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https://issues.apache.org/jira/browse/SOLR-2548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13794018#comment-13794018
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alexey commented on SOLR-2548:
------------------------------

We observed 4x speedup when calculating 14 facets in 6 threads for 200mln 
index. Thanks everybody!
https://twitter.com/AlexKozhemiakin/status/389688204309196800

> Multithreaded faceting
> ----------------------
>
>                 Key: SOLR-2548
>                 URL: https://issues.apache.org/jira/browse/SOLR-2548
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>    Affects Versions: 3.1
>            Reporter: Janne Majaranta
>            Assignee: Erick Erickson
>            Priority: Minor
>              Labels: facet
>             Fix For: 4.5, 5.0
>
>         Attachments: SOLR-2548_4.2.1.patch, SOLR-2548_for_31x.patch, 
> SOLR-2548_multithreaded_faceting,_dsmiley.patch, 
> SOLR-2548_multithreaded_faceting,_dsmiley.patch, SOLR-2548.patch, 
> SOLR-2548.patch, SOLR-2548.patch, SOLR-2548.patch, SOLR-2548.patch, 
> SOLR-2548.patch
>
>
> Add multithreading support for faceting.



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