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(Section 4.4) Pull/Push Modes #49

Closed boucadair closed 10 months ago

boucadair commented 11 months ago

Section 4.4 have the following, which may seem to be contradicting:

In the example shown in Figure 2, when the client sends a service request to "CATS-Forwarder 1", the forwarder solicits the C-PS to select a service contact instance hosted by a service site that can be accessed through a particular Egress CATS-Forwarder.

and

The Ingress CATS-Forwarder classifies incoming packets received from clients by soliciting the CATS classifier (C-TC). When a matching classification entry is found for the packets, the Ingress CATS-Forwarder encapsulates and forwards them to the C-PS selected Egress CATS-Forwarder.

We need to discuss if we allow both Pull/Push modes or only a mode. Then, make sure we are consistent in the doc

VMatrix1900 commented 11 months ago

I think both modes has its own merit. Pull mode is suitable for centralized C-PS and can get better overall usage result. Push mode is suitable for distributed C-PS and does not introduce the pull latency. Please see Hybrid Solution draft and its slides for detailed discussion.

muzixing commented 11 months ago

I think both modes are needed. However, in this section, I do not think the text emphasize this. It describes the processing of first packet and the following packets. so we may rephrase it as

In the example shown in Figure 2, the client sends a service access to the network though the "CATS-Forwarder 1" that is an Ingress CATS-Forwarder. Note that, a service access consists of one or more service packets. The Ingress CATS-Forwarder classifies incoming packets received from clients by the information provided by the CATS classifier (C-TC). When a matching classification entry is found for the packets, the Ingress CATS-Forwarder encapsulates and forwards them to the C-PS selected Egress CATS-Forwarder. When these packets reach the Egress CATS-Forwarder, the outer header of the possible overlay encapsulation is removed and inner packets are sent to the relevant service contact instance.

what do you think?

muzixing commented 10 months ago

This has been closed by https://github.com/boucadair/CATS-framework/pull/54