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From "Chris Male (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1732) Multi-threaded Spatial Search
Date Fri, 03 Jul 2009 13:24:47 GMT
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


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As part of this work, the DistanceQueryBuilder has been replaced by the SpatialFilter, a Lucene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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