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From: "Erick Erickson (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (SOLR-1306) Support pluggable
 persistence/loading of solr.xml details
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    [ https://issues.apache.org/jira/browse/SOLR-1306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496145#comment-13496145 ] 

Erick Erickson commented on SOLR-1306:
--------------------------------------

I'm thinking of committing this this weekend (to trunk, not 4.x yet) unless people object. I want to write a stress test and bang away at this thing first, and reconcile the CoreDescriptorProvider I came up with with the one already in there for Zookeeper.

Let me know
Erick
                
> 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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