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https://issues.apache.org/jira/browse/LUCENE-4870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13610979#comment-13610979
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Uwe Schindler commented on LUCENE-4870:
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I can do the 3.6.3 release if it is very urgent - takes me a few minutes to set
it up to build with Java 1.5 on my server (maybe a ES customer on 3.6 Lucene?).
> 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, 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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