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https://issues.apache.org/jira/browse/SOLR-13583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16878733#comment-16878733
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Andrzej Bialecki commented on SOLR-13583:
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Right, I didn't notice the error code - I'll fix it in a moment.
> Impossible to delete a collection with the same name as an existing alias
> -------------------------------------------------------------------------
>
> Key: SOLR-13583
> URL: https://issues.apache.org/jira/browse/SOLR-13583
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 8.1, 8.1.1
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Blocker
> Fix For: 8.1.2
>
> Attachments: SOLR-13583.patch, SOLR-13583.patch
>
>
> SOLR-13262 changed the behavior of most collection admin commands so that
> they always resolve aliases by default. In most cases this is desireable
> behavior but it also prevents executing commands on the collections that have
> the same name as an existing alias (which usually points to a different
> collection).
> This behavior also breaks the REINDEXCOLLECTION command with
> {{removeSource=true,}} which can also lead to data loss.
> This issue can be resolved by adding either an opt-in or opt-out flag to the
> collection admin commands that specifies whether the command should attempt
> resolving the provided name as an alias first. From the point of view of ease
> of use this could be an opt-out option, from the point of view of data safety
> this could be an opt-in option.
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