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https://issues.apache.org/jira/browse/SOLR-10826?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Owen updated SOLR-10826:
----------------------------
    Attachment: SOLR-10826.patch

OK I've expanded the test a bit, it now creates a second collection, and alias 
for it, and a combined alias spanning both. Then it tests the various 
combinations of {{collection=...}} values work as expected. Again, these tests 
do fail without the code fix.

> CloudSolrClient using unsplit collection list when expanding aliases
> --------------------------------------------------------------------
>
>                 Key: SOLR-10826
>                 URL: https://issues.apache.org/jira/browse/SOLR-10826
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrJ
>    Affects Versions: 6.4, 6.5.1, 6.6
>            Reporter: Tim Owen
>            Assignee: Varun Thacker
>         Attachments: SOLR-10826.patch, SOLR-10826.patch, SOLR-10826.patch
>
>
> Some recent refactoring seems to have introduced a bug in SolrJ's 
> CloudSolrClient, when it's expanding a collection list and resolving aliases, 
> it's using the wrong local variable for the alias lookup. This leads to an 
> exception because the value is not an alias.
> E.g. suppose you made a request with {{&collection=x,y}} where either or both 
> of {{x}} and {{y}} are not real collection names but valid aliases. This will 
> fail, incorrectly, because the lookup is using {{x,y}} as a potential alias 
> name lookup.
> Patch to fix this attached, which was tested locally and fixed the issue.



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