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https://issues.apache.org/jira/browse/SOLR-1575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526534#comment-13526534
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olivier soyez commented on SOLR-1575:
-------------------------------------

With trunk solr 5.0, all cores with loadOnStartup="false" in solr.xml :
- without any changes in the code :
15K cores server startup in 220115 ms   ~  4 min
50K cores server startup in 2925056 ms  ~  49 min

- with the change :
15K cores server startup in 8145 ms     ~  8 sec
50K cores server startup in 17211 ms    ~  17 sec

This little change is a big boost for the server startup ...
                
> loading solr.xml takes a lot of time when there are lot of cores
> ----------------------------------------------------------------
>
>                 Key: SOLR-1575
>                 URL: https://issues.apache.org/jira/browse/SOLR-1575
>             Project: Solr
>          Issue Type: Improvement
>          Components: multicore
>            Reporter: Noble Paul
>            Priority: Minor
>             Fix For: 1.5
>
>
> We have around 38K cores which takes up around 25 mins to start the server. 
> Keep in mind that no cores are started and this is the time taken for loading 
> the solr.xml.

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