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https://issues.apache.org/jira/browse/SOLR-2548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756089#comment-13756089
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Erick Erickson commented on SOLR-2548:
--------------------------------------

See Gun's comments about UnInvertedField serializing the facet counts due to 
the placement of the new viz. the synch block. It's at the very end of the 
class....

Do people think that the chance of uninverting the same field more than once 
and throwing away 2...N is frequent enough to guard against with a Future (or 
whatever?) It seems like this is an expensive enough operation that the 
complexity is reasonable.
                
> 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
>            Priority: Minor
>              Labels: facet
>         Attachments: SOLR-2548_4.2.1.patch, SOLR-2548_for_31x.patch, 
> SOLR-2548.patch
>
>
> Add multithreading support for faceting.

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