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From "Bert Huijben" <b...@qqmail.nl>
Subject RE: pristine store design
Date Wed, 03 Mar 2010 14:34:58 GMT


> -----Original Message-----
> From: Ivan Zhakov [mailto:ivan@visualsvn.com]
> Sent: woensdag 3 maart 2010 15:22
> To: Bert Huijben
> Cc: Stefan Sperling; Julian Foad; Neels J Hofmeyr; Greg Stein;
> dev@subversion.apache.org
> Subject: Re: pristine store design
> 
> On Wed, Mar 3, 2010 at 3:54 PM, Bert Huijben <bert@qqmail.nl> wrote:
> > On posix, when using svn_io_rename_file() this would be true and this
> would
> > be pretty safe.
> >
> > On Windows you get an access denied (bad) and a 15 second delay retrying
> the
> > move (worse).
> >
> > So we should try to avoid overwriting existing files here. (I would guess
> > that tools like rsync and incremental backusp also like that we don't change
> > the date of these files)
> >
> That's not correct. Windows API function MoveFileEx has option to
> overwrite destination file [1]. apr_file_rename() uses MoveFileEx with
> MOVEFILE_REPLACE_EXISTING flag, so it should replace existing file.

The text above talks about the case that another application has the file open.

	Bert


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