Have you enabled docValues (and reindexed from scratch) on the field you're grouping on?
Best, Erick On Wed, Nov 22, 2017 at 5:13 AM, Kempelen, Ákos <akos.kempe...@wolterskluwer.com> wrote: > Hello, > > I am migrating our codebase from Solr 4.7 to 7.0.1 but the performance of > result grouping seems very poor using the newer Solr. > For example a simple MatchAllDocsQuery takes 5 sec on Solr4.7, and 21 sec on > Solr7. > I wonder what causes the x4 difference in time? We hoped that newer Solr > versions will provide better performances... > Using Field collapsing could would be a solution, but it produces different > facet counts. > Thanks, > Akos > >
