Open Stack

Hi,

On Thu, 2013-01-31 at 14:30 -0800, Vishvananda Ishaya wrote:
> On Jan 31, 2013, at 12:17 PM, Stephen Gran <stephen.gran at guardian.co.uk> wrote:
> > 
> > 2) Create a new tags table containing references to the resource type
> > and ID.  This has the advantage that we won't need to make lots of API
> > calls to return all the resources with a given tag, but also feels
> > possibly over-denormalized (is that a word?).
> 
> This would be the fastest way to implement the feature, but I suspect we will end up
> with some pretty nasty querys to do filters by tags in this model.

The proof of concept patch for doing it this way is at
https://review.openstack.org/#/c/20412/ .   The queries aren't amazing,
but they're not that awful either.  It currently hardcodes 'instance',
but that's just a lookup table to fix.

This doesn't mean I disagree about the right way to do it - if you think
tags will serve a purpose in glance/quantum/etc beyond EC2 API
compatibility, then that's the right way to do it.  I'm just saying that
if it's not useful in it's own right, getting a cheap and cheerful EC2
API compatibility fix a different way doesn't introduce huge amounts of
awfulness.

Cheers,
-- 
Stephen Gran
Senior Systems Integrator - guardian.co.uk

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