Compute API version defaults to '2.1' not '2.latest'

Bug #1677372 reported by Dean Troyer on 2017-03-29
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
python-openstackclient
New
Undecided
Unassigned

Bug Description

We attempted to set the default Compute API to 2.latest but that change did not work. OSC's default Compute API is set to '2.1' intentionally to maintain backward-compatibility. This strategy will have to change if/when the minimum Compute API version is ever raised. But we are also missing out on some things, so how can we do this?

Setting OS_COMPUTE_API_VERSION=2 has always been valid, and in fact is the default in clouds.yaml (os-client-config) when OSC does not override it. This is usually interpreted to mean '2.0', which is no longer a valid version, and in fact was never accepted by OSC (only '2' was valid before microversions were introduced).

The proposal is to interpret '2' now as novaclient.API_MAX_VERSION (At this writing it is 2.41). This would cause changes in behavior for anyone explicitly setting OS_COMPUTE_API_VERSION=2.

One question is should this change wait for OSC 4.0 as it does change behaviour? I think it should, but want to get some feedback from users.

Rui Chen (kiwik-chenrui) wrote :

In most use cases it should be ok when we interpret '2' as novaclient.API_MAX_VERSION, because novaclient api microversion match with nova service microversion.

But if we use high version client(Pike) to talk with low version service(Mitaka), it might not work, when novaclient.API_MAX_VERSION is out of the range that nova service supported, and nova service return HTTP406 to refuse the request. So I think we should do api version discovery and take min(client.microversion, service.microversion) to init novaclient.

I prefer to wait for osc 4.0 to land the change, we don't know exactly which commands will break[1]. I have an idea, we should to add non-voting jenkins job to run functional tests with --os-compute-api-version 2.latest, help us to find the gap.

[1]: https://github.com/openstack/python-openstackclient/blob/master/openstackclient/compute/v2/console.py#L134-L138

To post a comment you must log in.
This report contains Public information  Edit
Everyone can see this information.

Other bug subscribers