Thanks Ilya!
Em seg., 27 de mai. de 2024 às 10:28, Ilya Maximets <[email protected]>
escreveu:
> On 5/27/24 18:22, Roberto Bartzen Acosta via discuss wrote:
> > Hello everyone!
> >
> > I found an issue during testing with the OVN-IC daemon. I noticed that
> applications that interact with python-idl show an error when deleting
> datapath_binding when the table index changes.
> >
> > We can see the error in the logs below:
> >
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> [-] Datapath_Binding(uuid=UUID('498e66a2-70bc-4587-a66f-0433baf82f60'),
> tunnel_key=16711683, load_balancers=[], external_ids={}) not in list:
> ValueError:
> Datapath_Binding(uuid=UUID('498e66a2-70bc-4587-a66f-0433baf82f60'),
> tunnel_key=16711683, load_balancers=[], external_ids={}) not in list
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> Traceback (most recent call last):
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> File
> "/usr/lib/python3/dist-packages/ovsdbapp/backend/ovs_idl/connection.py",
> line 110, in run
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> self.idl.run()
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> File "/usr/lib/python3/dist-packages/ovs/db/idl.py", line 465, in run
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> self.__parse_update(msg.params[2], OVSDB_UPDATE3)
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> File "/usr/lib/python3/dist-packages/ovs/db/idl.py", line 924, in
> __parse_update
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> self.__do_parse_update(update, version, self.tables)
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> File "/usr/lib/python3/dist-packages/ovs/db/idl.py", line 964, in
> __do_parse_update
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> changes = self.__process_update2(table, uuid, row_update)
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> File "/usr/lib/python3/dist-packages/ovs/db/idl.py", line 991, in
> __process_update2
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> del table.rows[uuid]
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> File "/usr/lib/python3/dist-packages/ovs/db/custom_index.py", line 102, in
> __delitem__
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> index.remove(val)
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> File "/usr/lib/python3/dist-packages/ovs/db/custom_index.py", line 66, in
> remove
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> self.values.remove(self.index_entry_from_row(row))
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> File "/usr/lib/python3/dist-packages/sortedcontainers/sortedlist.py", line
> 2015, in remove
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> raise ValueError('{0!r} not in list'.format(value))
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> ValueError:
> Datapath_Binding(uuid=UUID('498e66a2-70bc-4587-a66f-0433baf82f60'),
> tunnel_key=16711683, load_balancers=[], external_ids={}) not in list
> > 2024-05-27 09:49:38.779 23596 ERROR ovsdbapp.backend.ovs_idl.connection
> >
> >
> > The complete logs showing the creation, update of the tunnel_key and
> deletion of the datapath_binding can be accessed at [1].
> >
> > Basically the problem occurs because of the tunnel_key update when we
> create a transit-switch. If the table did not have this index the problem
> would not be observed.
> >
> > This issue affects applications such as: neutron-server,
> neutron-ovn-metadata-agent, and everyone that monitors the Datapath_Binding
> table via python-idl.
> >
> > I've already talked to Ilya Maximets in the openvswitch IRC channel and
> the issue seems to be in the row updating process: python/ovs/db/idl.py.
>
>
> Thanks, Roberto! I beleive the fix I shared on IRC is mostly correct
> though
> I didn't test it. I need to refine it a little and add a unit test for the
> issue. With that I hope to post it for review somewhere soon.
>
Just to update on the patch you proposed, the deletion of the entry fails
during the python-idl update execution. The content of the table row has
already been updated just above in the __apply_diff and/or __row_update
methods. If you request to delete the entry... you will delete an entry in
use from what I understand.
The code below triggers an error when updating tunnel_key (error that
didn't happen before when updating rows):
+ del table.rows[uuid]
+ table.rows[uuid] = row
So I suggest just updating the table reference with the already updated
row. What do you think?
$ git diff
diff --git a/python/ovs/db/idl.py b/python/ovs/db/idl.py
index a80da84e7..08c5acffb 100644
--- a/python/ovs/db/idl.py
+++ b/python/ovs/db/idl.py
@@ -1014,6 +1014,7 @@ class Idl(object):
raise error.Error('Modify non-existing row')
old_row = self.__apply_diff(table, row, row_update['modify'])
+ table.rows[uuid] = row
return Notice(ROW_UPDATE, row, Row(self, table, uuid, old_row))
else:
raise error.Error('<row-update> unknown operation',
@@ -1062,6 +1063,7 @@ class Idl(object):
if op == ROW_CREATE:
table.rows[uuid] = row
if changed:
+ table.rows[uuid] = row
return Notice(op, row, Row.from_json(self, table, uuid,
old))
return False
>
> CC: Terry.
>
> Best regards, Ilya Maximets.
>
> >
> > Kind regards,
> > Roberto
> >
> >
> > [1] https://paste.openstack.org/show/bqLA7nxfk2C6loD5YlY1/
>
>
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