[jira] [Created] (LUCENE-4870) Lucene deletes entire index if and exception is thrown due do TooManyOpenFiles and OpenMode.CREATE_OR_APPEND

["Simon Willnauer (JIRA)" <ji...@apache.org>]

Simon Willnauer created LUCENE-4870:
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             Summary: 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: 4.2, 4.1, 4.0
            Reporter: Simon Willnauer
            Priority: Blocker
             Fix For: 5.0, 4.3, 4.2.1


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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