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https://issues.apache.org/jira/browse/SOLR-7036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15691507#comment-15691507
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Erick Erickson commented on SOLR-7036:
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I'm thoroughly confused about the state of these two JIRAs, this one and
SOLR-4763.
1> Do JSON facets supersede this? Should we just be moving to JSON facets? If
yes, has the refinement step been added to JSON facets? Or is it even
necessary/relevant?
2> does enabling DocValues sidestep this problem? We're recommending docValues
for grouping and faceting after all. On some tests I did having DocValues for
these fields sped made the timings roughly equal, but that may just mean I'm
not testing correctly.
3> Last time I was in here on 23-Oct, there were some problems with the patch.
Any progress on that front? I just ran the test that was failing so it looks
like maybe the changes for SOLR-9654 [~yo...@apache.org] might have addressed
point <1>. Not sure there's really anything to be done for <2>.
> Faster method for group.facet
> -----------------------------
>
> Key: SOLR-7036
> URL: https://issues.apache.org/jira/browse/SOLR-7036
> Project: Solr
> Issue Type: Improvement
> Components: faceting
> Affects Versions: 4.10.3
> Reporter: Jim Musil
> Assignee: Erick Erickson
> Fix For: 5.5, 6.0
>
> Attachments: SOLR-7036.patch, SOLR-7036.patch, SOLR-7036.patch,
> SOLR-7036.patch, SOLR-7036.patch, SOLR-7036.patch, SOLR-7036_zipped.zip,
> jstack-output.txt, performance.txt, source_for_patch.zip
>
>
> This is a patch that speeds up the performance of requests made with
> group.facet=true. The original code that collects and counts unique facet
> values for each group does not use the same improved field cache methods that
> have been added for normal faceting in recent versions.
> Specifically, this approach leverages the UninvertedField class which
> provides a much faster way to look up docs that contain a term. I've also
> added a simple grouping map so that when a term is found for a doc, it can
> quickly look up the group to which it belongs.
> Group faceting was very slow for our data set and when the number of docs or
> terms was high, the latency spiked to multiple second requests. This solution
> provides better overall performance -- from an average of 54ms to 32ms. It
> also dropped our slowest performing queries way down -- from 6012ms to 991ms.
> I also added a few tests.
> I added an additional parameter so that you can choose to use this method or
> the original. Add group.facet.method=fc to use the improved method or
> group.facet.method=original which is the default if not specified.
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