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https://issues.apache.org/jira/browse/SOLR-7570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14568523#comment-14568523
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Noble Paul commented on SOLR-7570:
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bq.I think that's making things overcomplicated.
I agree with you . But we have to find a sane way to share mutable configs and
it is an extremely common usecase
Here is another suggestion
Every collection , by default, stores the mutable stuff at
{{/collections/$COLLECTION_NAME/conf}} . Alternately, it should be possible to
specify the ZNODE where you would store the mutable stuff during collection
creation. This enables the user to specify a common ZNODE for multiple
collections
> Config APIs should not modify the ConfigSet
> -------------------------------------------
>
> Key: SOLR-7570
> URL: https://issues.apache.org/jira/browse/SOLR-7570
> Project: Solr
> Issue Type: Improvement
> Reporter: Tomás Fernández Löbbe
> Attachments: SOLR-7570.patch
>
>
> Originally discussed here:
> http://mail-archives.apache.org/mod_mbox/lucene-dev/201505.mbox/%3CCAMJgJxSXCHxDzJs5-C-pKFDEBQD6JbgxB=-xp7u143ekmgp...@mail.gmail.com%3E
> The ConfigSet used to create a collection should be read-only. Changes made
> via any of the Config APIs should only be applied to the collection where the
> operation is done and no to other collections that may be using the same
> ConfigSet. As discussed in the dev list:
> When a collection is created we should have two things, an immutable part
> (the ConfigSet) and a mutable part (configoverlay, generated schema, etc).
> The ConfigSet will still be placed in ZooKeeper under "/configs" but the
> mutable part should be placed under "/collections/$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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