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Re: [RFC] FSFS filesystem options (long, sorry)

From: Greg Hudson <ghudson_at_MIT.EDU>
Date: 2007-03-06 00:04:40 CET

On Mon, 2007-03-05 at 14:50 -0800, Karl Fogel wrote:
> Remember that it's okay to have multiple representations of the same
> historical data present at the same time -- readers don't care which
> source is behind the data they're getting...
> ...so upgrading the format can happen whenever you're ready to make
> new connections from older clients return errors.

You're still stuck thinking about the standard network server
architecture, with only one piece of back-end code on one machine
accessing the disk representation of a repository. That's the
recommended setup, but it's not the only one. In that setup, there's no
issue upgrading the format of a repository; it doesn't induce any
incompatibilities with the clients.

We're talking about the case where the disk representation of a
repository is being shared over a network filesystem to multiple
machines, each using potentially different back-end code to access the
repository. That's a more difficult case, and we can't use the network
layer abstraction barriers to pull the wool over anyone's eyes.

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Received on Tue Mar 6 00:04:08 2007

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