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[OpenStack Infra <1961967@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/830509
Committed: https://opendev.org/openstack/neutron/commit/b2421b01e5bc1269458b421643c13b620cdaccaf
Submitter: "Zuul (22348)"
Branch:    master

commit b2421b01e5bc1269458b421643c13b620cdaccaf
Author: Elvira García <egarciar@xxxxxxxxxx>
Date:   Tue Feb 22 18:56:55 2022 +0100

    [OVN] Handle RouterNotFound exception in set_gateway_mtu
    
    When handling multiple router update/delete petitions, if they are
    executed at the same time, there is a chance that the set_gateway_mtu
    tries to update a no-longer-existing router, triggering a
    RouterNotFound error from the _get_router_ports function. Now, if there
    is not a router, the _get_router_ports function will return an empty
    list instead of raising the error.
    
    Closes-Bug: #1961967
    Signed-off-by: Elvira García <egarciar@xxxxxxxxxx>
    Change-Id: Ic54214ca4965274cd58c1d3a278d8f3ffcda0a64


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1961967

Title:
  [OVN]  Neutron requests answered with RouterNotFound

Status in neutron:
  Fix Released

Bug description:
  A recently merged patch [0] has introduced a race condition when
  creating or updating an OVN Logical Router Port. If the mtu is changed
  on an external network, the set_gateway_mtu function will look to
  update all related logical router ports.

  There is a small chance in this operation that one of those routers
  got deleted along the way. This raises a RouterNotFound error and
  fails.

  More info and testing details available on this Bugzilla [1]

  [0] https://review.opendev.org/c/openstack/neutron/+/818443
  [1] https://bugzilla.redhat.com/show_bug.cgi?id=2055171

  Fix proposed: https://review.opendev.org/c/openstack/neutron/+/830509

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