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https://issues.apache.org/jira/browse/LUCENE-2476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871206#action_12871206
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Cservenak, Tamas commented on LUCENE-2476:
------------------------------------------

I tried both IndexWriter#unlock and 
Directory#cleanLock(IndexWriter.WRITE_LOCK_NAME) but non of those removed the 
entry from LOCK_HELD HashSet. It was unchanged.

The NativeFSLock#release() was returning false in both cases.

So, this is what I meant by "provide some circumvention", since up to now, I 
did not figure out any other means to remove the entry from LOCK_HELD. All of 
these did _not_ remove it.

> Constructor of IndexWriter let's runtime exceptions pop up, while keeping the 
> writeLock obtained
> ------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2476
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2476
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 3.0.1
>            Reporter: Cservenak, Tamas
>            Assignee: Michael McCandless
>            Priority: Blocker
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2476.patch
>
>
> Constructor of IndexWriter let's runtime exceptions pop up, while keeping the 
> writeLock obtained.
> The init method in IndexWriter catches IOException only (I got 
> NegativeArraySize by reading up a _corrupt_ index), and now, there is no way 
> to recover, since the writeLock will be kept obtained. Moreover, I don't have 
> IndexWriter instance either, to "grab" the lock somehow, since the init() 
> method is called from IndexWriter constructor.
> Either broaden the catch to all exceptions, or at least provide some 
> circumvention to clear up. In my case, I'd like to "fallback", just delete 
> the corrupted index from disk and recreate it, but it is impossible, since 
> the LOCK_HELD NativeFSLockFactory's entry about obtained WriteLock is _never_ 
> cleaned out and is no (at least apparent) way to clean it out forcibly. I 
> can't create new IndexWriter, since it will always fail with 
> LockObtainFailedException.

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