[Openstack] Nova and asynchronous instance launching
Jay Pipes
jaypipes at gmail.com
Thu Jun 28 16:01:50 UTC 2012
On 06/27/2012 06:51 PM, Doug Davis wrote:
> Consider the creation of a "Job" type of entity that will be returned
> from the original call - probably a 202. Then the client can check the
> Job to see how things are going.
> BTW - this pattern can be used for any async op, not just the launching
> of multiple instances since technically any op might be long-running (or
> queued) based on the current state of the system.
Note that much of the job of launching an instance is already
asynchronous -- the initial call to create an instance really just
creates an instance UUID and returns to the caller -- most of the actual
work to create the instance is then done via messaging calls and the
caller can continue to call for a status of her instance to check on it.
In this particular case, I believe Devin is referring to when you
indicate you want to spawn a whole bunch of instances and in that case,
things happen synchronously instead of asynchronously?
Devin, is that correct? If so, it seems like returning a packet
immediately that contains a list of the instance UUIDs that can be used
for checking status is the best option?
Or am I missing something here?
-jay
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