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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4190) IndexWriter deletes non-Lucene files
Date Wed, 04 Jul 2012 13:16:34 GMT
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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