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https://issues.apache.org/jira/browse/SOLR-2548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762321#comment-13762321
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Robert Muir commented on SOLR-2548:
-----------------------------------
Its a bad idea to call Future.cancel here.
If any of the faceting methods are blocked on IO (e.g. docvalues faceting),
this will close file descriptors with NIO/MMAP directory implementations: see
the documentation in org.apache.lucene.store for more information.
> 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.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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