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Re: OpenStack API, Reservation ID's and Num Instances ...



If I understand the features correctly, their implementation in nova seems straightforward. However, I am still a little curious about their necessity. For load balancing, what is the difference between a single request for N instances and N requests for a single instance each?

"Sandy Walsh" <sandy.walsh@xxxxxxxxxxxxx> said:

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> Hi everyone,
> We're deep into the Zone / Distributed Scheduler merges and stumbling onto an
> interesting problem.
> EC2 API has two important concepts that I don't see in OS API (1.0 or 1.1):
> - Reservation ID
> - Number of Instances to create
> Typical use case: "Create 1000 instances". The API allocates a Reservation ID and
> all the instances are created until this ID. The ID is immediately returned to the
> user who can later query on this ID to check status.
>>From what I can see, the OS API only deals with single instance creation and
>> returns the Instance ID from the call. Both of these need to change to support
>> Reservation ID's and creating N instances. The value of the distributed scheduler
>> comes from being able to create N instances load balanced across zones.
> Anyone have any suggestions how we can support this?
> Additionally, and less important at this stage, users at the summit expressed an
> interest in being able to specify instances with something richer than Flavors. We
> have some mockups in the current host-filter code for doing this using a primitive
> little JSON grammar. So, let's assume the Flavor-like query would just be a
> string. Thoughts?
> -S
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