Public bug reported:
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.
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1426427
Title:
Improve tunnel_sync server side rpc
Status in OpenStack Neutron (virtual network service):
New
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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https://bugs.launchpad.net/neutron/+bug/1426427/+subscriptions
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