[openstack-dev] [Nova] Does Nova really need an SQL database?

yunhong jiang yunhong.jiang at linux.intel.com
Tue Nov 19 00:08:34 UTC 2013

On Mon, 2013-11-18 at 14:09 -0800, Joe Gordon wrote:
> Phil Day discussed this at the summit and I have finally gotten around
> to posting a POC of this. 
> https://review.openstack.org/#/c/57053/

Hi, Joe, why you think the DB is not exact state in your followed commit
message? I think the DB is updated to date by resource tracker, am I
right (the resource tracker get the underlying resource information
periodically but I think that information is mostly static). And I think
the scheduler retry mainly comes from the race condition of multiple
scheduler instance.

"We already have the concept that the DB isn't the exact state of the
world, right now it's updated every 10 seconds. And we use the scheduler
retry mechanism to handle cases where the scheduler was wrong. "

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