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https://issues.apache.org/jira/browse/SOLR-1293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409131#comment-13409131
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Jose Faria commented on SOLR-1293:
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I do not know if this is the right place, but on the wiki
http://wiki.apache.org/solr/LotsOfCores there is a note that this feature will
be available at 4.0, but since May it was moved to 4.1
> Support for large no:of cores and faster loading/unloading of cores
> -------------------------------------------------------------------
>
> Key: SOLR-1293
> URL: https://issues.apache.org/jira/browse/SOLR-1293
> Project: Solr
> Issue Type: New Feature
> Components: multicore
> Reporter: Noble Paul
> Fix For: 4.1
>
> Attachments: SOLR-1293.patch
>
>
> Solr , currently ,is not very suitable for a large no:of homogeneous cores
> where you require fast/frequent loading/unloading of cores . usually a core
> is required to be loaded just to fire a search query or to just index one
> document
> The requirements of such a system are.
> * Very efficient loading of cores . Solr cannot afford to read and parse and
> create Schema, SolrConfig Objects for each core each time the core has to be
> loaded ( SOLR-919 , SOLR-920)
> * START STOP core . Currently it is only possible to unload a core (SOLR-880)
> * Automatic loading of cores . If a core is present and it is not loaded and
> a request comes for that load it automatically before serving up a request
> * As there are a large no:of cores , all the cores cannot be kept loaded
> always. There has to be an upper limit beyond which we need to unload a few
> cores (probably the least recently used ones)
> * Automatic allotment of dataDir for cores. If the no:of cores is too high al
> the cores' dataDirs cannot live in the same dir. There is an upper limit on
> the no:of dirs you can create in a unix dir w/o affecting performance
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