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Date: Fri, 3 Dec 2010 04:29:11 -0500 (EST)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-2791) WindowsDirectory
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    [ https://issues.apache.org/jira/browse/LUCENE-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966459#action_12966459 ] 

Michael McCandless commented on LUCENE-2791:
--------------------------------------------

This is awesome!  It gives us a workaround to the JRE bug (http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6265734) killing NIOFSDir's concurrency on Windows.

Does is also allow for deletion of still-open files?

You may want to experiment w/ different buffer sizes to see if that impacts performance.

Also: this allows you to do the equivalent of Linux's O_DIRECT, right?  If so... I think we should augment the Dir API so that on opening an input it receives some sort of IOContext or something expressing why we are opening.  So for merging we would want "direct iO" (bypass OS buffer cache or NOREUSE fadvise flag, etc.), and larger buffer sizes and perhaps other low level IO settings in the future.

> WindowsDirectory
> ----------------
>
>                 Key: LUCENE-2791
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2791
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Store
>            Reporter: Robert Muir
>         Attachments: LUCENE-2791.patch, LUCENE-2791.patch, WindowsDirectory.dll, WindowsDirectory_amd64.dll
>
>
> We can use Windows' overlapped IO to do pread() and avoid the performance problems of SimpleFS/NIOFSDir.

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