[ovs-dev] [PATCH] ovn-northd: Add the option to pause and resume

Ben Pfaff blp at ovn.org
Fri Jul 5 21:29:52 UTC 2019

On Mon, Jun 17, 2019 at 11:10:04AM +0530, nusiddiq at redhat.com wrote:
> From: Numan Siddique <nusiddiq at redhat.com>
> This patch adds 3 unixctl socket comments - pause, resume and is-paused.
> Usage: ovs-appctl -t ovn-northd pause/resume/is-paused
> This feature will be useful if the CMS wants to
>   - deploy OVN DB servers in active/passive mode and
>   - run ovn-northd on all these nodes and use unix ctl sockets to
>     connect to the local OVN DB servers.
> On the nodes where OVN Db ovsdb-servers are in passive mode, the local ovn-northds
> will process the DB changes and calculate logical flows to be throw out later
> because write txns are not allowed by these ovsdb-servers. It results in
> unncessary CPU usage.
> With these commands, CMS can pause ovn-northd on these node. A node
> which becomes master, can resume the ovn-northd.
> This feature will be useful in ovn-kubernetes if the above deployment model
> is chosen.
> Signed-off-by: Numan Siddique <nusiddiq at redhat.com>

Thank you.  This seems like a helpful feature.

The commit message above explains the idea well at a high level, but the
documentation that it adds does not give the high level idea but only
the low level feature description.  This could make it hard for a system
administrator to understand why the low level feature is there.  I would
suggest sending a v2 that explains the high level idea in the
documentation as well as in the commit message.



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