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https://issues.apache.org/jira/browse/LUCENE-7300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15306501#comment-15306501
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Michael McCandless commented on LUCENE-7300:
--------------------------------------------
OK I see the problem ... looks like a test bug: with this seed,
{{newFSDirectory}} returned an {{NRTCachingDirectory}} but the test assumes
when it creates the output {{foo.bar}} that it'll write through to the file
system ... I'll fix by adding a {{sync}} call to force it.
> 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
> Assignee: Simon Willnauer
> Fix For: 6.1, master (7.0)
>
> Attachments: LUCENE-7300.patch, 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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