Joel, Thank you for taking the time to respond to my question. I tried the JSON Facet API for one query that uses facet.method=enum (since this one has a ton of unique values and performed better with enum) but this was way slower than even the slower Solr 5 times. I did not try the new API with the non-enum queries though so I will give that a go. It looks like Solr 5.5.1 also has a facet.method=uif which will be interesting to try.
If these do not prove helpful, it looks like I will need to wait for SOLR-8096 to be resolved before upgrading. Thanks also for your comment on top_fc for the CollapsingQParser. I use collapse/expand for some queries but traditional grouping for others due to performance. It will be interesting to see if those grouping queries perform better now using CollapsingQParser with top_fc. On Wed, May 18, 2016 at 11:39 AM, Joel Bernstein <joels...@gmail.com> wrote: > Yes, SOLR-8096 is the issue here. > > I don't believe indexing with docValues is going to help too much with > this. The enum slowness may not be related, but I'm not positive about > that. > > The major slowdowns are likely due to the removal of the top level > FieldCache from general use and the removal of the FieldValuesCache which > was used for multi-value field faceting. > > The JSON facet API covers all the functionality in the traditional > faceting, and it has been developed to be very performant. > > You may also want to see if Collapse/Expand can meet your applications > needs rather Grouping. It allows you to specify using a top level > FieldCache if performance is a blocker without it. > > > > > Joel Bernstein > http://joelsolr.blogspot.com/ > > On Wed, May 18, 2016 at 10:42 AM, Solr User <solr...@gmail.com> wrote: > > > Does anyone know the answer to this? > > > > On Wed, May 4, 2016 at 2:19 PM, Solr User <solr...@gmail.com> wrote: > > > > > I recently was attempting to upgrade from Solr 4.8.1 to Solr 5.4.1 but > > had > > > to abort due to average response times degraded from a baseline volume > > > performance test. The affected queries involved faceting (both enum > > method > > > and default) and grouping. There is a critical bug > > > https://issues.apache.org/jira/browse/SOLR-8096 currently open which I > > > gather is the cause of the slower response times. One concern I have > is > > > that discussions around the issue offer the suggestion of indexing with > > > docValues which alleviated the problem in at least that one reported > > case. > > > However, indexing with docValues did not improve the performance in my > > case. > > > > > > Can someone please confirm or correct my understanding that this issue > > has > > > no path forward at this time and specifically that it is already known > > that > > > docValues does not necessarily solve this? > > > > > > Thanks in advance! > > > > > > > > > > > >
