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https://issues.apache.org/jira/browse/LUCENE-7588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15794838#comment-15794838
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ASF subversion and git services commented on LUCENE-7588:
---------------------------------------------------------

Commit b4a002f7d88a2383852e2bfd95b39bf7f6e33f2f in lucene-solr's branch 
refs/heads/master from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=b4a002f ]

LUCENE-7588: DrillSideways can now run its queries concurrently


> A parallel DrillSideways implementation
> ---------------------------------------
>
>                 Key: LUCENE-7588
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7588
>             Project: Lucene - Core
>          Issue Type: Improvement
>    Affects Versions: master (7.0), 6.3.1
>            Reporter: Emmanuel Keller
>            Priority: Minor
>              Labels: facet, faceting
>             Fix For: master (7.0), 6.3.1
>
>         Attachments: LUCENE-7588.patch
>
>
> Currently DrillSideways implementation is based on the single threaded 
> IndexSearcher.search(Query query, Collector results).
> On large document set, the single threaded collection can be really slow.
> The ParallelDrillSideways implementation could:
> 1. Use the CollectionManager based method IndexSearcher.search(Query query, 
> CollectorManager collectorManager)  to get the benefits of multithreading on 
> index segments,
> 2. Compute each DrillSideway subquery on a single thread.



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