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[Saverio Proto <1735427@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

We are running a big production public cloud with Openstrack Newton.
However looking at the code what I show here should affect also master.

In neutron.conf we have:

rpc_response_timeout=240

we often hit Timeout in RPC method
get_devices_details_list_and_failed_devices no matter how big we set the
RPC timeout.

The problem is that when calling this function:
https://github.com/openstack/neutron/blob/5fc8e47786c91f76d253010b194bd5637de895b8/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L1514

the 'devices' argument can be very big without any limit, generating
huge RPC calls and huge database queries.

As an operator I would propose to paginate the list to break the thing
into smaller RPC calls.

Please note that `update_device_list` is also unpaginated.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1735427

Title:
  Timeout in RPC method get_devices_details_list_and_failed_devices
  cannot be fixed by increasing the timeout to infinity

Status in neutron:
  New

Bug description:
  We are running a big production public cloud with Openstrack Newton.
  However looking at the code what I show here should affect also
  master.

  In neutron.conf we have:

  rpc_response_timeout=240

  we often hit Timeout in RPC method
  get_devices_details_list_and_failed_devices no matter how big we set
  the RPC timeout.

  The problem is that when calling this function:
  https://github.com/openstack/neutron/blob/5fc8e47786c91f76d253010b194bd5637de895b8/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L1514

  the 'devices' argument can be very big without any limit, generating
  huge RPC calls and huge database queries.

  As an operator I would propose to paginate the list to break the thing
  into smaller RPC calls.

  Please note that `update_device_list` is also unpaginated.

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