[ovs-discuss] [OVN] no response to inactivity probe

[Tony Liu]

In my deployment, on each Neutron server, there are 13 Neutron server processes.
I see 12 of them (monitor, maintenance, RPC, API) connect to both ovn-nb-db
and ovn-sb-db. With 3 Neutron server nodes, that's 36 OVSDB clients.
Is so many clients OK?

Any suggestions how to figure out which side doesn't respond the probe,
if it's bi-directional? I don't see any activities from logging, other than
connect/drop and reconnect...

BTW, please let me know if this is not the right place to discuss Neutron OVN
ML2 driver.


Thanks!

Tony

> -----Original Message-----
> From: dev <ovs-dev-bounces at openvswitch.org> On Behalf Of Tony Liu
> Sent: Monday, August 3, 2020 7:45 PM
> To: ovs-discuss <ovs-discuss at openvswitch.org>; ovs-dev <ovs-
> dev at openvswitch.org>
> Subject: [ovs-dev] [OVN] no response to inactivity probe
> 
> Hi,
> 
> Neutron OVN ML2 driver was disconnected by ovn-nb-db. There are many
> error messages from ovn-nb-db leader.
> ========
> 2020-08-04T02:31:39.751Z|03138|reconnect|ERR|tcp:10.6.20.81:58620: no
> response to inactivity probe after 5 seconds, disconnecting
> 2020-08-04T02:31:42.484Z|03139|reconnect|ERR|tcp:10.6.20.81:58300: no
> response to inactivity probe after 5 seconds, disconnecting
> 2020-08-04T02:31:49.858Z|03140|reconnect|ERR|tcp:10.6.20.81:59582: no
> response to inactivity probe after 5 seconds, disconnecting
> 2020-08-04T02:31:53.057Z|03141|reconnect|ERR|tcp:10.6.20.83:42626: no
> response to inactivity probe after 5 seconds, disconnecting
> 2020-08-04T02:31:53.058Z|03142|reconnect|ERR|tcp:10.6.20.82:45412: no
> response to inactivity probe after 5 seconds, disconnecting
> 2020-08-04T02:31:54.067Z|03143|reconnect|ERR|tcp:10.6.20.81:59416: no
> response to inactivity probe after 5 seconds, disconnecting
> 2020-08-04T02:31:54.809Z|03144|reconnect|ERR|tcp:10.6.20.81:60004: no
> response to inactivity probe after 5 seconds, disconnecting ========
> 
> Could anyone share a bit details how this inactivity probe works?
> From OVN ML2 driver log, I see it connected to the leader, then the
> connection was closed by leader after 5 or 6 seconds. Is this probe one-
> way or two-ways?
> Both sides are not busy, not taking much CPU cycles. Not sure how this
> could happen. Any thoughts?
> 
> 
> Thanks!
> 
> Tony
> 
> 
> 
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