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From "Andi Vajda (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4190) IndexWriter deletes non-Lucene files
Date Wed, 04 Jul 2012 13:42:34 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406521#comment-13406521
] 

Andi Vajda commented on LUCENE-4190:
------------------------------------

I think that the way to "bound" the namespace of files is to put everything in a subdirectory
of the index directory chosen by the user and control the name of that subdirectory, making
it clear that this is semi-private to Lucene and that all files in that subdirectory are fair
game.
                
> 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
>
>         Attachments: 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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