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https://issues.apache.org/jira/browse/LUCENE-1658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714902#action_12714902
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Uwe Schindler commented on LUCENE-1658:
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Oh shit, on windows, a very lot of tests are failing with MMap. Windows says,
you cannot delete or modify files, which have a mapping, with Solaris it works
without problems:
e.g. TestAtomicUpdates:
[junit] C:\Projects\lucene\trunk\build\test\19.cfs\_12.cfs (Der Vorgang ist
bei einer Datei mit einem geöffneten Bereich, der einem Benutzer zugeordnet ist,
nicht anwendbar)
The problem is, that a memory mapped area is not released on close() in Java,
it is released, when GC frees it.
So the problem may be that MMap can only be used for *reading* indexes (so only
read-only IndexReaders) on windows.
What should we do, again disable MMap and only use NIOFSDir?
> 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.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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