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https://issues.apache.org/jira/browse/LUCENE-1732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838544#action_12838544
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David Smiley commented on LUCENE-1732:
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If I have a machine with say four CPU cores also running Solr with four cores
(a distributed -- i.e. sharded index), would it be fair to say that the
optimization presented in this issue is of no use?
> Multi-threaded Spatial Search
> -----------------------------
>
> Key: LUCENE-1732
> URL: https://issues.apache.org/jira/browse/LUCENE-1732
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/spatial
> Affects Versions: 2.9
> Reporter: Chris Male
> Attachments: LUCENE-1732_multi_threaded_spatial_search.patch
>
>
> The attached patch is a large refactoring of the spatial search contrib. The
> primary contribution is the creation of the ThreadedDistanceFilter, which
> uses an ExecutorService to filter the documents in multiple threads. As a
> result of doing the filtering in multiple threads, the time taken to filter
> 1.2 million documents has been reduced from nearly 3s, to between 500-800ms.
> As part of this work, the DistanceQueryBuilder has been replaced by the
> SpatialFilter, a Lucene Filter, some unused functionality has been removed,
> and the package hierarchy has changed. Consequently this patch breaks
> backwards compatibility with the existing spatial search contrib.
> Also during the process of making these changes, abstractions have been added
> so that the one implementation of the ThreadedDistanceFilter can work with
> lat/long and geohash data formats, and so that precise but costly arc
> distance calculations can be replaced by less precise but much more efficient
> flat plane calculations if needed.
> This patch will be used in an upcoming patch for Solr which will improve
> Solr's support for spatial search.
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