2.0 upgrade experiences

[Robert Collins]

On Thu, 2009-08-13 at 16:26 +1000, Andrew Cowie wrote:
> On Thu, 2009-08-13 at 15:53 +1000, Robert Collins wrote:
> > See under 'userspace file system barriers'...
> 
> So (modulo the different-filesystem-forcing-I/O-on-move
> -instead-of-just-poking-the-inode thing),
> 
> Could we not write the backup.bzr and obsolete_packs and whatever else
> off to /tmp? Then it wouldn't show up in `du -sm .`

It would however disappear when the system is rebooted in /tmp
regardless of whether the important data did land on disk - precisely
the problem we're trying to avoid.

> Or, hey, shit, even ~/.bazaar

This one could cause cross-filesystem copies - a lot of work compared to
the simple rename we're expecting with the current design. It also can't
be garbage collected by other bzr processes writing data, so its more
likely to accrue cruft.

-Rob
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