On Wed, Aug 5, 2020 at 12:51 PM Winson Wang <[email protected]> wrote:
> Hello OVN Experts: > > With large scale ovn-k8s cluster, there are several conditions that would > make ovn-controller clients connect SB central from a balanced state to > an unbalanced state. > Is there an ongoing project to address this problem? > If not, I have one proposal not sure if it is doable. > Please share your thoughts. > > The issue: > > OVN SB RAFT 3 node cluster, at first all the ovn-controller clients will > connect all the 3 nodes in a balanced state. > > The following conditions will make the connections become unbalanced. > > - > > One RAFT node restart, all the ovn-controller clients to reconnect to > the two remaining cluster nodes. > > > - > > Ovn-k8s, after SB raft pods rolling upgrade, the last raft pod has no > client connections. > > > RAFT clients in an unbalanced state would trigger more stress to the raft > cluster, which makes the raft unstable under stress compared to a balanced > state. > The proposal solution: > > Ovn-controller adds next unix commands “reconnect” with argument of > preferred SB node IP. > > When unbalanced state happens, the UNIX command can trigger > ovn-controller reconnect > > To new SB raft node with fast sync which doesn’t trigger the whole DB > downloading process. > > Thanks Winson. The proposal sounds good to me. Will you implement it? Han > > -- > Winson > > -- > You received this message because you are subscribed to the Google Groups > "ovn-kubernetes" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/ovn-kubernetes/CAMu6iS--iOW0LxxtkOhJpRT49E-9bJVy0iXraC1LMDUWeu6kLA%40mail.gmail.com > <https://groups.google.com/d/msgid/ovn-kubernetes/CAMu6iS--iOW0LxxtkOhJpRT49E-9bJVy0iXraC1LMDUWeu6kLA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . >
_______________________________________________ discuss mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
