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https://issues.apache.org/jira/browse/LUCENE-7588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15809228#comment-15809228
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ASF subversion and git services commented on LUCENE-7588:
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Commit 1aa9c4251289e71ab8e87b03797b20f4a8fda0a5 in lucene-solr's branch
refs/heads/master from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=1aa9c42 ]
LUCENE-7588: the parallell search method was failing to pass on the user's
requested sort when merge-sorting all hits
> 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), 6.4
>
> Attachments: LUCENE-7588.patch, lucene-7588-sort-fix.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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