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From "Native Policeman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2791) WindowsDirectory
Date Fri, 03 Dec 2010 12:07:11 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966503#action_12966503
] 

Native Policeman commented on LUCENE-2791:
------------------------------------------

bq. If lpOverlapped is not NULL, the read operation starts at the offset that is specified
in the OVERLAPPED structure and ReadFile does not return until the read operation is complete.
The system updates the OVERLAPPED offset before ReadFile returns.

Thanks, I missed that. Sorry - the idea is simply to make positioned reads, I understand that.

> 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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