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https://issues.apache.org/jira/browse/LUCENE-1658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715074#action_12715074
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Michael McCandless commented on LUCENE-1658:
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I'm thinking MMapDirectory is too problematic to return by default from open(),
because of the unexpected increase transient disk usage.
I think we should add the hack to MMapDir, disabled by default, and add a
setter to enable it (with javadocs clear about the warnings). When used
appropriately it can make MMapdir very usable, as a workaround until Sun fixes
the bug.
So I think we should:
* Fix open to return NIOFSDir on all non-Windows plaforms, and SimpleFSDir on
Windows
* Document the sun bug in MMapDir & FSDir
* Include hack in MMapDir, disabled by default
> 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-take3.patch, LUCENE-1658-take3.patch, LUCENE-1658-take3.patch,
> LUCENE-1658-take3.patch, LUCENE-1658-take3.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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