[GitHub] [zeppelin] rickchengx commented on pull request #4174: [ZEPPELIN-5442] Allow users to set a separate namespace for the interpreter

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rickchengx commented on pull request #4174:
URL: https://github.com/apache/zeppelin/pull/4174#issuecomment-880387057


   > Feature should also be available for Zeppelin server running in K8s + CI failures.
   
   Hi, @Reamer 
   Thanks for your comment. I have fixed the CI failure.
   After my test, when zeppelin server is also running inside k8s, there'll be a few more problems:
   1. the zeppelin server needs to obtain the **cluster role** instead of role to create pods and services in other namespaces.
   2. There're 2 namespaces: the namespace of zeppelin server and the namespace of zeppelin interpreter. So the namespace return by method `getNamespace` may be wrong if we return the `zeppelin.k8s.interpreter.namespace` while zeppelin server is also running in k8s.
   3. When zeppelin server pod and interpreter pod are in different namespaces, the `ownerReference` can not be set. Since Cross-namespace owner references are disallowed by design <https://kubernetes.io/docs/concepts/workloads/controllers/garbage-collection/>.
   
   But if zeppelin server is running outside k8s, it can correctly create the interpreter pod in different namespaces. There won't be a problem of cross-namespace communication between zeppelin server and interpreter.
   
   So how about support the feature of separate namespace while zeppelin server is running in k8s in another PR.


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