[Tagdb] Tags and data storage

[Nitin Borwankar]

OK, so this is clearly quite powerful.
Erik, Otis, thanks very much for the mini tutorial.

Nitin


Erik Hatcher wrote:

>
> On Mar 22, 2006, at 7:29 PM, Nitin Borwankar wrote:
>
>> a) How does a Lucene based  app  perform at the lower  ends  of the  
>> scale - is there an overhead and a  threshold above which Lucene makes
>> sense ?
>
>
> Lucene works well at all scales, actually.  Certainly at the higher  
> ends of scalability more sophisticated management needs to be  
> considered such as distributed index servers, etc.
>
> I think even at lower scales, Lucene makes great sense because of its  
> querying capability.  I'm no SQL expert, but formulating a query such  
> as "show me all objects tagged with _foo_, _bar_, but not _baz_....  
> OR _baz_ and not _bar_" is likely to be tricky, but with an inverted  
> index such as Lucene it is trivial.  Maybe that particular query is  
> actually not too bad in SQL, but I'm also combining tag queries with  
> full-text searches such as "this phrase" in the body of a document  
> that has been tagged, along with other filters (for date, genre, etc).
>
>> b) How do I hook up my web app to a Lucene-tag-backend when my web  
>> app is not written in Java ?
>> c) Are there commonly used JSON/XML-RPC etc. wrappers around the  
>> backend so I can call it from Python/PHP/Ruby ?
>
>
> Lucene by itself is just a JAR file, and by itself there is no  
> "server" as such.  However, many projects have built web services  
> around Lucene.  The most interesting of these is the newly donated  
> Solr project:
>
>     http://incubator.apache.org/solr/
>
> I'm starting to prototype with it to replace my current tag system  
> for my University research project (tagging and annotating library  
> archives).  My current system is partly in Kowari, and partly my own  
> custom Lucene search server which is a very rudimentary version of  
> the more sophisticated faceted capabilities that Solr provides.  My  
> front-end is in Ruby on Rails, using SOAP and XML-RPC respectively.   
> Solr uses HTTP GET/POST, and it is driving CNETs faceted search  
> system, where it is deployed in a distributed fashion.
>
>     Erik
>
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