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https://issues.apache.org/jira/browse/SOLR-7570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14564527#comment-14564527
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Noble Paul commented on SOLR-7570:
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bq.Changes shared between collections should be done through a different API, I 
think. Something like the configset API being discussed on SOLR-5955 would be 
more appropriate for that.

Those changes will be rare and I would say let them upload full files using a 
config upload API

bq.Changes shared between collections should be done through a different API, I 
think

Can we make it a property of the configset called "shareable". We should use an 
extra empty node in the conf dir called SHAREABLE , which signifies that this 
configset is shareable and overlay extra can be written there . Which will 
ensure that the overlay etc will be written to the configset dir itself. 

> Config APIs should not modify the ConfigSet
> -------------------------------------------
>
>                 Key: SOLR-7570
>                 URL: https://issues.apache.org/jira/browse/SOLR-7570
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Tomás Fernández Löbbe
>         Attachments: SOLR-7570.patch
>
>
> Originally discussed here: 
> http://mail-archives.apache.org/mod_mbox/lucene-dev/201505.mbox/%3CCAMJgJxSXCHxDzJs5-C-pKFDEBQD6JbgxB=-xp7u143ekmgp...@mail.gmail.com%3E
> The ConfigSet used to create a collection should be read-only. Changes made 
> via any of the Config APIs should only be applied to the collection where the 
> operation is done and no to other collections that may be using the same 
> ConfigSet. As discussed in the dev list: 
> When a collection is created we should have two things, an immutable part 
> (the ConfigSet) and a mutable part (configoverlay, generated schema, etc). 
> The ConfigSet will still be placed in ZooKeeper under "/configs" but the 
> mutable part should be placed under "/collections/$COLLECTION_NAME/…"
> [~romseygeek] suggested: 
> {quote}
> A nice way of doing it would be to make it part of the SolrResourceLoader 
> interface.  The ZK resource loader could check in the collection-specific 
> zknode first, and then under configs/, and we could add a writeResource() 
> method that writes to the collection-specific node as well.  Then all config 
> I/O goes via the resource loader, and we have a way of keeping certain parts 
> immutable.
> {quote}



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