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[Rodolfo Alonso <1597752@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1593719 ***
    https://bugs.launchpad.net/bugs/1593719

** This bug has been marked a duplicate of bug 1593719
   StaleDataError: DELETE statement on table 'standardattributes' expected to delete 1 row(s); 0 were matched

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https://bugs.launchpad.net/bugs/1597752

Title:
  bulk requests may fail to clean up created resources on failure

Status in neutron:
  Confirmed

Bug description:
  When creating resources in bulk (either with native ml2 support, or
  with emulated support in the base api controller), when an exception
  occurs when creating one of requested resources, an effort is made to
  clean up resources that were successfully created before the failure.

  Sadly, sometimes an exception may occur during cleanup, that will
  leave a resource in the database. For example, StaleDataError may be
  raised from SQLAlchemy, for one because of our usage of
  version_id_col; that state is fine and should be handled by retrying
  the operation, but we don't, instead we just swallow the exception and
  leave the resource to sit in the database.

  We should apply retry mechanism to the cleanup phase to avoid that
  scenario.

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