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https://issues.apache.org/jira/browse/LUCENE-2104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789876#action_12789876
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Uwe Schindler commented on LUCENE-2104:
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+1 on exception.
The problem: NativeFSLockFactory is never possible to get the lock and release
it. This is only allowed for the code, that holds the lock (its the same like
with a sysnchonized mutex using j.l.concurrent.ReentrantLock, only code that
holds the lock can free it). So it is impossible to remove a lock, held by
another process but it may be possible to release if it is created in the same
JVM instance (for this to work, the factory needs a map of all generated locks).
> IndexWriter.unlock does does nothing if NativeFSLockFactory is used
> -------------------------------------------------------------------
>
> Key: LUCENE-2104
> URL: https://issues.apache.org/jira/browse/LUCENE-2104
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Shai Erera
> Fix For: 3.1
>
> Attachments: LUCENE-2104.patch
>
>
> If NativeFSLockFactory is used, IndexWriter.unlock will return, silently
> doing nothing. The reason is that NativeFSLockFactory's makeLock always
> creates a new NativeFSLock. NativeFSLock's release first checks if its lock
> is not null. However, only if obtain() is called, that lock is not null. So
> release actually does nothing, and so IndexWriter.unlock does not delete the
> lock, or fail w/ exception.
> This is only a problem in NativeFSLock, and not in other Lock
> implementations, at least as I was able to see.
> Need to think first how to reproduce in a test, and then fix it. I'll work on
> it.
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