Michael McCandless created LUCENE-4190:
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Summary: 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: Michael McCandless
Fix For: 4.0
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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