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Date: Mon, 22 Oct 2012 14:04:14 +0000 (UTC)
From: "Noble Paul (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <615475983.9743.1350914654137.JavaMail.jiratomcat@arcas>
Subject: [jira] [Commented] (SOLR-1293) Support for large no:of cores and
 faster loading/unloading of cores
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    [ https://issues.apache.org/jira/browse/SOLR-1293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13481372#comment-13481372 ] 

Noble Paul commented on SOLR-1293:
----------------------------------

Rdbms is not required. We ate managing that with the xml itself.  Now that we have moved to zookeeper for cloud, we should piggyback on zookeeper for everything
                
> 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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