Hi Atif,

As far as I know there are no principles defined. But,  we did some study on 
how to integrate domain orchestrators such as “Multi K8S Cluster orchestration” 
along with other domain orchestrators and also resource orchestrators.  There 
are two ways go about this.


1.      A high level service with nested services where nested services handled 
by various domain orchestrators.

2.      A service with resources where resources are handled by domain 
orchestrators.

3.      Of course, combination of both.

If you want domain orchestrator to be called from SO/MC, then (2) approach is 
needed in my view.
On (1), I don’t know whether there are any examples.
On (2), there are three examples -  Multi-Cluster (k8s) orchestration (WIP),  
Azure Orchestration and AWS Orchestration (AWS is WIP )
In all three examples of (2),  each VNF (VF) resource is treated as the 
self-contained entity.  Within Azure/AWS/Multi-Cluster orchestration, they take 
care of deploying components of VNF in various locations supported by that 
domain.  For example, Azure has lot of sites, but these are not known to the 
ONAP.  Any VNF placement in Azure sties  is the job of Azure domain 
orchestrator.

In “Multi-Cluster Orchestration” too,  our thinking is similar to Azure and 
AWS, where it acts domain orchestrator and takes care of placement decisions 
for workloads within VNF/VF.  And let the ONAP (SO/OOF) do the placement 
decisions across VNFs (in a service).

I hope it helps and request others to comment.

Thanks
Srini



From: [email protected] [mailto:[email protected]] On 
Behalf Of Husain, Atif
Sent: Monday, September 16, 2019 11:03 PM
To: [email protected]
Subject: [onap-discuss] E2E Service Orchestration by ONAP

Hi,

Are there any principles defined for ONAP related to its use for E2E Service 
Orchestration​ across multiple domains?

Regards,
Atif


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