re-added support for ghosts in newformat

[Robert Collins]

On Tue, 2005-10-04 at 14:09 -0500, John A Meinel wrote:

> Since the new format prefers an uncompressed revision store, and the
> Compressed format is the old format, how about we update
> "CompressedTextStore" to handle both compressed and uncompressed (so we
> can read the old format), and then we leave the new format as using
> TextStore for now, which means that it doesn't need to do the round-trip
> stuff.

Another way to do it would be to make the default format that the branch
wants paramterisable.

i.e. TextStore(transport, compressed_is_default=True)

=> tries .gz first then without.

TextStore(transport, compressed_is_default=False)

=> tries without .gz, then with.

For a homogenous store, with the right default, this will be optimal.
For a heterogenous store, or one with the wrong default, you'll pay the
probe cost.. but bringing in some async stuff will mean you are only
paying the request cost, not the latency cost, for many operations.

Rob

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