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[OpenStack Infra <1862648@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/706499
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=b85c273639f30cbffd95bfb92564adc8fb586465
Submitter: Zuul
Branch:    master

commit b85c273639f30cbffd95bfb92564adc8fb586465
Author: Lucas Alvares Gomes <lucasagomes@xxxxxxxxx>
Date:   Thu Feb 6 13:28:34 2020 +0000

    [OVN] Reduce the number of watched tables in MetadataProxyHandler
    
    This patch changes the SB IDL from the MetadataProxyHandler class to
    only watch the two required tables for it to function.
    
    The more tables it monitors, the bigger the burden is on the OVSDB to
    keep all the in-memory replicas updated. In special, the Chassis table
    can generate a lot of events due to the agents health check mechanism
    in the OVN driver so, removing it will prevent many events from being
    sent across the fabric.
    
    Closes-Bug: #1862648
    Change-Id: Ib4fb9b445ed7fe4bce7bc05ae1b8dca264324718
    Signed-off-by: Lucas Alvares Gomes <lucasagomes@xxxxxxxxx>


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

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Title:
  [OVN] Reduce the number of tables watched by MetadataProxyHandler

Status in neutron:
  Fix Released

Bug description:
  Currently the MetadataProxyHandler is monitoring more tables than it's
  required to [0][1]. Analyzing the code, only the Port_Bindings and
  Datapath_Bindings table would be necessary.

  The more tables it monitors, the bigger the burden is on OVSDB to keep
  all the in-memory replicas updated. In special, the Chassis table can
  generate a lot of events due to the agents health check mechanism in
  the OVN driver so, not monitoring it could prevent a lot of events
  from being set across the fabric.

  [0] https://github.com/openstack/neutron/blob/6709cfcdfaf29a696cd83da23d1a30d6d0ae8045/neutron/agent/ovn/metadata/server.py#L59
  [1] https://github.com/openstack/neutron/blob/6709cfcdfaf29a696cd83da23d1a30d6d0ae8045/neutron/agent/ovn/metadata/ovsdb.py#L34-L35

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