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From Les Mikesell <>
Subject Re: Support for filesystem snapshots (?)
Date Tue, 03 Aug 2010 13:08:50 GMT
Nico Kadel-Garcia wrote:
> On Tue, Aug 3, 2010 at 6:56 AM, Stefan Sperling <> wrote:
>> On Tue, Aug 03, 2010 at 10:33:28AM +0000, Florian Weimer wrote:
>>> Kernel-level buffers are taken into account.  Application buffers
>>> aren't, the application has to take care of that.  But if the
>>> Subversion fails to do that, it cannot recover from file system
>>> crashes, either, which is arguably a bug in Subversion.
>> Subversion carefully flushes file buffers after writing revision files.
> And that's why the time to take the snapshot is in the post-commit step.

Does each post-commit step complete atomically before any other commit can 
start?  And by flush, does that mean to the system buffers or an fsync() to disk 
(on systems where fsync actually works)?

   Les Mikesell

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