Open Stack

Agree.  Why not both.  and will use created_at to work out how long the
migration has been
running.


Paul, thank you very much for the suggestion.

BR.
Shaohe Feng



2015-11-26 19:10 GMT+08:00 Paul Carlton <paul.carlton2 at hpe.com>:

> On 26/11/15 10:48, 少合冯 wrote:
>
> Now, we are agree on getting more migration status details info are
> useful.
>
> But How do we get them?
> By REST API or Notification?
>
>
> IF by API, does the  "time_elapsed" is needed?
> For there is a "created_at" field.
> But IMO, it is base on the time of the conductor server?
> The time_elapsed can get from libvirt, which from the hypervisor.
> Usually, there are ntp-server in the cloud. and we can get the
> time_elapsed by "created_at".
> but not sure there will be the case:
> the time of hypervisor and conductor server host are out of sync?
>
> Why not both.  Just update the _monitor_live_migration method in the
> libvirt
>  driver (and any similar functions in other drivers if they exist) so it
> updates
>  the migration object and also sends notification events.  These don't have
>  to be at 5 second intervals, although I think that is about right for the
> migration object update.  Notification messages could be once event 30
>  seconds or so.
>
> Operators can monitor the progress via the API and orchestration utilities
>  to consume the notification messages (and/or use API).
> This will enable them to identify migration operations that are not making
>  good progress and take actions to address the issue.
>
> The created_at and updated_at fields of the migration object should be
> sufficient to allow the caller to work out how long the migration has been
> running for (or how long it took in the case of a completed migration).
>
> Notification payload can include the created_at field or not.  I'd say not.
> There will be a notification message generated when a migration starts
> so subsequent progress messages don't need it, if the consumer wants
> the complete picture they can call the API.
>
>
> --
> Paul Carlton
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> Cloud Services
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