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[OpenStack Infra <1528201@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/261227
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=18e2117e3df3c119f843aed669d0c6bae9243053
Submitter: Jenkins
Branch:    master

commit 18e2117e3df3c119f843aed669d0c6bae9243053
Author: Kevin Benton <blak111@xxxxxxxxx>
Date:   Thu Dec 24 00:54:06 2015 -0800

    Call _allocate_vr_id outside of transaction
    
    _allocate_vr_id is called from _set_vr_id, which was starting a
    transaction before calling it. This caused an error when the retry
    logic was triggered inside of _allocate_vr_id since it would
    encounter a DB exception and put the transaction into a bad state
    that couldn't be used on the retry.
    
    This patch just stops _set_vr_id from starting a transaction because
    it didn't serve a purpose. It also stops _allocate_vr_id from allowing
    subtransactions when it starts a transaction, since it's retry logic
    isn't compatible with them.
    
    Co-Authored-By: Ann Kamyshnikova <akamyshnikova@xxxxxxxxxxxx>
    Closes-Bug: #1528201
    Change-Id: If7bcae39098f40f5ee9db78d3190bf9fdaf6438b


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

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https://bugs.launchpad.net/bugs/1528201

Title:
  [L3 HA] Stacktrace during HA router creation when running rally test

Status in Mirantis OpenStack:
  Confirmed
Status in neutron:
  Fix Released

Bug description:
  Rally test create_and_list_routers fails in some cases.

  Failure is caused by L3_HA_NAT_db_mixin._set_vr_id/_allocate_vr_id
  trying to reuse db session after it has been rolled back by
  DBDuplicateError exception.

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