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https://issues.apache.org/jira/browse/SOLR-11444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16204226#comment-16204226
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David Smiley commented on SOLR-11444:
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No prob Erick; I'll investigate and see what's going wrong. BTW I didn't know
aliases could be named after existing collections! Seems like something
possibly hard to get right.
> 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_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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