Question

I am using solrj for a distributed search. Based on certain user preferences, I will have to search through a particular set of indexes. Is there any way through which I can programatically(duh!) specify the datadir for that particular search query?

I did snoop through the documentation, but couldn’t find anyway other than having the datasets in different cores, is there a better way?

Edit 1 : All the set of indexes have the same schema format.

Answer 1

You can change the dataDir almost dynamically using the CREATE CoreAdmin action, and specifying a dataDir parameter.

Creates a new core based on preexisting
instanceDir/solrconfig.xml/schema.xml, and registers it. If
persistence is enabled (persist=true), the configuration for this new
core will be saved in ‘solr.xml’. If a core with the same name exists,
while the “new” created core is initalizing, the “old” one will
continue to accept requests. Once it has finished, all new request
will go to the “new” core, and the “old” core will be unloaded.

Anyway you’ll need to load a new core, it isn’t possible changing the data directory without doing it.

You can use solrj to invoke CoreAdmin action using the CoreAdminRequest and CoreAdminResponse classes.