Hi, I had a question regarding the process of spawning an instance. In the whole process from requesting an instance to scheduling to spawning ,is there a queue maintained where the requests go first, like in the case of a scheduler of any OS that has a queue for jobs to be scheduled. This question arises as I wanted to look at handling multiple instance requests at a time and wanted to see if there was a common place where all the instances get registered first and get spawned after that.
I went through the code base and tried to find if there was a queue. I tried to traceback from the side of the client -> create ( in nova/api/openstack/compute/servers.py ) api server that handles all the requests ->create and _create_instance (in nova/compute/api.py) that handle all the requests regarding the compute resources. ->build_instances (nova/conductor/manager.py) handles all the db operations from here on the request is sent to the scheduler that return a host for the instance. So I'm not sure if I missed it but I was not able to find any queue where the requests are being registered. Could someone please help me understand how this works. Cheers! -- Dhvanan Shah
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