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Re: [alto] [Cats] New draft on joint exposure of network and compute information

Jordi Ros Giralt <jros@qti.qualcomm.com> Tue, 31 October 2023 22:34 UTC

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From: Jordi Ros Giralt <jros@qti.qualcomm.com>
To: "duzongpeng@foxmail.com" <duzongpeng@foxmail.com>, cats <cats@ietf.org>, "'alto@ietf.org'" <alto@ietf.org>
Thread-Topic: [Cats] New draft on joint exposure of network and compute information
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Date: Tue, 31 Oct 2023 22:34:43 +0000
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Subject: Re: [alto] [Cats] New draft on joint exposure of network and compute information
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Thanks Zongpeng for your comments. Below my replies.

Jordi

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Hi, Jordi


Some comments about the draft for discussion.


The service instances should be deployed firstly, and then the instance selection would take place only if multiple instances exists for the client request.


    [JRG] Correct. Note also that at selection time, even if there is no service replication, the application can still benefit from exposure of communication information. For instance, if a host running an application has multiple air interfaces (5G, 4G, Wi-Fi), it can decide which one to use to connect to the service instance based on end-to-end bandwidth and latency information for each interface.



In the deployment procedure, the computer information is more detailed, and I think that only the operators that has the right are able to obtain the information.


    [JRG] In a data center, service providers can have knowledge of the available compute resources in a certain region to help them make deployment decisions. At the edge, service providers are also in need to have some level of compute information for the same reason.


The process in the Kubernets should be similar. They can manage the cloud, select a node/place, and deploy a POD.



I notice that in table 1, it says, in the service placement, service providers need compute and communication information. However, the communication information perhaps is not E2E, such as latency, unless we know where the client is connected into the network. Perhaps, it means the "as well as bandwidth capacity for forwarding the traffic generated in and out of the corresponding data center." mentioned in the first Section?


    [JRG] Correct. For the service placement case, communication refers to endpoint (and not end-to-end) metrics such as incoming/outgoing bandwidth.



In the service instance selection procedure, it can be decided in the centralized server such as the ALTO server, or in the CATS ingress. In the former case, the centralized server (decision point) can be aware of more information, e.g. multiple metrics, and make a decision. In the later case, which is called on-path decision, we perhaps need simpler metrics, which is still under working.


    [JRG] I agree.


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