Public bug reported: Originally reported at [0] and fixed in OVN 21.06 by [1].
If some OF rules needs to be replaced due to logical flow changes, ovn-controller deletes old rules first and adds new ones later. In a complex scenario with big number of flows a lot of time can pass between these events leading to the dataplane downtime and packet loss. Also, while these changes are in progress, OVS will use incomplete pipelines that will also lead to packet drops. To avoid this, all flow modifications should be done atomically, so there will be always some version of OF rules installed that can handle dataplane traffic and it will be complete in terms of reflecting some consistent set of logical flows. Wrapping all flow modifications into atomic ordered bundle to achieve that. 0: https://bugzilla.redhat.com/1947398 1: https://github.com/ovn-org/ovn/commit/7687d878f1e30c98d52b37bade42293f2a1e9bd3 ** Affects: cloud-archive Importance: Undecided Status: New ** Affects: cloud-archive/wallaby Importance: Undecided Status: New ** Affects: ovn (Ubuntu) Importance: Undecided Status: Fix Released ** Affects: ovn (Ubuntu Focal) Importance: Undecided Status: New ** Also affects: ovn (Ubuntu Focal) Importance: Undecided Status: New ** Changed in: ovn (Ubuntu) Status: New => Fix Released ** Also affects: cloud-archive Importance: Undecided Status: New ** Also affects: cloud-archive/wallaby Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1964348 Title: [20.03][20.12] ovn-controller should update OF rules atomically To manage notifications about this bug go to: https://bugs.launchpad.net/cloud-archive/+bug/1964348/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
