > > normalization. You can read more here > > > > > http://opensourceconnections.com/blog/2013/07/02/getting-dissed-by-dismax-why-your-incorrect-assumptions-about-dismax-are-hurting-search-relevancy/ > > > > I'm about to win the "blashphemer" merit badge, but ad-hoc all-field like > > searching over many fields is actually a good use case for > Elasticsearch's > > cross field queries. > > > > > https://www.elastic.co/guide/en/elasticsearch/guide/master/_cross_fields_queries.html > > > > > http://opensourceconnections.com/blog/2015/03/19/elasticsearch-cross-field-search-is-a-lie/ > > > > It wouldn't be hard (and actually a great feature for the project) to get > > the Lucene query associated with cross field search into Solr. You could > > easily write a plugin to integrate it into a query parser: > > > > > https://github.com/elastic/elasticsearch/blob/master/src/main/java/org/apache/lucene/queries/BlendedTermQuery.java > > > > Hope that helps > > -Doug > > -- > > *Doug Turnbull **| *Search Relevance Consultant | OpenSource Connections, > > LLC | 240.476.9983 | http://www.opensourceconnections.com > > Author: Relevant Search <http://manning.com/turnbull> from Manning > > Publications > > This e-mail and all contents, including attachments, is considered to be > > Company Confidential unless explicitly stated otherwise, regardless > > of whether attachments are marked as such. > > On Wed, May 20, 2015 at 8:27 AM, Steven White <swhite4...@gmail.com> > > wrote: > > > > > Hi everyone, > > > > > > My solution requires that users in group-A can only search against a > set > > of > > > fields-A and users in group-B can only search against a set of > fields-B, > > > etc. There can be several groups, as many as 100 even more. To meet > > this > > > need, I build my search by passing in the list of fields via "qf". > What > > > goes into "qf" can be large: as many as 1500 fields and each field name > > > averages 15 characters long, in effect the data passed via "qf" will be > > > over 20K characters. > > > > > > Given the above, beside the fact that a search for "apple" translating > > to a > > > 20K characters passing over the network, what else within Solr and > > Lucene I > > > should be worried about if any? Will I hit some kind of a limit? Will > > > each search now require more CPU cycles? Memory? Etc. > > > > > > If the network traffic becomes an issue, my alternative solution is to > > > create a /select handler for each group and in that handler list the > > fields > > > under "qf". > > > > > > I have considered creating pseudo-fields for each group and then use > > > copyField into that group. During search, I than can "qf" against that > > one > > > field. Unfortunately, this is not ideal for my solution because the > > fields > > > that go into each group dynamically change (at least once a month) and > > when > > > they do change, I have to re-index everything (this I have to avoid) to > > > sync that group-field. > > > > > > I'm using "qf" with edismax and my Solr version is 5.1. > > > > > > Thanks > > > > > > Steve > > > > > > -- *Doug Turnbull **| *Search Relevance Consultant | OpenSource Connections, LLC | 240.476.9983 | http://www.opensourceconnections.com Author: Relevant Search <http://manning.com/turnbull> from Manning Publications This e-mail and all contents, including attachments, is considered to be Company Confidential unless explicitly stated otherwise, regardless of whether attachments are marked as such.
