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https://issues.apache.org/jira/browse/SOLR-16153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17521707#comment-17521707
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David Smiley commented on SOLR-16153:
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Yes; I definitely want to ensure that the Directory abstraction is consulted
such that a custom Directory can do its magic to make the copy cheap where that
is supported. Based on what I see for the shard split code, and this will use
similar logic, this already happens.
> 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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