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https://issues.apache.org/jira/browse/LUCENE-4870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13610285#comment-13610285
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Michael McCandless commented on LUCENE-4870:
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+1, thanks Simon!
Can you reference this Jira in the comment, and eg say "we may have hit false
FNFE due to too many open files".
Maybe drop the 1000 iters lower in the test? The test is a bit slowish ...
> Lucene deletes entire index if and exception is thrown due do
> TooManyOpenFiles and OpenMode.CREATE_OR_APPEND
> ------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-4870
> URL: https://issues.apache.org/jira/browse/LUCENE-4870
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.0, 4.1, 4.2, 3.6.2
> Reporter: Simon Willnauer
> Priority: Blocker
> Fix For: 5.0, 4.3, 4.2.1
>
> Attachments: LUCENE-4870.patch, LUCENE-4870.patch
>
>
> The Lucene IndexWriter might delete an entire index if it hits a
> FileNotFoundException triggered by TooManyOpenFiles during IndexWriter
> creation. We try to figure out if the index exists already if the
> OpenMode.CREATE_OR_APPEND is set (which is default). Yet, the logic in
> DirectoryReader#indexExists(Directory) will just return false if we are not
> able to open the segment file. This will cause the IW to assume there is no
> index and it will try to create a new index there trashing all existing
> commit points treating this as a OpenMode.CREATE.
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