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From Joe Calderon <>
Subject Re: federated / meta search
Date Thu, 17 Jun 2010 22:35:01 GMT
yes, you can use distributed search across shards with different
schemas as long as the query only references overlapping fields, i
usually test adding new fields or tokenizers on one shard and deploy
only after i verified its working properly

On Thu, Jun 17, 2010 at 1:10 PM, Markus Jelsma <> wrote:
> Hi,
> Check out Solr sharding [1] capabilities. I never tested it with different schema's but
if each node is queried with fields that it supports, it should return useful results.
> [1]:
> Cheers.
> -----Original message-----
> From: Sascha Szott <>
> Sent: Thu 17-06-2010 19:44
> To:;
> Subject: federated / meta search
> Hi folks,
> if I'm seeing it right Solr currently does not provide any support for
> federated / meta searching. Therefore, I'd like to know if anyone has
> already put efforts into this direction? Moreover, is federated / meta
> search considered a scenario Solr should be able to deal with at all or
> is it (far) beyond the scope of Solr?
> To be more precise, I'll give you a short explanation of my
> requirements. Assume, there are a couple of Solr instances running at
> different places. The documents stored within those instances are all
> from the same domain (bibliographic records), but it can not be ensured
> that the schema definitions conform to 100%. But lets say, there are at
> least some index fields that are present in all instances (fields with
> the same name and type definition). Now, I'd like to perform a search on
> all instances at the same time (with the restriction that the query
> contains only those fields that overlap among the different schemas) and
> combine the results in a reasonable way by utilizing the score
> information associated with each hit. Please note, that due to legal
> issues it is not feasible to build a single index that integrates the
> documents of all Solr instances under consideration.
> Thanks in advance,
> Sascha

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