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https://issues.apache.org/jira/browse/SOLR-2548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13790544#comment-13790544
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David Smiley commented on SOLR-2548:
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Multithreaded faceting is useful when your CPU core count is much greater than
the number of Solr cores you have, and you have a ton of data and need to facet
on multiple fields. You could theoretically get similar results by sharding
more but you should limit sharding based on disk IO capabilities (especially
when there's so much it won't get in RAM), which isn't necessary one-for-one
with the CPU count.
> 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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