[openstack-dev] [Nova] Migration state machine proposal.

Zhenyu Zheng zhengzhenyulixi at gmail.com
Wed Oct 14 03:14:16 UTC 2015

I think it will be better if you can submit a spec for your proposal, it
will be easier for people to give comment.

On Wed, Oct 14, 2015 at 10:05 AM, Tang Chen <tangchen at cn.fujitsu.com> wrote:

> Hi, all,
> Please help to review this BP.
> https://blueprints.launchpad.net/nova/+spec/live-migration-state-machine
> Currently, the migration_status field in Migration object is indicating
> the
> status of migration process. But in the current code, it is represented
> by pure string, like 'migrating', 'finished', and so on.
> The strings could be confusing to different developers, e.g. there are 3
> statuses representing the migration process is over successfully:
> 'finished', 'completed' and 'done'.
> And 2 for migration in process: 'running' and 'migrating'.
> So I think we should use constants or enum for these statuses.
> Furthermore, Nikola has proposed to create a state machine for the
> statuses,
> which is part of another abandoned BP. And this is also the work I'd like
> to go
> on with. Please refer to:
> https://review.openstack.org/#/c/197668/
> https://review.openstack.org/#/c/197669/
> Another proposal is: introduce a new member named "state" into Migration.
> Use a state machine to handle this Migration.state, and leave
> migration_status
> field a descriptive human readable free-form.
> So how do you think ?
> Thanks.
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