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[Eugene Nikanorov <enikanorov@xxxxxxxxxxxx>]

Public bug reported:

In case network failover is turned on, remove_network_from_dhcp_agent method is a matter of concurrent execution by different neutron servers.
It then may throw unexpected DB exception, breaking network failover looping call.

Neet to make both remove_network_from_dhcp_agent and
remove_networks_from_down_agents more robust by catching broader
exception in the loop, and using safe DB delete method.

** Affects: neutron
     Importance: High
     Assignee: Eugene Nikanorov (enikanorov)
         Status: New


** Tags: l3-ipam-dhcp

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https://bugs.launchpad.net/bugs/1417629

Title:
  Make remove_network_from_dhcp_agent more robust

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  In case network failover is turned on, remove_network_from_dhcp_agent method is a matter of concurrent execution by different neutron servers.
  It then may throw unexpected DB exception, breaking network failover looping call.

  Neet to make both remove_network_from_dhcp_agent and
  remove_networks_from_down_agents more robust by catching broader
  exception in the loop, and using safe DB delete method.

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