Hi Shamik, We use DocValues for grouping, and although I have nothing to compare it to (we started with DocValues), we are also seeing similar poor results as you: easily 60% overhead compared to non-group queries. Looking around for some solution, no quick fix is presenting itself unfortunately. CollapsingQParserPlugin also is too limited for our needs.
-----Original Message----- From: Shamik Bandopadhyay [mailto:sham...@gmail.com] Sent: Thursday, January 15, 2015 6:02 PM To: solr-user@lucene.apache.org Subject: Does DocValues improve Grouping performance ? Hi, Does use of DocValues provide any performance improvement for Grouping ? I' looked into the blog which mentions improving Grouping performance through DocValues. https://lucidworks.com/blog/fun-with-docvalues-in-solr-4-2/ Right now, Group by queries (which I can't sadly avoid) has become a huge bottleneck. It has an overhead of 60-70% compared to the same query san group by. Unfortunately, I'm not able to be CollapsingQParserPlugin as it doesn't have a support similar to "group.facet" feature. My understanding on DocValues is that it's intended for faceting and sorting. Just wondering if anyone have tried DocValues for Grouping and saw any improvements ? -Thanks, Shamik
