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https://issues.apache.org/jira/browse/LUCENE-2421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12862834#action_12862834
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Michael McCandless commented on LUCENE-2421:
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bq. Well ... I think they'd appreciate the sleep instead of the immediate
exception. Previuosly, I've been asked by customers to do that in other places.
A 100ms sleep is barely noticeable (being so rare), but an exception definitely
is
Yeah I agree we should try to be robust to the "diverse" installations out
there, like AVs that tie up our files.
bq. For the regular lock, we've already agreed we cannot leave it behind as it
will prevent future locking
Wait, how come? (SimpleFSLF does this, but native gets a "real" lock).
bq. For the test lock I catch the exception in acquireTestLock and call
deleteOnExit() suppressing the exception.
OK.
> 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: 3.1
>
> Attachments: 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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