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https://issues.apache.org/jira/browse/SOLR-1028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13552233#comment-13552233
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Yonik Seeley commented on SOLR-1028:
------------------------------------
I started a really quick review of the code, but the first method I visited
(CoreContainer.getCore()) seems to have a race condition?
Trying to open the same core more than once concurrently seems like it could
get pretty messy, and it doesn't seem like it's protected against. All one
would have to do is send in more than one request targeted toward the same core
around the same time to trigger it.
> 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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