Thanks, David.
I am thinking of a scenario that billions of objects, whose indices are too
big for a single machine to serve the indexing, to serve the querying. Is
there any sharding mechanism?
Can you give a comparison between solr-based geospatial search and PostGIS
based geospatial search?
* scalability
* functionality richness
* incremental indexing (re-indexing) cost
* query cost
* sharding scheme support
On Wed, Apr 6, 2011 at 9:42 PM, David Smiley (@MITRE.org) <dsmi...@mitre.org
> wrote:
> Sean,
> Geospatial search in Lucene/Solr is of course implemented based on
> Lucene's underlying index technology. That technology was originally just
> for text but it's been adapted very successfully for numerics and querying
> ranges too. The only mature geospatial field type in Solr 3.1 is LatLonType
> which under the hood is simply a pair of latitude & longitude numeric
> fields. There really isn't anything sophisticated (geospatially speaking)
> in Solr 3.1. I'm not sure what sort of geospatial DB research you have in
> mind but I would expect other systems would be free to use an indexing
> strategy designed for spatial such as "R-Trees". Nevertheless, I think
> Lucene offers the underlying primitives to compete with systems using other
> technologies. Case in point is my patch SOLR-2155 which indexes a single
> point in the form of a "geohash" at multiple resolutions (geohash lengths
> AKA spatial prefixes / grids) and uses a recursive algorithm to efficiently
> query an arbitrary shape. It's quite fast and bests LatLonType already;
> and
> there's a lot more I can do to make it faster.
> This is definitely a field of interest and a growing one in the
> Lucene/Solr community. There are even some external spatial providers
> (JTeam, MetaCarta) and I'm partnering with other individuals to create a
> new
> one. Expect to see more in the coming months. If you're looking for some
> specific geospatial capabilities then let us know.
>
> ~ David Smiley
> Author: http://www.packtpub.com/solr-1-4-enterprise-search-server/
>
> -----
> Author: https://www.packtpub.com/solr-1-4-enterprise-search-server/book
> --
> View this message in context:
> http://lucene.472066.n3.nabble.com/difference-between-geospatial-search-from-database-angle-and-from-solr-angle-tp2788442p2788972.html
> Sent from the Solr - User mailing list archive at Nabble.com.
>
--
--Sean
