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From Joel Bernstein <joels...@gmail.com>
Subject Re: Faceting and Grouping Performance Degradation in Solr 5
Date Wed, 18 May 2016 16:39:17 GMT
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 <solrcal@gmail.com> wrote:

> Does anyone know the answer to this?
>
> On Wed, May 4, 2016 at 2:19 PM, Solr User <solrcal@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!
> >
> >
> >
>

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