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https://issues.apache.org/jira/browse/SOLR-1306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497010#comment-13497010
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Noble Paul commented on SOLR-1306:
----------------------------------
Please keep in mind that keeping all cores in the directory is not feasible if
you have 10's of K cores. The file system ends up being very slow with that
many no:of directories. So, we had to put the cores in 'n' different buckets to
overcome the performance issue
> Support pluggable persistence/loading of solr.xml details
> ---------------------------------------------------------
>
> Key: SOLR-1306
> URL: https://issues.apache.org/jira/browse/SOLR-1306
> Project: Solr
> Issue Type: New Feature
> Components: multicore
> Reporter: Noble Paul
> Assignee: Erick Erickson
> Fix For: 4.1
>
> Attachments: SOLR-1306.patch, SOLR-1306.patch, SOLR-1306.patch,
> SOLR-1306.patch
>
>
> Persisting and loading details from one xml is fine if the no:of cores are
> small and the no:of cores are few/fixed . If there are 10's of thousands of
> cores in a single box adding a new core (with persistent=true) becomes very
> expensive because every core creation has to write this huge xml.
> Moreover , there is a good chance that the file gets corrupted and all the
> cores become unusable . In that case I would prefer it to be stored in a
> centralized DB which is backed up/replicated and all the information is
> available in a centralized location.
> We may need to refactor CoreContainer to have a pluggable implementation
> which can load/persist the details . The default implementation should
> write/read from/to solr.xml . And the class should be pluggable as follows in
> solr.xml
> {code:xml}
> <solr>
> <dataProvider class="com.foo.FooDataProvider" attr1="val1" attr2="val2"/>
> </solr>
> {code}
> There will be a new interface (or abstract class ) called SolrDataProvider
> which this class must implement
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