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[Rodolfo Alonso <1788556@xxxxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1788556

Title:
  dhcp agent error reading lease file

Status in neutron:
  Fix Released

Bug description:
  With a large number of VMs, at some point, the dhcp agent throws this
  index error trying to read the lease file:

  2018-08-15 16:17:40.771 40391 ERROR neutron.agent.dhcp.agent [req-cf1c7a8e-b718-4c46-b7be-999747c7e526 afe623c9e78e47febd76617008b9138e c4f22248feb9430093858a0404b779d5 - - -] Unable to reload_allocations dhcp for ef71f918-dc0d-4a6e-8d37-0f5f0720e295.: IndexError: list index out of range
  2018-08-15 16:17:40.771 40391 ERROR neutron.agent.dhcp.agent Traceback (most recent call last):
  2018-08-15 16:17:40.771 40391 ERROR neutron.agent.dhcp.agent   File "/opt/stack/venv/neutron-20180718T154642Z/lib/python2.7/site-packages/neutron/agent/dhcp/agent.py", line 142, in call_driver
  2018-08-15 16:17:40.771 40391 ERROR neutron.agent.dhcp.agent     getattr(driver, action)(**action_kwargs)
  2018-08-15 16:17:40.771 40391 ERROR neutron.agent.dhcp.agent   File "/opt/stack/venv/neutron-20180718T154642Z/lib/python2.7/site-packages/neutron/agent/linux/dhcp.py", line 512, in reload_allocations
  2018-08-15 16:17:40.771 40391 ERROR neutron.agent.dhcp.agent     self._release_unused_leases()
  2018-08-15 16:17:40.771 40391 ERROR neutron.agent.dhcp.agent   File "/opt/stack/venv/neutron-20180718T154642Z/lib/python2.7/site-packages/neutron/agent/linux/dhcp.py", line 825, in _release_unused_leases
  2018-08-15 16:17:40.771 40391 ERROR neutron.agent.dhcp.agent     v6_leases = self._read_v6_leases_file_leases(leases_filename)
  2018-08-15 16:17:40.771 40391 ERROR neutron.agent.dhcp.agent   File "/opt/stack/venv/neutron-20180718T154642Z/lib/python2.7/site-packages/neutron/agent/linux/dhcp.py", line 810, in _read_v6_leases_file_leases
  2018-08-15 16:17:40.771 40391 ERROR neutron.agent.dhcp.agent     (iaid, ip, client_id) = parts[1], parts[2], parts[4]
  2018-08-15 16:17:40.771 40391 ERROR neutron.agent.dhcp.agent IndexError: list index out of range

  When this happens, the agent calls sync_state to fully resync the
  agent state, which is a serious problem when dealing with a lot of
  ports in a scale environment.

  Is it possible to avoid a full resync of all ports?

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