The ngroup option collects per search the number of unique groups matching the query. Based on the collected groups it returns the count. So it depends of the number of groups matching the query. To get more in detail: per unique group a ByteRef instance is created to represent a group and this put into a ArrayList. I think you can use this to roughly calculate the memory used per request.
Besides this the ngroup relies in most cases on the FieldCache which is also takes a decent amount of memory. But just like sorting this is cache is shared between requests. Martijn On 11 November 2011 22:34, Rafał Kuć <r....@solr.pl> wrote: > Hello! > > I was wondering if there is a way for calculating the memory > consumption of group.ngroups parameter. I know the the answer can be > 'that depends', but what I'm actually wondering about is what the > memory consumption depends on - number of documents returned by a > query or number of groups ? Or maybe by it depends on another factor ? > > > > -- > Regards, > Rafał Kuć > > -- Met vriendelijke groet, Martijn van Groningen
