[neutron] - OVN heartbead - short agent_down_time

Ihar Hrachyshka ihrachys at redhat.com
Wed Jun 21 21:00:16 UTC 2023


On Mon, Jun 19, 2023 at 11:04 AM Roberto Bartzen Acosta <
roberto.acosta at luizalabs.com> wrote:

> Hello Neutron folks,
>
> We discussed in the Operators feedback session about OVN heartbeat and the
> use of "infinity" values for large-scale deployments because we have a
> significant infrastructure impact when a short 'agent_down_time' is
> configured.
>

This is tangentially related, but note that using "infinity" values for
agent_down_time is unsafe:
https://bugzilla.redhat.com/show_bug.cgi?id=2215407 (depending on whether
your "infinity" value is larger than ~15 days, assuming 32 bit ints used on
your platform).


>
>
> The merged patch [1] limited the maximum delay to 10 seconds. I understand
> the requirement to use random values to avoid load spikes, but why does
> this fix limit the heartbeat to 10 seconds? What is the goal of the
> agent_down_time parameter in this case? How will it work for someone who
> has hundreds of compute nodes / metadata agents?
>
> Regards,
> Roberto
>
> [1] - https://review.opendev.org/c/openstack/neutron/+/883687
>
>
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