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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1732) Multi-threaded Spatial Search
Date Thu, 25 Feb 2010 21:28:27 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838544#action_12838544
] 

David Smiley commented on LUCENE-1732:
--------------------------------------

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 As part of this work, the DistanceQueryBuilder has been replaced by the SpatialFilter,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