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Sandy:

I took a quick look at see how capabilities are represented and how the information flows from the ComputeManager to the ZoneManager, it looks great. I see you're using the message queue (RPC call) instead of storing the capability info in the database. Anxiously awaiting for this code to make it to the trunk 

I also see that there's a complete-looking implementation of the XenAPIConnection.get_host_stats method, but LibvirtConnection.get_host_stats is a no-op. Do you plan on implementing similar functionality for KVM (e.g., reporting memory and disk free), or will that be up to other people to get that code in there? 

Take care,

Lorin
--
Lorin Hochstein, Computer Scientist
USC Information Sciences Institute
703.812.3710
http://www.east.isi.edu/~lorin

On May 11, 2011, at 8:12 PM, Sandy Walsh wrote:

> Hey again!
> 
> dabo, sirp and myself have been working on the Distributed Scheduler branch, which does all this. 
> 
> It's a large branch, so while Ed (dabo) continues on getting things functional, myself and Rick (sirp) have started pulling chunks of code from the branch and getting smaller merge-props in. 
> 
> Expect to see the first to land, hopefully, tomorrow. This will give you a good idea of the capabilities functionality and the extension points. You can have a sneak peak at lp:~sandy-walsh/nova/dist-sched-1
> 
> Cheers,
> -S
> 
> From: Lorin Hochstein [lorin at isi.edu]
> Sent: Wednesday, May 11, 2011 1:47 PM
> To: Sandy Walsh
> Cc: Openstack
> Subject: Re: [Openstack] Zones / distributed scheduler question
> 
> Hi Sandy:
> 
> Do you know if there are there any nova branches floating out there that implement Capabilities? I've seen the following related wiki pages and blueprints, but I haven't found any implementations out there yet.
> 
> https://blueprints.launchpad.net/nova/+spec/extra-data
> https://blueprints.launchpad.net/nova/+spec/use-metadata-tags-for-capabilities
> http://wiki.openstack.org/RequestCapabilities
> 
> The zone scheduler slides mention capabilities as well, but those are at the "zone" level, and we're potentially interested in compute nodes with different capabilities within the same zone. 
> 
> (Note that for our use case, we'll probably be using flavors to specify different capabilities, so we don't (yet) need the users to be able to send arbitrary strings using the API). 
> 
> Lorin
> --
> Lorin Hochstein, Computer Scientist
> USC Information Sciences Institute
> 703.812.3710
> http://www.east.isi.edu/~lorin
> 
> On May 11, 2011, at 11:54 AM, Sandy Walsh wrote:
> 
>> Hi Lorin,
>> 
>> Zones can have multiple parents. Child Zones don't know their parents ... parents only know about children.
>> 
>> Sharing services across Zones isn't permitted (since they would need to share a DB and AMQP). 
>> 
>> You could solve the problem by using the Capabilities to determine where instances are created (GPU only or not) or create smaller sub-zones for GPU/not-GPU and let the parent zones select between them. 
>> 
>> -S
>> 
>> 
>> From: openstack-bounces+sandy.walsh=rackspace.com at lists.launchpad.net [openstack-bounces+sandy.walsh=rackspace.com at lists.launchpad.net] on behalf of Lorin Hochstein [lorin at ISI.EDU]
>> Sent: Wednesday, May 11, 2011 12:06 PM
>> To: Openstack
>> Subject: [Openstack] Zones / distributed scheduler question
>> 
>> All:
>> 
>> For the proposed zones / distributed scheduler functionality <https://blueprints.launchpad.net/nova/+spec/zones101>, can we defines  zones that overlap without being nested? 
>> 
>> Consider the scenario where: 
>> 
>> * We have two datacenters: one in Arlington, Virginia (ARL), and one in Marina del Rey, California (MDR).
>> * At each datacenter, we have both conventional x86 nodes and  nodes with GPUs 
>> 
>> Can we define our zones such that:
>> 
>> * We have a zone for each datacenter (ARL, MDR)
>> * We have a zone for GPU nodes  (GPU)
>> 
>> In this case, the GPU zone would both overlap the ARL and MDR zones, but ARL and MDR would not be fully nested within GPU. 
>> 
>> 
>> Lorin
>> --
>> Lorin Hochstein, Computer Scientist
>> USC Information Sciences Institute
>> 703.812.3710
>> http://www.east.isi.edu/~lorin
>> 
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