Open Stack

So there is a series of patches starting with - 
https://review.openstack.org/#/c/53417/ that go back and radically 
change existing migration files.

This is really a no-no, unless there is a critical bug fix that 
absolutely requires it. Changing past migrations should be considered 
with the same level of weight as an N-2 backport, only done when there 
is huge upside to the change.

I've -2ed the first 2 patches in the series, though that review applies 
to all of them (I figured a mailing list thread was probably more useful 
than -2ing everything in the series).

There needs to be really solid discussion about the trade offs here 
before contemplating something as dangerous as this.

	-Sean

-- 
Sean Dague
http://dague.net