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https://issues.apache.org/jira/browse/SOLR-5267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jan Høydahl closed SOLR-5267.
-----------------------------

    Resolution: Won't Fix

We'll most likely not spend any effort speeding up old-style loading of cores 
since this will go away with 5.x. Closing
                
> Solr.xml (persistent=true) - slows down when core increases beyond 3 - 5K
> -------------------------------------------------------------------------
>
>                 Key: SOLR-5267
>                 URL: https://issues.apache.org/jira/browse/SOLR-5267
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.3.1
>            Reporter: Prasad
>
> The response time of deploying new core increases to 40+ seconds, when 
> persistent=true is enabled in solr.xml.
> The issue seem to be due to iterations over the loop to add all existing 
> cores and then generated solr.xml
> org.apache.solr.core.CoreContainer.addPersistOneCore - calls to this function 
> need to be optimized.
> *Ideas*
> * Having only entries for loadOnStartup cores in solr.xml should be 
> sufficient.
> * Each core directory can have its properties.
> * Transient core lookup can be performed through this file.
> * There need a better way to track the all registered core (than XML).

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