[jira] Commented: (SOLR-725) CoreContainer/CoreDescriptor/SolrCore cleansing

["Noble Paul (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625286#action_12625286 ] 

Noble Paul commented on SOLR-725:
---------------------------------

I wish to know a few things.
 * Is anybody using the alias feature?
 * If yes , what is the usecase?

The alias feature implementation confuses me and the behavior seems to be very inconsistent. 
 

> CoreContainer/CoreDescriptor/SolrCore cleansing
> -----------------------------------------------
>
>                 Key: SOLR-725
>                 URL: https://issues.apache.org/jira/browse/SOLR-725
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 1.3
>            Reporter: Henri Biestro
>         Attachments: solr-725.patch
>
>
> These 3 classes and the name vs alias handling are somewhat confusing.
> The recent SOLR-647 & SOLR-716 have created a bit of a flux.
> This issue attemps to clarify the model and the list of operations. 
> h3. CoreDescriptor: describes the parameters of a SolrCore
> h4. Definitions
> * has one name
> 	** The CoreDescriptor name may represent multiple aliases; in that case, first alias is the SolrCore name
> * has one instance directory location
> * has one config & schema name
> h4. Operations
> The class is only a parameter passing facility
> h3. SolrCore: manages a Lucene index
> h4. Definitions
> * has one unique *name* (in the CoreContainer)
> **	the *name* is used in JMX to identify the core
> * has one current set of *aliases*
> **	the name is the first alias
> h4. Name & alias operations
> *	*get name/aliases*: obvious
> *	*alias*: adds an alias to this SolrCore
> *	*unalias*: removes an alias from this SolrCore
> *	*name*: sets the SolrCore name
> **		potentially impacts JMX registration
> *	*rename*: picks a new name from the SolrCore aliases
> **		triggered when alias name is already in use
> h3. CoreContainer: manages all relations between cores & descriptors
> h4. Definitions
> * has a set of aliases (each of them pointing to one core)
> **	ensure alias uniqueness.
> h4. SolrCore instance operations
> *	*load*: makes a SolrCore available for requests
> **		creates a SolrCore
> **		registers all SolrCore aliases in the aliases set
> **		(load = create + register)
> *	*unload*: removes a core idenitified by one of its aliases
> **		stops handling the Lucene index
> **		all SolrCore aliases are removed
> *	*reload*: recreate the core identified by one of its aliases
> *	*create*: create a core from a CoreDescriptor
> **		readies up the Lucene index
> *	*register*: registers all aliases of a SolrCore
> 			
> h4. SolrCore  alias operations
> *	*swap*: swaps 2 aliases
> **		method: swap
> *	*alias*: creates 1 alias for a core, potentially unaliasing a previously used alias
> **		The SolrCore name being an alias, this operation might trigger a SolrCore rename
> *	*unalias*: removes 1 alias for a core
> **		The SolrCore name being an alias, this operation might trigger a SolrCore rename
> 			

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