Succeed message for Resize Instance is confusing (resize is async operation)

[Cindy Lu]

If I try to size up a flavor (m1.xlarge), it gives me the message "Success: Preparing instance "____" for resize" - but nothing happens.

Please see the attached image.

The top image shows a successful resize. The second shows the successful message, but no behavior.

[Julie Pichon (jpichon)]

It seems like Resize is an asynchronous function and that is why we don't get a result immediately (and I'm guessing we try to indicate so by saying "Preparing" rather than "Resized successfully" or something like that). All we can confirm is that we sent the request to Nova.

REQ: curl -i 'http://192.168.100.177:8774/v2/42365c9f445a46e791e62d9093c113ad/servers/53f67c2d-4724-419b-896c-0ddb1a9d6525/action' -X POST -H "X-Auth-Project-Id: 42365c9f445a46e791e62d9093c113ad" -H "User-Agent: python-novaclient" -H "Content-Type: application/json" -H "Accept: application/json" -H "X-Auth-Token: 83edcf42258c48c7119ba8b1b584d63e" -d '{"resize": {"flavorRef": "5"}}'
RESP: [202] CaseInsensitiveDict({'date': 'Fri, 07 Feb 2014 16:51:36 GMT', 'content-length': '0', 'content-type': 'text/html; charset=UTF-8', 'x-compute-request-id': 'req-0d62ed35-8108-40ef-84e8-96d51760b6ab'})

The behaviour for Nova client is similar if I try to resize to a flavour too large for my VM:

$ nova resize 53f67c2d-4724-419b-896c-0ddb1a9d6525 5
$

In the nova-conductor logs:

WARNING nova.scheduler.utils [req-9a544a50-2bf4-4c58-aafa-a1b3b57b11d4 demo demo] Failed to compute_task_migrate_server: No valid host was found.

I don't see a way for Horizon to surface the error, or perhaps there is a message we can consume once the real time communication blueprint is implemented? ( https://blueprints.launchpad.net/horizon/+spec/realtime-communication ) Instance actions list the request ids but not the results either, as far as I can tell.

[Julie Pichon (jpichon)]

Perhaps for now, similar to Migration we could change the message to say "Scheduled resize" rather than "Preparing".

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/79679

[Julie Pichon (jpichon)]

Further improvements for asynchronous actions can probably be handled as part of bug 1286418.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/79679
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=98bd28fb78e1d735944a65d78e14e84f6cdfd7b2
Submitter: Jenkins
Branch: master

commit 98bd28fb78e1d735944a65d78e14e84f6cdfd7b2
Author: Ana Malagon <email address hidden>
Date: Thu Mar 13 07:02:07 2014 -0400

    Clarified success message for instance resize

    Resize is an asynchronous action; the success
    message can only confirm that the request for
    resize was accepted by the nova API service
    and that a corresponding RPC message was sent
    to the nova scheduler service.

    Closes-Bug: #1277257
    Change-Id: I125c79c4c76fcb27f1e0d3c7122125e9036b1008