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https://issues.apache.org/jira/browse/LUCENE-4190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406640#comment-13406640
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Hoss Man commented on LUCENE-4190:
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bq. I think that the way to "bound" the namespace of files is to put everything
in a subdirectory of the index directory chosen by the user and control the
name of that subdirectory, making it clear that this is semi-private to Lucene
and that all files in that subdirectory are fair game.
isn't that in theory already the point of the index directory anyway? how far
down the rabit hole are we going to go?
bq. We won't delete directories, just files.
One sanity check: this may be an orthoginal issue, but is there anything
stoping a codec from using subdirectories? what if i have a codec that creates
"_mycodec/foo" and "_mycodec/bar" ... will those not get cleaned up?
> IndexWriter deletes non-Lucene files
> ------------------------------------
>
> Key: LUCENE-4190
> URL: https://issues.apache.org/jira/browse/LUCENE-4190
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Robert Muir
> Fix For: 4.0, 5.0
>
> Attachments: LUCENE-4190.patch, LUCENE-4190.patch
>
>
> Carl Austin raised a good issue in a comment on my Lucene 4.0.0 alpha blog
> post:
> http://blog.mikemccandless.com/2012/07/lucene-400-alpha-at-long-last.html
> IndexWriter will now (as of 4.0) delete all foreign files from the index
> directory. We made this change because Codecs are free to write to any files
> now, so the space of filenames is hard to "bound".
> But if the user accidentally uses the wrong directory (eg c:/) then we will
> in fact delete important stuff.
> I think we can at least use some simple criteria (must start with _, maybe
> must fit certain pattern eg _<base36>(_X).Y), so we are much less likely to
> delete a non-Lucene file....
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