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From Markus Jelsma <>
Subject RE: federated / meta search
Date Thu, 17 Jun 2010 20:10:50 GMT


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.




-----Original message-----
From: Sascha Szott <>
Sent: Thu 17-06-2010 19:44
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,

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