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https://issues.apache.org/jira/browse/LUCENE-3365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082330#comment-13082330
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Geoff Cooney commented on LUCENE-3365:
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Glad I could help!
> Create or Append mode determined before obtaining write lock
> ------------------------------------------------------------
>
> Key: LUCENE-3365
> URL: https://issues.apache.org/jira/browse/LUCENE-3365
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 3.1, 3.2, 3.3
> Reporter: Geoff Cooney
> Assignee: Simon Willnauer
> Labels: IndexWriter
> Fix For: 3.4, 4.0
>
> Attachments: LUCENE-3365.patch, LUCENE-3365.patch
>
>
> If an IndexWriter("writer1") is opened in CREATE_OR_APPEND mode, it
> determines whether to CREATE or APPEND before obtaining the write lock. When
> another IndexWriter("writer2") is in the process of creating the index, this
> can result in writer1 entering create mode and then waiting to obtain the
> lock. When writer2 commits and releases the lock, writer1 is already in
> create mode and overwrites the index created by write2.
> This bug was probably effected by LUCENE-2386 as prior to that Lucene
> generated an empty commit when a new index was created. I think the issue
> could still have occurred prior to that but the two IndexWriters would have
> needed to be opened nearly simultaneously and the first IndexWriter would
> need to release the lock before the second timed out.
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