Hi Jake,
Thanks for raising this topic. I'm really interested in it. I reviewed
most of the locations patches of Glance, so drop my 2 cents about this.
So firstly, I think it's a valid user case. As for the implementation, I
think a spec-lite is enough, given it's just a driver for current
location strategy. I haven't seen your code, so I'm not sure if your
implementation is ok for upstreaming. But I would assume your code is a
driver under
https://github.com/openstack/glance/tree/master/glance/common/location_strategy
and personally, I think the metadata of location is right way since the
location URL can't provide clear and enough information for the ranking.
We can discuss more on #openstack-glance channel. Cheers.
On 14/01/16 13:07, Jake Yip wrote:
Hi all,
I've recently ran across a constraint in glance-api while working with
image locations. In essence, there is no way to customize ordering of
image-locations other than the default location strategies, namely
location_order and store_type [0]. It seems like a more generic method
of ordering image locations is needed, IMHO.
Some background - We are in a multi-cell environment and each cell has
it's own glance-api server. All images are stored in a global swift
cluster. We would like glance to be able to fetch images from a local
store, so that we can do COW for backends like RBD.
Unfortunately, none of the current location strategies works for us,
as we might have multiple cells sharing the same backend. I've opened
a bug / wishlist describing this issue [1]. I have also implemented
code that allows us to achieve that based on image location metadata.
I am wondering anyone else have solved this before? I would like to
hear your opinions on how we can achieve this, and whether ranking it
by metadata is the way to go.
The current wishlist is now tracked as a spec-lite. Is this ok?
Regards,
Jake
[0]
http://docs.openstack.org/liberty/config-reference/content/section_glance-api.conf.html
[1] https://bugs.launchpad.net/glance/+bug/1528453
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