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https://issues.apache.org/jira/browse/LUCENE-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966489#action_12966489
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Uwe Schindler commented on LUCENE-2791:
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bq. 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
Thats different to O_DIRECT. FS caches are still used by windows, but there are
also options to disable this: FILE_FLAG_WRITE_THROUGH
[http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx]
> 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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