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

    [ https://issues.apache.org/jira/browse/LUCENE-4190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406497#comment-13406497
] 

Michael McCandless commented on LUCENE-4190:
--------------------------------------------

History repeats itself: LUCENE-385.
                
> 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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