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https://issues.apache.org/jira/browse/LUCENE-4190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13407001#comment-13407001
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Carl Austin commented on LUCENE-4190:
-------------------------------------
I was the original commenter on the blog about this issue and have previously
experienced the deletion of all files on a drive because of the exact same
restriction - the fallout from this is massive.
The issue here is that many people who use lucene will not realise that this
can happen, and this situation will occur sooner or later. You can't expect
that every developer who uses lucene will understand every in and out, read
every bit of javadoc fully or every release change note. Look at the number of
posts to the mailing list that are just people who haven't fully read or
understood something. I firmly believe that this has to be handled by the
library such that a simple mistake or misunderstanding by a developer does not
lead to the loss of important files.
> 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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