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https://issues.apache.org/jira/browse/LUCENE-7588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15751716#comment-15751716
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Erick Erickson commented on LUCENE-7588:
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Well, for DrillSideways I'd ping [~mikemccand] for the quickest read if he has
the time.
Basically you gently prompt the JIRA from time to time and see if you can get
someone's attention.
Perhaps a short description of the approach the patch takes would help orient
someone who's looking at it.
> 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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