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https://issues.apache.org/jira/browse/SOLR-1028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13533117#comment-13533117
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Shawn Heisey commented on SOLR-1028:
------------------------------------

Further thought -- I believe that the solr.xml file was rewritten when I did a 
swap between seven pairs of cores sequentially on my last rebuild yesterday.  
If the first swap rewrote the solr.xml with swappable=false, then I am 
wondering how the other six swaps were able to complete.  Perhaps it's not 
really being enforced?

                
> Automatic core loading unloading for multicore
> ----------------------------------------------
>
>                 Key: SOLR-1028
>                 URL: https://issues.apache.org/jira/browse/SOLR-1028
>             Project: Solr
>          Issue Type: New Feature
>          Components: multicore
>    Affects Versions: 4.0, 5.0
>            Reporter: Noble Paul
>            Assignee: Erick Erickson
>             Fix For: 4.1, 5.0
>
>         Attachments: jenkins.jpg, SOLR-1028.patch, SOLR-1028.patch, 
> SOLR-1028_testnoise.patch
>
>
> usecase: I have many small cores (say one per user) on a single Solr box . 
> All the cores are not be always needed . But when I need it I should be able 
> to directly issue a search request and the core must be STARTED automatically 
> and the request must be served.
> This also requires that I must have an upper limit on the no:of cores that 
> should be loaded at any given point in time. If the limit is crossed the 
> CoreContainer must unload a core (preferably the least recently used core)  
> There must be a choice of specifying some cores as fixed. These cores must 
> never be unloaded 

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