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https://issues.apache.org/jira/browse/SOLR-1028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528011#comment-13528011
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Erick Erickson commented on SOLR-1028:
--------------------------------------

Has anyone with a machine that testLazyCores used to fail on seen failures 
since I committed my attempt at a fix? I committed SOLR-4149 last week, don't 
quite know if it's had enough time to really say it's fixed, unless we're 
seeing more failures....

FWIW, if it's what I think it was, it was a test artifact rather than the 
underlying code. I can hope anyway.
                
> 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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