Simon Willnauer created LUCENE-7300:
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Summary: 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
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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