The MAC_Binding table in the SB database may grow indefinitely (due
to a lack of an aging mechanism of its entries) and eventually
lead to OOM killers for neutron-server which maintains an in-memory
copy of the database.
In order to stop monitoring this table, this patch is invoking
the ovsdb-client tool to remove the entries associated to
Floating IPs that have just been detached. The execution of this
tool is really fast as it will just invoke a JSON-RPC transact command
which doesn't require downloading the database contents.
In a scale test, the memory consumption of neutron-server dropped
from 75GB to 7GB with this patch.
Closes-Bug: #1946318
Conflicts:
neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py
neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py
neutron/tests/unit/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py
Note: The functional test has been changed for this stable branch
because the update_tables() method from ovsdbapp is not availabie for
this version of Neutron. So I changed the functional test to add the
MAC_Binding entry via ovsdb-client instead of using ovsdbapp to do so.
Signed-off-by: Daniel Alvarez Sanchez <dalvarez@redhat.com>
Change-Id: Id84bf17953527c415d611bfc198038fb6f811de3
(cherry picked from commit f6c3552769)
b767825d13