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Posted to dev@subversion.apache.org by "D.J. Heap" <dj...@shadyvale.net> on 2003/06/07 23:45:26 UTC
Windows 'Access Denied' Update
Just a quick FYI for any who care...
On a fresh XP machine with Index Server off and no AV stuff installed,
I've been multi-stress.pl-ing and get the 'Access denied' problem on
FAT32 as well as NTFS. *And* if I patch svn_io_file_rename to attempt
100 retries, it seems to fix the rename, but then I occasionally see
svn_io_file_remove failures with 'Access Denied.'
It does take multiple stress.pl's and usually several hundred revisions
at least.
I also converted my test-repro program to use APR thinking maybe it's
use of overlapped i/o might have something to do with it...but alas, no
luck. So I'm still missing something that Subversion is doing to
trigger the problem, I guess.
Anyway, it's not just NTFS and it's not just renames. Yay, fun.
BTW, these are the only failures I'm seeing anymore with BDB 4.0 --
thanks to all the recent fixes I haven't had a single case of the
deadlock problem, or the 'unable to open environment' problem. (BDB 4.1
has been behaving much better than it was, also, but performance is
still poorer and it often hangs -- all processes get hung up, even
db_archive and I have to kill them all off and recover the db. I'll get
a stack trace tonight or tomorrow and post it.)
DJ
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RE: Windows 'Access Denied' Update
Posted by "D.J. Heap" <dj...@dhiprovo.com>.
Most of the time, but not all the time. The only way I've made it work
well on all the machines I've tried it on is to put it into a sleep(1)
and retry loop of at *least* 20 or so attempts. Anything less and it
still fails on some machines. That implies it is very dependent on
machine speed or something, which means sleep times/retry times are just
guessing games at best.
If I could just get it recreated outside of Subversion and prove it's a
Microsoft problem...although it probably still wouldn't get fixed for
months at least.
DJ
-----Original Message-----
From: John Peacock [mailto:jpeacock@rowman.com]
Sent: Monday, June 09, 2003 12:47 PM
To: D.J. Heap
Cc: 'Subversion Dev'
Subject: Re: Windows 'Access Denied' Update
D.J. Heap wrote:
> Thanks, I would be very interested in hearing how they managed a
> reliable workaround.
sleep(1) would work, I suppose. ;~)
John
--
John Peacock
Director of Information Research and Technology
Rowman & Littlefield Publishing Group
4501 Forbes Boulevard
Suite H
Lanham, MD 20706
301-459-3366 x.5010
fax 301-429-5748
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Re: Windows 'Access Denied' Update
Posted by John Peacock <jp...@rowman.com>.
D.J. Heap wrote:
> Thanks, I would be very interested in hearing how they managed a
> reliable workaround.
sleep(1) would work, I suppose. ;~)
John
--
John Peacock
Director of Information Research and Technology
Rowman & Littlefield Publishing Group
4501 Forbes Boulevard
Suite H
Lanham, MD 20706
301-459-3366 x.5010
fax 301-429-5748
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RE: Windows 'Access Denied' Update
Posted by "D.J. Heap" <dj...@dhiprovo.com>.
Thanks, I would be very interested in hearing how they managed a
reliable workaround.
DJ
-----Original Message-----
From: John Peacock [mailto:jpeacock@rowman.com]
Sent: Monday, June 09, 2003 12:38 PM
To: D.J. Heap
Cc: Subversion Dev
Subject: Re: Windows 'Access Denied' Update
D.J. Heap wrote:
> On a fresh XP machine with Index Server off and no AV stuff installed,
> I've been multi-stress.pl-ing and get the 'Access denied' problem on
> FAT32 as well as NTFS. *And* if I patch svn_io_file_rename to attempt
> 100 retries, it seems to fix the rename, but then I occasionally see
> svn_io_file_remove failures with 'Access Denied.'
>
<snip>
>
> Anyway, it's not just NTFS and it's not just renames. Yay, fun.
I believe the same problem was mentioned on the CVSNT list a while back,
and the
lead developer's belief was that the NT filesystem architecture was
introducing
lags, i.e. renaming/deleting the file was not strictly atomic with the
filesystem actually updated to reflect the delete. I don't remember if
this was
just NTFS or also on FAT32.
I'll ask on that list for what he remembers (and what he did to work
around it).
John
--
John Peacock
Director of Information Research and Technology
Rowman & Littlefield Publishing Group
4501 Forbes Boulevard
Suite H
Lanham, MD 20706
301-459-3366 x.5010
fax 301-429-5748
**********************************************************************
This email and any files transmitted with it are confidential
and intended solely for the use of the individual or entity to
whom they are addressed. If you have received this email
in error please notify the system manager.
This footnote also confirms that this email message has been
swept by MIMEsweeper for the presence of computer viruses.
www.mimesweeper.com
**********************************************************************
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Re: Windows 'Access Denied' Update
Posted by John Peacock <jp...@rowman.com>.
D.J. Heap wrote:
> On a fresh XP machine with Index Server off and no AV stuff installed,
> I've been multi-stress.pl-ing and get the 'Access denied' problem on
> FAT32 as well as NTFS. *And* if I patch svn_io_file_rename to attempt
> 100 retries, it seems to fix the rename, but then I occasionally see
> svn_io_file_remove failures with 'Access Denied.'
>
<snip>
>
> Anyway, it's not just NTFS and it's not just renames. Yay, fun.
I believe the same problem was mentioned on the CVSNT list a while back, and the
lead developer's belief was that the NT filesystem architecture was introducing
lags, i.e. renaming/deleting the file was not strictly atomic with the
filesystem actually updated to reflect the delete. I don't remember if this was
just NTFS or also on FAT32.
I'll ask on that list for what he remembers (and what he did to work around it).
John
--
John Peacock
Director of Information Research and Technology
Rowman & Littlefield Publishing Group
4501 Forbes Boulevard
Suite H
Lanham, MD 20706
301-459-3366 x.5010
fax 301-429-5748
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