Comment 2 for bug 1257644

As Matt Riedemann pointed out in a duplicate bug it looks like a heartbeat issue with nova-compute

http://logs.openstack.org/04/51404/7/gate/gate-tempest-dsvm-postgres-full/b1825bf/logs/screen-n-sch.txt.gz?level=DEBUG#_2013-12-04_08_01_19_167

2013-12-04 08:01:19.167 DEBUG nova.servicegroup.drivers.db [req-9b187d9f-258f-42ef-8235-973de78a46d9 InstanceActionsV3TestXML-tempest-1651913648-user InstanceActionsV3TestXML-tempest-1651913648-tenant] DB_Driver.is_up last_heartbeat = 2013-12-04 08:01:19.008808 elapsed = 0.158322 is_up /opt/stack/new/nova/nova/servicegroup/drivers/db.py:71

A bug like this was seen before in https://review.openstack.org/#/c/46336/ https://bugs.launchpad.net/nova/+bug/1221987