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https://issues.apache.org/jira/browse/SOLR-4478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13711098#comment-13711098
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Alan Woodward commented on SOLR-4478:
-------------------------------------

OK, how about this for an idea?  Configsets are always shared, and so changes 
in one schema are reflected in all of them.  But we add an option at core 
creation time to use the configset as a template, rather than sharing it, which 
copies the configset contents into the new core's config directory (whether on 
the filesystem or in Zk).  Maybe add a command that will do this after core 
creation as well.  So you can share all your config, but if you later decide 
that one core needs to diverge, then you split it off with it's own setup.
                
> Allow cores to specify a named config set
> -----------------------------------------
>
>                 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
>            Assignee: 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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