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https://issues.apache.org/jira/browse/SOLR-4478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13711053#comment-13711053
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Alan Woodward commented on SOLR-4478:
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SolrConfig should be immutable, so I think that's safe to share. The thing
that worries me slightly here is the interaction between shared configsets and
mutable schemas. If two cores are sharing a config set with a managed schema,
and someone makes changes to the schema under one of them, does the other core
pick up the changes as well? Or does each core create it's own resourceloader,
schema, etc from the shared config?
I think we definitely want to combine this with the ZK loading code. There are
already a bunch of places that have 'if (zk) doThis else doThat' spaghetti in
them.
> 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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