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[Romil Gupta <romilg@xxxxxx>]

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

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https://bugs.launchpad.net/bugs/1426427

Title:
  Improve tunnel_sync server side rpc

Status in OpenStack Neutron (virtual network service):
  Invalid

Bug description:
  We  have a concern that we may end up with db conflict errors due to
  multiple parallel requests incoming.

  Consider two threads (A and B), each receiving tunnel_sync with host set to HOST1 and HOST2. The race scenario is:
  A checks whether tunnel exists and receives nothing.
  B checks whether tunnel exists and receives nothing.
  A adds endpoint with HOST1.
  B adds endpoint with HOST2.

  Now we have two endpoints for the same IP address with different hosts (I guess that is not what we would expect).
  I think the only way to avoid it is check for tunnel existence under the same transaction that will update it, if present. Probably meaning, making add_endpoint aware of potential tunnel existence.

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