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https://issues.apache.org/jira/browse/SOLR-7036?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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md updated SOLR-7036:
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Attachment: performance.txt
SOLR-7036.patch
> 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,
> performance.txt
>
>
> 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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