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https://issues.apache.org/jira/browse/LUCENE-4190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13407170#comment-13407170
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Uwe Schindler commented on LUCENE-4190:
---------------------------------------
{quote}
bq. Assert makes no sense here as it does not prevent people from doing the
wrong thing.
I don't agree: i at first thought to do a hard check, but this is only really
necessary for codec developers. So an assert
is enough, because you catch it when developing your codec (its either gonna
work, or completely not work here).
{quote}
Why not make it a hard check, otherwise one could write a file without _ and
schwupps, it's wech :) (German). Why only an assert? If we require all files
start with _ lets enorce it, otherwise delete all files like we do currently.
Using an assert would get my -1 to commit this again.
> 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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