Comment 7 for bug 1595219

I got access to an environment and it looks like the keystone/db task ran before all the database tasks were fully run so the database was not up yet when the task was run.

The detached-db database task started at
2016-06-22T16:03:28.400247+00:00 notice: (Scope(Class[Osnailyfacter::Database::Database])) MODULAR: database/database.pp
but does not complete until
2016-06-22T16:04:37.059760+00:00 notice: Finished catalog run in 64.94 seconds

Meanwhile the keystone/db task was run at...
2016-06-22T16:03:37.869731+00:00 notice: (Scope(Class[Openstack_tasks::Keystone::Db])) MODULAR: keystone/db.pp
2016-06-22T16:03:47.721773+00:00 notice: (Scope(Class[Openstack_tasks::Keystone::Db])) MODULAR: keystone/db.pp
2016-06-22T16:03:52.346289+00:00 notice: (Scope(Class[Openstack_tasks::Keystone::Db])) MODULAR: keystone/db.pp

so all retries occurred before the database was run.