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https://issues.apache.org/jira/browse/LUCENE-4638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13538724#comment-13538724
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Michael McCandless commented on LUCENE-4638:
--------------------------------------------
bq. simply making the lock factory protected exposes it in an advanced enough
way that it couldnt be considered dangerous. That would let me gid rid of this
bug as well.
I think that's a good solution for this issue?
It would still be nice to know if rollback resolves it (it's supposed to!), and
why the 2nd IW.close() hangs (which is *weird*).
> If IndexWriter is interrupted on close and is using a channel (mmap/nio), it
> can throw a ClosedByInterruptException and prevent you from opening a new
> IndexWriter in the same proceses if you are using Native locks.
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-4638
> URL: https://issues.apache.org/jira/browse/LUCENE-4638
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Mark Miller
> Priority: Minor
> Fix For: 4.1, 5.0
>
> Attachments: LUCENE-4638.patch
>
>
> The ClosedByInterruptException will prevent the index from being unlocked in
> close. If you try and close again, the call will hang. If you are using
> native locks and try to open a new IndexWriter, it will fail to get the lock.
> If you try IW#forceUnlock, it wont work because the not fully closed IW will
> still have the lock.
> ideas:
> * On ClosedByInterruptException, IW should continue trying to close what it
> can and unlock the index? Generally I have see the exception trigger in
> commitInternal.
> * We should add a non static forceUnlock to IW that lets you remove the lock
> and start a new IW?
> * We should make the lock protected so IW sub classes could unlock the index
> in advanced use cases?
> * others?
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