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Re: Support for filesystem snapshots (?)

From: Les Mikesell <lesmikesell_at_gmail.com>
Date: Mon, 02 Aug 2010 12:16:47 -0500

On 8/2/2010 11:42 AM, Vallon, Justin wrote:
> I did see that discussion, but it seems to contradict with the claim that the database operations are transactional.
> So, my follow up is: If I unplug the network cable between svn-commiter and filesystem, will the repository be corrupt?
> If yes, then the underlying database is not atomic and therefore not transactional.
> If no, then the server can take a snapshot at any point in time, and the snapshot is guaranteed to be consistent.

That's not a good match for the operations at least in server-mode
operations since the server can notice the disconnect and back out
failed transactions. And even with file-mapped connections, the
committing client should know that the commit did not complete.

A better match for comparison would be what happens if the server
crashes mid-transaction. A backup taken with the server active might
catch the same state. So the more relevant question would be if the
repository will always be consistent after a server crash.

   Les Mikesell
Received on 2010-08-02 19:17:29 CEST

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