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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1658) Absorb NIOFSDirectory into FSDirectory
Date Mon, 01 Jun 2009 15:14:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715110#action_12715110
] 

Uwe Schindler commented on LUCENE-1658:
---------------------------------------

bq. Maybe don't make MMapDir.cleanUnmapping final, so subclasses could tweak it? I'm still
nervous about throwing IOException from that method if the unmap fails, but if we make it
non-final then we can leave the IOException as is and users can subclass it if need be. 

I reactivated this exception (it was disabled before). In my opinion, we should enable it
to notify the user on any problems (e.g. that he may must raise security privileges to enable
it correctly). If the user hits an IOException, he can switch off the tweak easily. By the
way, switching on the tweak throws IAE if the platform does not support it.

cleanUnmapping is currently not really overrideable, because package-private. I can unfinal
it and make protected, if needed (I wanted to hide this dangerous method from other usages,
not that anyboy calls it for own ByteBuffers and crashes his JVM).

I will do the other changes, no problem.

> 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-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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