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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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Jamie Swain updated SOLR-7036:
------------------------------
    Attachment:     (was: jstack-output.txt)

> 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, 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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