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https://issues.apache.org/jira/browse/LUCENE-7300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15299737#comment-15299737
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Dawid Weiss commented on LUCENE-7300:
-------------------------------------
This works as long as files are immutable (a hardlink to the same file would
still reflect changes to that file after it's created, whereas a copy is, well,
a copy), perhaps it's worth clarifying somehow (in the docs)?
> Add directory wrapper that optionally uses hardlinks in copyFrom
> ----------------------------------------------------------------
>
> Key: LUCENE-7300
> URL: https://issues.apache.org/jira/browse/LUCENE-7300
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 6.1
> Reporter: Simon Willnauer
> Fix For: 6.1
>
> Attachments: LUCENE-7300.patch
>
>
> Today we always do byte-by-byte copy in Directory#copyFrom. While this is
> reliable and should be the default, certain situations can be improved by
> using hardlinks if possible to get constant time copy on OS / FS that support
> such an operation. Something like this could reside in misc if it's contained
> enough since it requires LinkPermissions to be set and needs to detect if
> both directories are subclasses of FSDirectory etc.
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