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[Kevin Benton <1590602@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

The duplicate mac detection logic is based on catching DBDuplicate
exceptions at a very specific time. This results in incorrect
classification if other things are waiting to be flushed which results
in weird workarounds like
(https://review.openstack.org/#/c/292207/23/neutron/db/db_base_plugin_common.py).
It also creates different behavior if the duplicate isn't realized until
certification at COMMIT, at which point the retry decorator will restart
the operation.

** Affects: neutron
     Importance: Undecided
     Assignee: Kevin Benton (kevinbenton)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1590602

Title:
  duplicate mac detection is brittle

Status in neutron:
  In Progress

Bug description:
  The duplicate mac detection logic is based on catching DBDuplicate
  exceptions at a very specific time. This results in incorrect
  classification if other things are waiting to be flushed which results
  in weird workarounds like
  (https://review.openstack.org/#/c/292207/23/neutron/db/db_base_plugin_common.py).
  It also creates different behavior if the duplicate isn't realized
  until certification at COMMIT, at which point the retry decorator will
  restart the operation.

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