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Hi Abbass, 

I am in the process of coding some of this now - take a look at 

https://blueprints.launchpad.net/nova/+spec/extensible-resource-tracking - now has a specification document attached 
https://etherpad.openstack.org/p/IcehouseNovaExtensibleSchedulerMetrics - the design summit session on this topic

see what you think and feel free to comment - I think it covers exactly what you describe.

Paul.


Paul Murray
HP Cloud Services
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-----Original Message-----
From: Lu, Lianhao [mailto:lianhao.lu at intel.com] 
Sent: 22 November 2013 02:03
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [nova][scheduler][metrics] Additional metrics


Abbass MAROUNI wrote on 2013-11-21:
> Hello,
> 
> I'm in the process of writing a new scheduling algorithm for openstack nova.
> I have a set of compute nodes that I'm going to filter and weigh according to some metrics collected from these compute nodes.
> I saw nova.compute.resource_tracker and metrics (ram, disk and cpu) 
> that it collects from compute nodes and updates the rows corresponding to compute nodes in the database.
> 
> I'm planning to write some modules that will collect the new metrics 
> but I'm wondering if I need to modify the database schema by adding 
> more columns in the 'compute_nodes' table for my new metrics. Will 
> this require some modification to the compute model ? Then how can I use these metrics during the scheduling process, do I fetch each compute node row from the database ? Is there any easier way around this problem ?
> 
> Best Regards,

There are currently some effort on this:
https://blueprints.launchpad.net/nova/+spec/utilization-aware-scheduling
https://blueprints.launchpad.net/nova/+spec/extensible-resource-tracking 

- Lianhao


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