Comment 7 for bug 1236704

Commenting to emphasize the need for this fix in both Grizzly and Havana. From our debugging, this isn't a database performance issue. It's making too many needless calls to the db when doing the policy checks as shown in the code snippets above. If this isn't corrected, the load on the db from a nova list or nova instance booting will make the entire cluster unresponsive.

Again, just making the db calls more efficient or improving the db isn't the complete solution. The number of db calls made needs to be drastically reduced to just the ones that make sense.