How many unique values in your group field? For high-cardinality fields there's quite a bit of bookkeeping that needs to be done.
Have you tried profiling to see where the CPU time is being spent? Best, Erick On Tue, May 23, 2017 at 7:46 AM, Nguyen Manh Tien <tien.nguyenm...@gmail.com> wrote: > Hi All, > > I recently switch from solr field collapse/expand to grouping for collapse > search result > All seem good but CPU is always high (80-100%) when i set param > group.ngroups=true. > > We set ngroups=true to get number of groups so that we can paginate search > result correctly. > Due to CPU issue we need to turn it off. > > Is ngroups=true is expensive feature? Is there any way to prevent CPU issue > and still have correct pagination. > > Thanks, > Tien
