[jira] Commented: (SOLR-215) Multiple Solr Cores

["Otis Gospodnetic (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12492836 ] 

Otis Gospodnetic commented on SOLR-215:
---------------------------------------

I think Henri accidentally resolved this. Reopening.
Btw. I'm *very* interested in serving multiple indices under a single Solr instance, possibly even embedded as described on the wiki or in SOLR-212. I may not find the time to look at the patch before next week, though.

> Multiple Solr Cores
> -------------------
>
>                 Key: SOLR-215
>                 URL: https://issues.apache.org/jira/browse/SOLR-215
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Henri Biestro
>            Priority: Minor
>         Attachments: solr-trunk-533775.patch, solr-trunk-src.patch
>
>
> Allow multiple cores in one web-application (or one class-loader):
> This allows to have multiple cores created from different config & schema in the same application.
> The side effect is that this also allows different indexes.
> Implementation notes for the patch:
> The patch allows to have multiple 'named' cores in the same application.
> The current single core behavior has been retained  - the core named 'null' - but code could not be kept 100% compatible. (In particular, Solrconfig.config is gone; SolrCore.getCore() is still here though).
> A few classes were only existing as singletons and have thus been refactored.
> The Config class feature-set has been narrowed to class loading relative to the installation (lib) directory;
> The SolrConfig class feature-set has evolved towards the 'solr config' part, caching frequently accessed parameters;
> The IndexSchema class uses a SolrConfig instance; there are a few parameters in the configuration that pertain to indexing that were needed.
> The SolrCore is built from a SolrConfig & an IndexSchema.
> The creation of a core has become:
> //create a configuration
> SolrConfig config = SolrConfig.createConfiguration("solrconfig.xml");
> //create a schema
> IndexSchema schema = new IndexSchema(config, "schema0.xml");
> //create a core from the 2 other.
> SolrCore core = new SolrCore("core0", "/path/to/index", config, schema);
> //Accessing a core:
> SolrCore core = SolrCore.getCore("core0");
> There are few other changes mainly related to passing through constructors the SolrCore/SolrConfig used.
> Some background on the 'whys':
> http://www.nabble.com/Multiple-Solr-Cores-tf3608399.html#a10082201
> http://www.nabble.com/Embedding-Solr-vs-Lucene%2C-multiple-Solr-cores--tf3572324.html#a9981355

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