How to resolve namespace collisions in YANG models

[tokarenko]

Question
Please advise how to handle gNMI Get response parsing error caused by java.lang.IllegalStateException:

Choose suitable module name for element interfaces:
ietf-interfaces
openconfig-interfaces
     at org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream.resolveNamespace(JsonParserStream.java:395) ~[yang-data-codec-gson-14.0.11.jar:14.0.11]

The root cause is that the namespace is missing from the JSON reponse:

{
    ...
    val {
      json_val: "{\n  \"interfaces\": {\n    \"interface\": [\n ...
  }
}

json_val should start with json_val: "{\n "openconfig-interfaces:interfaces": ...

HTTP GET request is http://localhost:8888/restconf/data/network-topology:network-topology/topology=gnmi-topology/node=gnmi-simulator/yang-ext:mount/openconfig-interfaces:interfaces?content=config.

From this ODL Jira issue I realized that possible workaround is to disable/unload ietf-interfaces model from the controller.

I removed all the references to the ietf-interfaces model from the configuration but the error persisted. Then I noticed that ietf-interfaces is loaded by openconfig-interfaces and iana-if-type used by the controller: { "usedBy": "CONTROLLER", "name": "iana-if-type","revision": "2023-01-26", "nameSpace": "urn:ietf:params:xml:ns:yang:iana-if-type"}.

So, ietf-interfaces model can't be removed. Is there a way to prefer openconfig if namespaces clash?

[ihrasko]

@tokarenko I have changed the base of your PR to main. You have to downlaod your patch anew and rebase it on latest main.

Things to do:

• rebase on main
• add unit test
• please do not add additional commit which addresses PR review, instead:

git add .
git commit --amend
git push origin <yourbranch> -f

If you are able to provide unit tests your fic can be part of 22.1.0 and 21.3 release.