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[Lucas Alvares Gomes <lucasagomes@xxxxxxxxx>]

Public bug reported:

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

** Affects: neutron
     Importance: High
     Assignee: Lucas Alvares Gomes (lucasagomes)
         Status: In Progress


** Tags: ovn

** Changed in: neutron
   Importance: Undecided => High

** Changed in: neutron
     Assignee: (unassigned) => Lucas Alvares Gomes (lucasagomes)

** Tags added: ovn

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https://bugs.launchpad.net/bugs/1862648

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

Status in neutron:
  In Progress

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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