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https://issues.apache.org/jira/browse/SOLR-11444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erick Erickson updated SOLR-11444:
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    Attachment: SOLR-11444.patch

Oops, attached the wrong patch last time.

> Improve Aliases.java and comma delimited collection list handling
> -----------------------------------------------------------------
>
>                 Key: SOLR-11444
>                 URL: https://issues.apache.org/jira/browse/SOLR-11444
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrCloud
>            Reporter: David Smiley
>            Assignee: David Smiley
>         Attachments: SOLR-11444.patch, SOLR_11444_Aliases.patch, 
> SOLR_11444_Aliases.patch
>
>
> While starting to look at SOLR-11299 I noticed some brittleness in 
> assumptions about Strings that refer to a collection.  Sometimes they are in 
> fact references to comma separated lists, which appears was added with the 
> introduction of collection aliases (an alias can refer to a comma delimited 
> list).  So Java's type system kind of goes out the window when we do this.  
> In one case this leads to a bug -- CloudSolrClient will throw an NPE if you 
> try to write to such an alias.  Sending an update via HTTP will allow it and 
> send it to the first in the list.
> So this issue is about refactoring and some little improvements pertaining to 
> Aliases.java plus certain key spots that deal with collection references.  I 
> don't think I want to go as far as changing the public SolrJ API except to 
> adding documentation on what's possible.



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