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https://issues.apache.org/jira/browse/SOLR-16153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17521622#comment-17521622
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Ishan Chattopadhyaya commented on SOLR-16153:
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It might be useful to consider on filesystems where hard linking may not be 
available. Consider S3 based directory or a kubernetes based shared file system 
like ceph etc.

Maybe having both modes, file copy based and hard linking based, would be great.

> Clone Collection
> ----------------
>
>                 Key: SOLR-16153
>                 URL: https://issues.apache.org/jira/browse/SOLR-16153
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrCloud
>            Reporter: David Smiley
>            Priority: Major
>
> It should be possible to "clone" a collection, and to do so cheaply.  This 
> might be its own command or be an option of collection creation; either way, 
> it'd be great to support the vast majority of the same options of collection 
> creation.  A cloned collection should be the same in every way (shard ranges, 
> collection properties, replicas types and counts, etc.) unless configured to 
> be different (e.g. specify a different configSet).  Most importantly, a 
> cloned collection should have the same data, and this can be accomplished via 
> UNIX hard links (when supported) to the underlying files.  This would make 
> clones cheap!  A no-data option should be supported as well, useful when the 
> intended action is to re-index subsequently.



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