Alejandro, you'll have to clarify how you are using the term "federated search". I mean, technically Ahmet is correct in that Solr queries can be fanned out to shards and the results from each shard aggregated ("federated") into a single result list, but... more traditionally, "federated" refers to "disparate" databases or search engines.

See:
http://en.wikipedia.org/wiki/Federated_search

So, please tell us a little more about what you are really trying to do.

I mean, is all of your data in Solr, in multiple collections, or on multiple Solr servers, or... is only some of your data in Solr and some is in other search engines?

Another approach taken with Solr is that indeed all of your source data may be in "disparate databases", but you perform an ETL (Extract, Transform, and Load) process to ingest all of that data into Solr and then simply directly search the data within Solr.

-- Jack Krupansky

-----Original Message----- From: Ahmet Arslan
Sent: Wednesday, October 1, 2014 9:35 AM
To: solr-user@lucene.apache.org
Subject: Re: Solr + Federated Search Question

Hi,

Federation is possible. Solr has distributed search support with shards parameter.

Ahmet



On Wednesday, October 1, 2014 4:29 PM, Alejandro Calbazana <acalbaz...@gmail.com> wrote:
Hello,

I have a general question about Solr in a federated search context.  I
understand that Solr does not do federated search and that  different tools
are often used to incorporate Solr indexes into a federated/enterprise
search solution.  Does anyone have recommendations on any products (open
source or otherwise) that addresses this space?

Thanks,

Alejandro

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