Scoping the UI changes for 2.0

[Robert Collins]

On Tue, 2009-04-28 at 10:19 -0400, Karl Fogel wrote:

> But because Bazaar's storage format is its wire format too, there is
> no
> intermediary protocol providing an opportunity for compatibility
> shims,
> and for graceful degradation of performance and even functionality.
> Instead, if both sides don't support the same format, it's game over.

We are heading in this direction with the HPSS work we've been putting
in. Its not something we can just flick a switch to get though, not
without disabling e.g. 'log' over the network. Today we still require
that both ends understand the disk format *because* many operations will
fall back to using the VFS, *and* because the flags that describe what
the storage layer is capable of have been such a moving target that
previous attempts to be totally decoupled have failed - we've had
repeated regressions in the use of the network layer because of this.
The current approach doesn't suffer from this.

-Rob
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