[MERGE] Notes on a customized chk+gc index

[Robert Collins]

On Fri, 2009-03-20 at 21:58 -0500, John Arbash Meinel wrote:
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> I was thinking about how our current indexes scale (approx 38 bytes per
> record after compression), and what it would take to get a better index
> for a chk+groupcompress index. The naive fixed-width form takes 40-bytes
> per record (20-byte sha, 8-byte start of group, 4-byte group len, 4-byte
> in-group start, 4-byte in-group end/len).

I will read this in detail on Monday, I agree that we can and should try
to get this in.

As its a really orthogonal change, I'd consider doing this as a rev to
the beta format [5->6] rather than delaying landing the beta.

-Rob
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