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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1877) Improve IndexWriter javadoc on locking
Date Mon, 31 Aug 2009 10:50:32 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749459#action_12749459
] 

Michael McCandless commented on LUCENE-1877:
--------------------------------------------

I think we should also fix NativeLockFactory so that if the write lock is in the index dir
it doesn't generate the large digest in the file name.  That digest is problematic when two
different machines access the same physical dir via different mount names, since that results
in different lock file names.

> 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
>
>         Attachments: LUCENE-1877.patch
>
>
> 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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