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https://issues.apache.org/jira/browse/SOLR-12651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16575341#comment-16575341
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Tomás Fernández Löbbe commented on SOLR-12651:
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I'm wondering if this should be optional (even if default). Another approach 
would be to make sure if another restore happens for the same collection (a 
retry), it can continue where the previous one left off. I'm thinking this 
could be useful when restoring big collections, retrying would be faster than 
starting over. (I'm saying this without having looked at the code, just based 
on the title and description of this Jira)

> Restore collection should clean up if the operation failed
> ----------------------------------------------------------
>
>                 Key: SOLR-12651
>                 URL: https://issues.apache.org/jira/browse/SOLR-12651
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Varun Thacker
>            Priority: Major
>         Attachments: solr.log
>
>
> I had an index built off master ( 8.0 ) , and then tried restoring it to a 
> Solr running branch_7x ( by mistake ) instead of master.
> The restore operation failed  but then the collection was never cleaned up. 
> The collection was created , index copied over but was in an unreadable state 
> We should clean up all the state if a restore fails.



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