Incremental Processing with ovn-controller, with Han Zhou from eBay

OVS Orbit

English - May 23, 2018 03:46 - 28 minutes - 13 MB - ★★★★★ - 1 rating
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Previous Episode: Toward Leaner, Faster ovn-northd, with Leonid Ryzhyk from VMware Research Group

Next Episode: Oko: Extending Open vSwitch with Stateful Filters, with Paul Chaignon from Orange Labs and Inria Nancy

Han Zhou is an architect working on highly scalable and reliable SDN
solutions for eBay's cloud infrastructure. He is an active contributor
in OpenStack and OVS/OVN. Before eBay, he has been working in networking
area for more than 10 years in Cisco and Nokia.

In OVN, the ovn-controller daemon runs on each hypervisor.
It obtains logical flows from the OVN southbound database, transforms
them into "physical flows," and pushes the physical flows into
ovs-vswitchd over an OpenFlow connection. In the current
implementation, whenever any of the tables in the OVN southbound database
changed, the daemon would fully recompute all of the physical flows to be
pushed into ovs-vswitchd. With a sufficiently large setup,
this is expensive. This talk is about Han's patches to make computation
in ovn-controller incremental, so that a small change in the
input causes only a small amount of computation.

Some of the talk is easier to follow if you view the slides (PDF).

Han was previously featured in OVS Orbit in episode
36, where he spoke about Baker, an approach used by eBay to combine
OVN with Kubernetes.

OVS Orbit is produced by Ben Pfaff. The
intro music in this episode is Drive,
featuring cdk and DarrylJ, copyright 2013, 2016 by Alex. The bumper
music is Yeah Ant
featuring Wired Ant and Javolenus, copyright 2013 by Speck. The outro
music is Space
Bazooka featuring Doxen Zsigmond, copyright 2013 by Kirkoid. All
content is licensed under a Creative Commons Attribution 3.0
Unported (CC BY 3.0) license.