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From Ted McFadden <>
Subject Issue Lucene-2421 and NativeFSLockFactory.clearLock behaviour?
Date Wed, 07 Jul 2010 05:59:03 GMT

For Lucene 3.0.2, issue LUCENE-2421 ( changed
NativeFSLock.release to not raise an exception if a write.lock file could
not be deleted since the presence of the file itself does not mean a lock is

Should NativeFSLockFactory.clearLock also be changed to not raise an
exception if it can't delete the write.lock file? The comments in the
clearLock method seem to suggest the method is really no longer necessary,
but IndexWriter.init can still call it.

If the write.lock is held from deletion by antivirus or something as
described in LUCENE-2421, IndexWriter construction looks like it can fail
unnecessarily for the same reason:

            if (lockFile.exists() && !lockFile.delete()){
               throw new IOException("Cannot delete " + lockFile);

We have seen this exception path once in the wild (on a Windows box).

I can work around this with a custom LockFactory but thought I should check
if I'm reading the code right.



Ted McFadden
Chief Engineer

Leximancer Pty Ltd
Queensland, Australia

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