lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2791) WindowsDirectory
Date Fri, 03 Dec 2010 11:53:10 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966496#action_12966496
] 

Robert Muir commented on LUCENE-2791:
-------------------------------------

{quote}
To my above comment and OVERLAPPED in my opinion not realy used (as not async):
Reading http://msdn.microsoft.com/en-us/library/aa365467(VS.85).aspx#synchronization_and_file_position
it seems to behave little different when OVERLAPPED is non-null for synchronous reads (as
we do currently). But as you never read the contents og OVERLAPPED after the function call,
why pass it in? Please explain 
{quote}

To position the read versus seeking the file. This is explained in the documentation on that
very same page!:

Considerations for working with *synchronous* file handles:

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.


> 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.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org


Mime
View raw message