Comment 11 for bug 1529937

@Bogdan,

These are transactions done by two different Python processes (nova-api and neutron-server, potentially running on different nodes) talking to two different Galera servers.

1) we do not set transactions isolation level explicitly in OpenStack services - the default is used (which is REPEATABLE READ in MySQL, and we do not change it in our deployments)

2) it's simple SELECT as the transactions in neutron-server is a reader - it does not modify any rows

I believe it's simply a problem with 'casual reads', which we discuss here - http://lists.openstack.org/pipermail/openstack-dev/2016-April/093529.html