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From Erik Hatcher <>
Subject Re: Tagging using SOLR
Date Fri, 07 Sep 2007 10:49:00 GMT

On Sep 7, 2007, at 3:09 AM, Doss wrote:
> Thanks for the guidelines, but basically our idea is to build a  
> system like
>, is it possible to take counts of similar  
> words from
> a solr indexed field?

How do you define similar words?

Here's a tag cloud for a single user in Collex, a system I built:


Collex is using SOLR-139 now for tagging/annotating.

You will need to think through handling updates to your documents,  
and whether you will have user-specific tags too.  Reading up on the  
links I sent you and doing some experimenting is highly recommended.   
It's a non-trivial  scenario with Solr at this time.

By the way, a competitor, Simpy, is built on Lucene - so  
it is quite possible to build a heavy duty tagging system, but the  
devil is in the details.


> Thanks,
> Mohandoss
> On 9/6/07, Erik Hatcher <> wrote:
>> On Sep 6, 2007, at 3:29 AM, Doss wrote:
>>> We are running an appalication built using SOLR, now we are trying
>>> to build
>>> a tagging system using the existing SOLR indexed field called
>>> "tag_keywords", this field has different keywords seperated by
>>> comma, please
>>> give suggestions on how can we build tagging system using this  
>>> field?
>> There is also a wiki page on some brainstorming on how to implement
>> tagging within Solr: <>
>> It's easy enough to have a tag_keywords field, but updating a single
>> tag_keywords field is not so straightforward without sending the
>> entire document to Solr every time it is tagged.  See SOLR-139's
>> extensive comments and patches to see what you're getting into.
>>        Erik

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