Hi Micheal, On what field type are you grouping and what version of Solr are you using? Grouping by string field is faster.
Martijn On 9 December 2011 12:46, Michael Jakl <jakl.mich...@gmail.com> wrote: > Hi, I'm using the grouping feature of Solr to return a list of unique > documents together with a count of the duplicates. > > Essentially I use Solr's signature algorithm to create the "signature" > field and use grouping on it. > > To provide good numbers for paging through my result list, I'd like to > compute the total number of documents found (= matches) and the number > of unique documents (= ngroups). Unfortunately, enabling > "group.ngroups" considerably slows down the query (from 500ms to > 23000ms for a result list of roughly 300000 documents). > > Is there a faster way to compute the number of groups (or unique > values in the signature field) in the search result? My Solr instance > currently contains about 50 million documents and around 10% of them > are duplicates. > > Thank you, > Michael -- Met vriendelijke groet, Martijn van Groningen
