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https://issues.apache.org/jira/browse/LUCENE-4190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13407148#comment-13407148
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Yonik Seeley commented on LUCENE-4190:
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bq. But I think this was premature, because a lot of questions and comments
came afterwards.
Except that if you read back through the issue, that's not what happened.
Anyway, if you're interested in consensus now, I don't see anyone opposed to
the underscore solution in the short term, even if some thought it didn't go
far enough. I didn't see anyone saying that deleting all files was preferable
in the short term.
So if there are no objections, I'll re-commit the underscore fix (which there
was consensus for), and then discussion can continue about better methods.
Robert, I'll repeat your own words back to you:
bq. We can maybe improve in the future besides the _ check, but I just think
this is an easy improvement that will prevent most of the problems.
> 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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