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Polling should be fine. get_port operations a relatively cheap operation
for Neutron.

Maybe for the future we can have a more pluggable version of the nova
callback notifier we have in Neutron like Salvatore pointed out.

On Fri, Jun 10, 2016 at 7:49 AM, Mohammad Banikazemi <mb at us.ibm.com> wrote:

> Hi Neil,
>
> Currently, when a docker libnetwork "join" operation in Kuryr is returned,
> it is not guaranteed that the network connectivity has been established.
> There are containers that check for network connectivity as the first thing
> they do when they come up and under heavy load some notice there is no
> connectivity and simply bail out. I am trying to deal with such a use case,
>
> Thanks for pointing out that option 2 won't work for you. I think
> Salvatore also alluded to that in his response. What you are suggesting
> with pinging the container from the appropriate namespace may be worth a
> try but then there may be containers that do not allow ingress traffic
> while they are up and happy. So short of what Salvatore suggested in his
> earlier email (and I am not sure if that can be done without additions to
> Neutron), we are left with option 1.
>
> Keep in mind that users can choose not to enable the blocking option and
> things will be as they are right now. Would that be reasonable?
>
> Best,
>
> Mohammad
>
> [image: Inactive hide details for Neil Jerram ---06/10/2016 09:25:59
> AM---Hi Mohammad, Why is the blocking needed? Is it to report som]Neil
> Jerram ---06/10/2016 09:25:59 AM---Hi Mohammad, Why is the blocking needed?
> Is it to report some kind of status back to
>
> From: Neil Jerram <neil at tigera.io>
> To: "OpenStack Development Mailing List (not for usage questions)" <
> openstack-dev at lists.openstack.org>
> Date: 06/10/2016 09:25 AM
> Subject: Re: [openstack-dev] [Kuryr] [Neutron] Waiting until Neutron Port
> is Active
> ------------------------------
>
>
>
> Hi Mohammad,
>
> Why is the blocking needed?  Is it to report some kind of status back to
> Docker/Kubernetes, or to allow some follow-on action to happen?
>
> When using networking-calico as the driver, I think that only option (1)
> would work, out of the options you've suggested below.  (3) doesn't work,
> as you say, because Calico doesn't involve an L2 agent.  Also Calico
> doesn't use the RPC message queue for reporting port status, because we've
> found that that message queue is in itself a scalability bottleneck.
>
> I guess another option would be for the using system to determine for
> itself when the port appears to be working, e.g. by the host pinging the
> container/pod's IP address.
>
> Regards,
>     Neil
>
>
> On Wed, Jun 8, 2016 at 4:23 PM Mohammad Banikazemi <*mb at us.ibm.com*
> <mb at us.ibm.com>> wrote:
>
>    For the Kuryr project, in order to support blocking until vifs are
>    plugged in (that is adding config options similar to the following options
>    define in Nova: vif_plugging_is_fatal and vif_plugging_timeout), we need to
>    detect that the Neutron plugin being used is done with plugging a given vif.
>
>    Here are a few options:
>
>    1- The simplest approach seems to be polling for the status of the
>    Neutron port to become Active. (This may lead to scalability issues but
>    short of having a specific goal for scalability, it is not clear that will
>    be the case.)
>    2- Alternatively, We could subscribe to the message queue and wait for
>    such a port update event.
>    3- It was also suggested that we could use l2 agent extension to
>    detect such an event but that seems to limit us to certain Neutron plugins
>    and therefore not acceptable.
>
>    I was wondering if there are other and better options.
>
>    Best,
>
>    Mohammad
>
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