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https://issues.apache.org/jira/browse/SOLR-4478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13787282#comment-13787282
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Trey Grainger commented on SOLR-4478:
-------------------------------------

Hi Erick,

Yes, that resolves the hardest of the two problems.  The other issue is that 
since a dedicated folder is now required per-core (to hold the core.properties 
file), the core _CREATE_ command needs to now also be able to create the folder 
for the new core if it doesn't exist.  Something like:
http://localhost:8983/solr/admin/cores?action=CREATE&name=newCore&*coreDir=cores/newCore*&configset=sharedconfig

Alternatively, _instanceDir_ could continue to serve that function (instead of 
being deprecated):
http://localhost:8983/solr/admin/cores?action=CREATE&name=newCore&*instanceDir=cores/newCore*&configset=sharedconfig

I think the combination of adding configSet and adding the ability for the 
CREATE command to actually create the new folder to hold core.properties should 
handle the use case.

> Allow cores to specify a named config set in non-SolrCloud mode
> ---------------------------------------------------------------
>
>                 Key: SOLR-4478
>                 URL: https://issues.apache.org/jira/browse/SOLR-4478
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 4.2, 5.0
>            Reporter: Erick Erickson
>         Attachments: SOLR-4478.patch, SOLR-4478.patch
>
>
> Part of moving forward to "the new way", after SOLR-4196 etc... I propose an 
> additional parameter specified on the <core> node in solr.xml or as a 
> parameter in the "discovery" mode core.properties file, call it configSet, 
> where the value provided is a path to a directory, either absolute or 
> relative. Really, this is as though you copied the conf directory somewhere 
> to be used by more than one core.
> Straw-man: There will be a directory <solr_home>/configsets which will be the 
> default. If the configSet parameter is, say, "myconf", then I'd expect a 
> directory named "myconf" to exist in <solr_home>/configsets, which would look 
> something like
> <solr_home>/configsets/myconf/schema.xml
>                               solrconfig.xml
>                               stopwords.txt
>                               velocity
>                               velocity/query.vm
> etc.
> If multiple cores used the same configSet, schema, solrconfig etc. would all 
> be shared (i.e. shareSchema="true" would be assumed). I don't see a good 
> use-case for _not_ sharing schemas, so I don't propose to allow this to be 
> turned off. Hmmm, what if shareSchema is explicitly set to false in the 
> solr.xml or properties file? I'd guess it should be honored but maybe log a 
> warning?
> Mostly I'm putting this up for comments. I know that there are already 
> thoughts about how this all should work floating around, so before I start 
> any work on this I thought I'd at least get an idea of whether this is the 
> way people are thinking about going.
> Configset can be either a relative or absolute path, if relative it's assumed 
> to be relative to <solr_home>.
> Thoughts?



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