Multi-threaded Spatial Search
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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
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As part of this work, the DistanceQueryBuilder has been replaced by the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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