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https://issues.apache.org/jira/browse/LUCENE-4746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13569576#comment-13569576
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Robert Muir commented on LUCENE-4746:
-------------------------------------
{quote}
No matter what moveIndexes will be unsafe right? Meaning if you hit an exc part
way through then some or all of your source indices are corrupt ... the dest
index should be fine though (and, should only reflect all or none of the
additions I think).
{quote}
Yeah at least i think it has to be. even if added complex crap and tried to
move files back etc, someone could run out of disk space during the process or
all kinds of other possibilities.
I think in general speeding up addIndexes to be more efficient (and still safe)
is most attractive. But i know some systems cant support hard linking so i
think it would be good to have a more generally fast method for them. Maybe
there is a way it wouldnt have to be on indexwriter as well (but a tool in
contrib), i dont know.
> 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
>
> Attachments: LUCENE-4746.patch
>
>
> 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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