Re: File Locking on Win9x, and FSFS repositories

On Fri, 2005-08-19 at 09:47 +0100, Max Bowsher wrote:
> Something has just occurred to me. Without any repository wide shared lock,
> we have no way of locking a repository for mandatory single-threaded
> operations.... such as recovery (bdb only) AND in-place format upgrade
> (*applies to FSFS too*)!

It is my belief that readers of an FSFS repository should not do any
locking and should require nothing more than read access, and we should
design around that constraint.

If that means automatic in-place format upgrades are very difficult, I
don't think we should compromise the principle. I don't think we should
be making changes in the 1.x line which require in-place format upgrades
anyway. (What if an automated upgrade is interrupted halfway through?
A borked working copy is one thing; a borked repository is
catastrophic.)

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Received on Sat Aug 20 18:09:15 2005