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https://issues.apache.org/jira/browse/SOLR-4478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13711135#comment-13711135
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Steve Rowe commented on SOLR-4478:
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{quote}
bq. 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?
I think it should... It's one logical schema, just as if you changed it on disk
and reloaded/restarted the cores. One physical schema == one logical schema. It
also already effectively works this way in Cloud mode.
{quote}
+1
In my original commit for SOLR-3251, I had code to handle shared + mutable
schemas, but it wasn't all hooked up properly or tested, and with named config
sets in play, I haven't pursued it.
For local shared + mutable schema, I think we have two choices:
# Each named config set has a single shared in-memory representation, in
addition to a single shared persisted representation.
# Each core has its own private in-memory representation, updated when the
shared persisted representation is updated.
#2 nullifies the utility of shared schemas, so it's not really an option, IMHO.
> 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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