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Posted to dev@lucene.apache.org by "Dawid Weiss (JIRA)" <ji...@apache.org> on 2016/05/25 09:27:12 UTC
[jira] [Commented] (LUCENE-7300) Add directory wrapper that
optionally uses hardlinks in copyFrom
[ https://issues.apache.org/jira/browse/LUCENE-7300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15299737#comment-15299737 ]
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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