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Re: Decoupling of Network and Compute services for the new Network Service design


Hi Vish,

> We need some sort of supervisor to tell the network to allocate the network before dispatching a message to compute.  I see three possibilities (from easiest to hardest):
> 1. Make the call in /nova/compute/api.py (this code runs on the api host)
> 2. Make the call in the scheduler (the scheduler then becomes sort of a supervisor to make sure all setup occurs for a vm to launch)
> 3. Create a separate compute supervisor that is responsible for managing the calls to different components
> The easiest seems to be 1, but unfortunately it forces us to wait for the network allocation to finish before returning to the user which i dislike.

What is the problem with waiting for the network allocation?  I would
imagine that will be a quick operation.  (though it would depend on
the plugin implementation)