[openstack-dev] [nova][newton] Austin summit nova/newton cross-project session recap

Carl Baldwin carl at ecbaldwin.net
Wed May 11 16:00:31 UTC 2016

On Sun, May 1, 2016 at 7:01 PM, Matt Riedemann
<mriedem at linux.vnet.ibm.com> wrote:
> On Wednesday morning the Nova and Neutron teams got together for a design
> summit session. The full etherpad is here [1].
> We talked through three major items.
> 1. Neutron routed networks.
> Carl Baldwin gave a quick recap that we're on track with the Nova spec [2]
> and had pushed a new revision which addressed Dan Smith's latest comments.
> The spec is highly dependent on Jay Pipes' generic-resource-pools spec which
> needs to be rebated, and then hopefully we can approve that this week and
> the routed networks one shortly thereafter.
> We spent some time with Dan Smith sketching out his idea for moving the
> neutron network allocation code from the nova compute node to conductor.
> This would help with a few things:
> a) Doing the allocation earlier in the process so it's less expensive if we
> fail on the compute and get into a retry loop.
> b) It should clean up a bunch of the allocation code that's in the network
> API today, so we can separate the allocation logic from the check/update
> logic. This would mean that by the time we get to the compute the ports are
> already allocated and we just have to check back with Neutron that they are
> still correct and update their details. And that would also mean by the time
> we get to the compute it looks the same whether the user provided the port
> at boot time or Nova allocated it.
> c) Nova can update it's allocation tables before scheduling to make a more
> informed decision about where to place the instance based on what Neutron
> has already told us is available.
> John Garbutt is planning on working on doing this cleanup/refactor to move
> parts of the network allocation code from the compute to conductor. We'll
> most likely need a spec for this work.


This is a good summary from my point of view.  I just want to say it
was a pleasure to be there.  I thought it was very productive for both


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