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https://issues.apache.org/jira/browse/LUCENE-2421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shai Erera updated LUCENE-2421:
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Attachment: LUCENE-2421-2.patch
Patch fixes clearLock to first release the lock and then delete it. If the
release fails, it means another process is holding the lock and therefore we
shouldn't fail. If the delete fails, it ignores it.
I plan to commit shortly.
> Hardening of NativeFSLock
> -------------------------
>
> Key: LUCENE-2421
> URL: https://issues.apache.org/jira/browse/LUCENE-2421
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Shai Erera
> Assignee: Shai Erera
> Fix For: 2.9.3, 3.0.2, 3.1, 4.0
>
> Attachments: LUCENE-2421-2.patch, LUCENE-2421.patch,
> LUCENE-2421.patch, LUCENE-2421.patch, LUCENE-2421.patch
>
>
> NativeFSLock create a test lock file which its name might collide w/ another
> JVM that is running. Very unlikely, but still it happened a couple of times
> already, since the tests were parallelized. This may result in a false
> exception thrown from release(), when the lock file's delete() is called and
> returns false, because the file does not exist (deleted by another JVM
> already). In addition, release() should give a second attempt to delete() if
> it fails, since the file may be held temporarily by another process (like
> AntiVirus) before it fails. The proposed changes are:
> 1) Use ManagementFactory.getRuntimeMXBean().getName() as part of the test
> lock name (should include the process Id)
> 2) In release(), if delete() fails, check if the file indeed exists. If it
> is, let's attempt a re-delete() few ms later.
> 3) If (3) still fails, throw an exception. Alternatively, we can attempt a
> deleteOnExit.
> I'll post a patch later today.
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