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From Sean Bigdatafun <>
Subject Re: difference between geospatial search from database angle and from solr angle
Date Thu, 07 Apr 2011 06:24:40 GMT
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 ( <
> 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:
> -----
>  Author:
> --
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