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https://issues.apache.org/jira/browse/SOLR-1028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13533137#comment-13533137
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Shawn Heisey edited comment on SOLR-1028 at 12/15/12 8:11 PM:
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Erick, thank you for the clarification. Mild panic unjustified. :)
The mild panic however did uncover a possible problem for you to investigate.
If loadOnStartup=true and swappable=true, none of the cores get loaded on
startup. Once one is accessed, it does get loaded. This is on branch_4x
revision 1421496.
The wiki currently has the following about this combination:
loadOnStartup=true swappable=true: There are some cores you want loaded when
the server first starts up, but that you'll allow to be swapped out. It's
wasteful to specify more cores like this than your swappableCacheSize value.
was (Author: elyograg):
Erick, thank you for the clarification. Mild panic unjustified. :)
The mild panic however did uncover a possible problem for you to investigate.
If loadOnStartup=true and swappable=true, none of the cores get loaded on
startup. Once one is accessed, it does get loaded.
This is what the wiki currently says about this combination:
loadOnStartup=true swappable=true: There are some cores you want loaded when
the server first starts up, but that you'll allow to be swapped out. It's
wasteful to specify more cores like this than your swappableCacheSize value.
> 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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