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https://issues.apache.org/jira/browse/LUCENE-1658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714869#action_12714869
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Uwe Schindler commented on LUCENE-1658:
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To conclude:
The error, I found is only relevant, if the string-type dir arguments to
IndexReader are passed to FSDir.open() and are separate instances without
refcounting. The reopen code sometimes closes the directory, although it should
not, which leads to problems, if the directories are separate instances.
With cached dirs, its no problem. So if we deprecate the string directory
arguments and inside that methods let FSDir.getDirectory() stay alive, we have
no problem. In 3.0, one could then remove all this code like
refcounting/changing dirs and the everywhere arguments closeDirectory in
SegmentReader/DirectoryIndexReader/MultiSegmentReader/... Then 1453 is
completely solved.
> Absorb NIOFSDirectory into FSDirectory
> --------------------------------------
>
> Key: LUCENE-1658
> URL: https://issues.apache.org/jira/browse/LUCENE-1658
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Store
> Reporter: Michael McCandless
> Assignee: Uwe Schindler
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1658-take2.patch, LUCENE-1658-take2.patch,
> LUCENE-1658.patch, LUCENE-1658.patch, LUCENE-1658.patch
>
>
> I think whether one uses java.io.* vs java.nio.* or eventually
> java.nio2.*, or some other means, is an under-the-hood implementation
> detail of FSDirectory and doesn't merit a whole separate class.
> I think FSDirectory should be the core class one uses when one's index
> is in the filesystem.
> So, I'd like to deprecate NIOFSDirectory, absorbing it into
> FSDirectory, and add a setting "useNIO" to FSDirectory. It should
> default to "true" for non-Windows OSs, because it gives far better
> concurrent performance on all platforms but Windows (due to known Sun
> JRE issue http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6265734).
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