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https://issues.apache.org/jira/browse/LUCENE-4746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13569562#comment-13569562
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Robert Muir commented on LUCENE-4746:
-------------------------------------
{quote}
This is useful for Lucene if you want to copy but don't need to keep around the
source file. Something very useful for addIndexes.
{quote}
For copy-free addIndexes(Directory...) we could improve FSDir's copy(Directory,
String, String) impl to try to create a hard link, and the existing impl would
work.
But on windows i think by default links dont work unless you are administrator,
and some other obscure filesystems probably dont support links either (but do
support rename).
And we'd need to be fully on java7 (i think?).
So maybe we need a moveIndexes(Directory...) It could acquire the write lock on
all the source Directories and just move instead of copy (otehrwise its like
addIndexes).
> Create a move method in Directory.
> ----------------------------------
>
> Key: LUCENE-4746
> URL: https://issues.apache.org/jira/browse/LUCENE-4746
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Mark Miller
> Assignee: Mark Miller
> Fix For: 4.2, 5.0
>
>
> I'd like to make a move method for directory.
> We already have a move for Solr in DirectoryFactory, but it seems it belongs
> at the directory level really.
> The default impl can do a copy and delete, but most implementations will be
> able to optimize to a rename.
> Besides the move we do for Solr (to move a replicated index into place), it
> would also be useful for another feature I'd like to add - the ability to
> merge an index with moves rather than copies. In some cases, you don't
> need/want to copy all the files and could just rename/move them.
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