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From "Jose Faria (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-1293) Support for large no:of cores and faster loading/unloading of cores
Date Mon, 09 Jul 2012 02:21:34 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409131#comment-13409131
] 

Jose Faria commented on SOLR-1293:
----------------------------------

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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