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[Launchpad Bug Tracker <1458913@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1458913

Title:
  haproxy-driver lock is held while gratuitous arping

Status in neutron:
  Expired

Bug description:
  https://github.com/openstack/neutron-
  lbaas/blob/b868d6d3ef0066a1ac4318d7e91b4d7a076a2e61/neutron_lbaas/drivers/haproxy/namespace_driver.py#L327

  arping can take relative long time (>2 sec), while the global lock is
  held.

  The gratuitous arping should not block other threads.

  The neutron code base already contains a `non-block` version:
  https://github.com/openstack/neutron/blob/6d2794345db2d7b12502f6e7b2d99e05a85b9030/neutron/agent/linux/ip_lib.py#L732

  Please do not increase  the lock held time by arping.
  Consider using the send_gratuitous_arp function from the ip_lib.py .

  PS.:
  The same blocking arping also re-implemented in the neutron_lbaas/drivers/haproxy/synchronous_namespace_driver.py.

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