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https://issues.apache.org/jira/browse/SOLR-7127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14329726#comment-14329726
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Shawn Heisey commented on SOLR-7127:
------------------------------------

Thinking out loud:  If defaultCollection were changed to final, would that get 
around the original visibility problem that required making it volatile?  It 
*would* make it impossible to change it after setting it once, which would give 
the programmer a clue that they are trying to use it in a way that's 
inconsistent with the intent.


> Add method to CloudSolrClient to create per-collection clients
> --------------------------------------------------------------
>
>                 Key: SOLR-7127
>                 URL: https://issues.apache.org/jira/browse/SOLR-7127
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Alan Woodward
>            Assignee: Alan Woodward
>            Priority: Minor
>         Attachments: SOLR-7127.patch, SOLR-7127.patch
>
>
> CloudSolrClient isn't thread-safe if you're making requests to multiple 
> collections, because defaultCollection is mutable.  This can be a pain if 
> you're trying to index into multiple collections from a single queue of 
> documents.
> This issue adds a .getCollectionClient(String) method to CloudSolrClient that 
> returns a child client directed at that collection.  Under the hood it's 
> another CloudSolrClient sharing it's resources with the parent client, but 
> with a separate default collection set.  The method returns a SolrClient, 
> however, so you can't then change the collection unless you explicitly cast 
> it.
> Sort of related to what I wanted to do on SOLR-6894, but this is more 
> focussed.



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