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https://issues.apache.org/jira/browse/SOLR-2548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13758271#comment-13758271
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Yonik Seeley commented on SOLR-2548:
------------------------------------

bq. It appears to be useless complexity, perhaps a remnant from the original 
patch against 3.1. I took them out.

Actually, I see now (and it's absolutely needed ;-)
The base docset can change from one facet request to another (think excludes), 
hence if we go multi-threaded, we can't reference "SimpleFacets.docs" in 
anything that could be executed from a separate thread. 
                
> 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
>         Attachments: SOLR-2548_4.2.1.patch, SOLR-2548_for_31x.patch, 
> SOLR-2548.patch, SOLR-2548.patch, SOLR-2548.patch
>
>
> Add multithreading support for faceting.

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