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https://issues.apache.org/jira/browse/SOLR-16547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17634078#comment-17634078
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Jan Høydahl commented on SOLR-16547:
------------------------------------

Your very example in the issue description was configSet :)  Can you give 
another example where sharing some state would cause users to see different 
behavior? I believe optimizations like this have potential, but should 
preferably be done in a way that will benefit all users, without hiding it 
behind feature toggles?

> Share and reuse all possible Objects between cores
> --------------------------------------------------
>
>                 Key: SOLR-16547
>                 URL: https://issues.apache.org/jira/browse/SOLR-16547
>             Project: Solr
>          Issue Type: Task
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Noble Paul
>            Priority: Major
>
> The objective is to minimize the heap usage where nodes host very large 
> number of cores.
> A very common usecase is where all (or a lot of cores ) in a node uses the 
> same configset. . We will make this an opt-in feature so that a common user 
> wouldn't see a different behaviour.
> To enable this feature, add the following flag to {{solrconfig.xml}}
> {{<shareCoreData>true</shareCoreData>}}
>  
> I shall open sub-tickets to enable sharing of specific objects



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