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https://issues.apache.org/jira/browse/LUCENE-1877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749336#action_12749336
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Mark Miller commented on LUCENE-1877:
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bq. People who use Lucene over NFS already have to do special things (eg make a
custom deletion policy), and far too many users hit the "leftover lock file"
problem. We could state in the javadocs that this default will change in 3.0?
+1 from me - if it made things work out of the box with NFS, I'd vote to keep
as is, but the points you mention were in my head too.
My only worry is current users counting on this default for NFS - but if we put
it in the back compat break section (a break in regards to NFS anyway), that
should be sufficient warning?
> Improve IndexWriter javadoc on locking
> --------------------------------------
>
> Key: LUCENE-1877
> URL: https://issues.apache.org/jira/browse/LUCENE-1877
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Javadocs
> Reporter: Mark Miller
> Priority: Trivial
> Fix For: 2.9
>
>
> A user requested we add a note in IndexWriter alerting the availability of
> NativeFSLockFactory (allowing you to avoid retaining locks on abnormal jvm
> exit). Seems reasonable to me - we want users to be able to easily stumble
> upon this class. The below code looks like a good spot to add a note - could
> also improve whats there a bit - opening an IndexWriter does not necessarily
> create a lock file - that would depend on the LockFactory used.
> {code} <p>Opening an <code>IndexWriter</code> creates a lock file for the
> directory in use. Trying to open
> another <code>IndexWriter</code> on the same directory will lead to a
> {...@link LockObtainFailedException}. The {...@link
> LockObtainFailedException}
> is also thrown if an IndexReader on the same directory is used to delete
> documents
> from the index.</p>{code}
> Anyone remember why NativeFSLockFactory is not the default over
> SimpleFSLockFactory?
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